* [PATCH 0/2] mmc: mxs-mmc: fix deadlocks
@ 2012-07-17 14:16 ` Lauri Hintsala
0 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-07-17 14:16 UTC (permalink / raw)
To: linux-arm-kernel
Two different deadlock fixes in cases with SDIO IRQs
generated by SDIO device.
Lauri Hintsala (2):
mmc: mxs-mmc: fix deadlock in SDIO IRQ case
mmc: mxs-mmc: fix deadlock caused by recursion loop
drivers/mmc/host/mxs-mmc.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--
1.7.9.5
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH 1/2] mmc: mxs-mmc: fix deadlock in SDIO IRQ case
2012-07-17 14:16 ` Lauri Hintsala
@ 2012-07-17 14:16 ` Lauri Hintsala
-1 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-07-17 14:16 UTC (permalink / raw)
To: Chris Ball
Cc: Shawn Guo, Marek Vasut, attila, koen.beel, Wolfram Sang,
linux-mmc, linux-arm-kernel, veli-pekka.peltola, Lauri Hintsala
Release the lock before mmc_signal_sdio_irq is called by mxs_mmc_irq_handler.
Backtrace:
[ 79.660000] =============================================
[ 79.660000] [ INFO: possible recursive locking detected ]
[ 79.660000] 3.4.0-00009-g3e96082-dirty #11 Not tainted
[ 79.660000] ---------------------------------------------
[ 79.660000] swapper/0 is trying to acquire lock:
[ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026ea3c>] mxs_mmc_enable_sdio_irq+0x18/0xd4
[ 79.660000]
[ 79.660000] but task is already holding lock:
[ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
[ 79.660000]
[ 79.660000] other info that might help us debug this:
[ 79.660000] Possible unsafe locking scenario:
[ 79.660000]
[ 79.660000] CPU0
[ 79.660000] ----
[ 79.660000] lock(&(&host->lock)->rlock#2);
[ 79.660000] lock(&(&host->lock)->rlock#2);
[ 79.660000]
[ 79.660000] *** DEADLOCK ***
[ 79.660000]
[ 79.660000] May be due to missing lock nesting notation
[ 79.660000]
[ 79.660000] 1 lock held by swapper/0:
[ 79.660000] #0: (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
[ 79.660000]
[ 79.660000] stack backtrace:
[ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c005f9c0>] (__lock_acquire+0x1948/0x1d48)
[ 79.660000] [<c005f9c0>] (__lock_acquire+0x1948/0x1d48) from [<c005fea0>] (lock_acquire+0xe0/0xf8)
[ 79.660000] [<c005fea0>] (lock_acquire+0xe0/0xf8) from [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58)
[ 79.660000] [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
[ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
[ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
[ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
[ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
[ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
[ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
[ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
[ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
[ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
[ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
[ 79.660000] BUG: spinlock lockup on CPU#0, swapper/0
[ 79.660000] lock: c398cb2c, .magic: dead4ead, .owner: swapper/0, .owner_cpu: 0
[ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144)
[ 79.660000] [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144) from [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58)
[ 79.660000] [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
[ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
[ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
[ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
[ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
[ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
[ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
[ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
[ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
[ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
[ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/mmc/host/mxs-mmc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 277161d..20a0550 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -278,11 +278,11 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
writel(stat & MXS_MMC_IRQ_BITS,
host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_CLR);
+ spin_unlock(&host->lock);
+
if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
mmc_signal_sdio_irq(host->mmc);
- spin_unlock(&host->lock);
-
if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
cmd->error = -ETIMEDOUT;
else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
--
1.7.9.5
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH 1/2] mmc: mxs-mmc: fix deadlock in SDIO IRQ case
@ 2012-07-17 14:16 ` Lauri Hintsala
0 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-07-17 14:16 UTC (permalink / raw)
To: linux-arm-kernel
Release the lock before mmc_signal_sdio_irq is called by mxs_mmc_irq_handler.
Backtrace:
[ 79.660000] =============================================
[ 79.660000] [ INFO: possible recursive locking detected ]
[ 79.660000] 3.4.0-00009-g3e96082-dirty #11 Not tainted
[ 79.660000] ---------------------------------------------
[ 79.660000] swapper/0 is trying to acquire lock:
[ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026ea3c>] mxs_mmc_enable_sdio_irq+0x18/0xd4
[ 79.660000]
[ 79.660000] but task is already holding lock:
[ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
[ 79.660000]
[ 79.660000] other info that might help us debug this:
[ 79.660000] Possible unsafe locking scenario:
[ 79.660000]
[ 79.660000] CPU0
[ 79.660000] ----
[ 79.660000] lock(&(&host->lock)->rlock#2);
[ 79.660000] lock(&(&host->lock)->rlock#2);
[ 79.660000]
[ 79.660000] *** DEADLOCK ***
[ 79.660000]
[ 79.660000] May be due to missing lock nesting notation
[ 79.660000]
[ 79.660000] 1 lock held by swapper/0:
[ 79.660000] #0: (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
[ 79.660000]
[ 79.660000] stack backtrace:
[ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c005f9c0>] (__lock_acquire+0x1948/0x1d48)
[ 79.660000] [<c005f9c0>] (__lock_acquire+0x1948/0x1d48) from [<c005fea0>] (lock_acquire+0xe0/0xf8)
[ 79.660000] [<c005fea0>] (lock_acquire+0xe0/0xf8) from [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58)
[ 79.660000] [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
[ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
[ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
[ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
[ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
[ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
[ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
[ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
[ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
[ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
[ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
[ 79.660000] BUG: spinlock lockup on CPU#0, swapper/0
[ 79.660000] lock: c398cb2c, .magic: dead4ead, .owner: swapper/0, .owner_cpu: 0
[ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144)
[ 79.660000] [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144) from [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58)
[ 79.660000] [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
[ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
[ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
[ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
[ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
[ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
[ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
[ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
[ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
[ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
[ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/mmc/host/mxs-mmc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 277161d..20a0550 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -278,11 +278,11 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
writel(stat & MXS_MMC_IRQ_BITS,
host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_CLR);
+ spin_unlock(&host->lock);
+
if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
mmc_signal_sdio_irq(host->mmc);
- spin_unlock(&host->lock);
-
if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
cmd->error = -ETIMEDOUT;
else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
--
1.7.9.5
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH 1/2] mmc: mxs-mmc: fix deadlock in SDIO IRQ case
2012-07-17 14:16 ` Lauri Hintsala
@ 2012-08-31 10:11 ` Chris Ball
-1 siblings, 0 replies; 14+ messages in thread
From: Chris Ball @ 2012-08-31 10:11 UTC (permalink / raw)
To: Lauri Hintsala
Cc: Shawn Guo, Marek Vasut, attila, koen.beel, Wolfram Sang,
linux-mmc, linux-arm-kernel, veli-pekka.peltola
Hi,
On Tue, Jul 17 2012, Lauri Hintsala wrote:
> Release the lock before mmc_signal_sdio_irq is called by mxs_mmc_irq_handler.
>
> Backtrace:
> [ 79.660000] =============================================
> [ 79.660000] [ INFO: possible recursive locking detected ]
> [ 79.660000] 3.4.0-00009-g3e96082-dirty #11 Not tainted
> [ 79.660000] ---------------------------------------------
> [ 79.660000] swapper/0 is trying to acquire lock:
> [ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026ea3c>] mxs_mmc_enable_sdio_irq+0x18/0xd4
> [ 79.660000]
> [ 79.660000] but task is already holding lock:
> [ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
> [ 79.660000]
> [ 79.660000] other info that might help us debug this:
> [ 79.660000] Possible unsafe locking scenario:
> [ 79.660000]
> [ 79.660000] CPU0
> [ 79.660000] ----
> [ 79.660000] lock(&(&host->lock)->rlock#2);
> [ 79.660000] lock(&(&host->lock)->rlock#2);
> [ 79.660000]
> [ 79.660000] *** DEADLOCK ***
> [ 79.660000]
> [ 79.660000] May be due to missing lock nesting notation
> [ 79.660000]
> [ 79.660000] 1 lock held by swapper/0:
> [ 79.660000] #0: (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
> [ 79.660000]
> [ 79.660000] stack backtrace:
> [ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c005f9c0>] (__lock_acquire+0x1948/0x1d48)
> [ 79.660000] [<c005f9c0>] (__lock_acquire+0x1948/0x1d48) from [<c005fea0>] (lock_acquire+0xe0/0xf8)
> [ 79.660000] [<c005fea0>] (lock_acquire+0xe0/0xf8) from [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58)
> [ 79.660000] [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
> [ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
> [ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
> [ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
> [ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
> [ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
> [ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
> [ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
> [ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
> [ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
> [ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
> [ 79.660000] BUG: spinlock lockup on CPU#0, swapper/0
> [ 79.660000] lock: c398cb2c, .magic: dead4ead, .owner: swapper/0, .owner_cpu: 0
> [ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144)
> [ 79.660000] [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144) from [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58)
> [ 79.660000] [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
> [ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
> [ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
> [ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
> [ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
> [ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
> [ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
> [ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
> [ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
> [ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
> [ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
>
> Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
> Acked-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> drivers/mmc/host/mxs-mmc.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
> index 277161d..20a0550 100644
> --- a/drivers/mmc/host/mxs-mmc.c
> +++ b/drivers/mmc/host/mxs-mmc.c
> @@ -278,11 +278,11 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
> writel(stat & MXS_MMC_IRQ_BITS,
> host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_CLR);
>
> + spin_unlock(&host->lock);
> +
> if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
> mmc_signal_sdio_irq(host->mmc);
>
> - spin_unlock(&host->lock);
> -
> if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
> cmd->error = -ETIMEDOUT;
> else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
Thanks, pushed to mmc-next for 3.6 with a stable@ tag.
- Chris.
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
^ permalink raw reply [flat|nested] 14+ messages in thread* [PATCH 1/2] mmc: mxs-mmc: fix deadlock in SDIO IRQ case
@ 2012-08-31 10:11 ` Chris Ball
0 siblings, 0 replies; 14+ messages in thread
From: Chris Ball @ 2012-08-31 10:11 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
On Tue, Jul 17 2012, Lauri Hintsala wrote:
> Release the lock before mmc_signal_sdio_irq is called by mxs_mmc_irq_handler.
>
> Backtrace:
> [ 79.660000] =============================================
> [ 79.660000] [ INFO: possible recursive locking detected ]
> [ 79.660000] 3.4.0-00009-g3e96082-dirty #11 Not tainted
> [ 79.660000] ---------------------------------------------
> [ 79.660000] swapper/0 is trying to acquire lock:
> [ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026ea3c>] mxs_mmc_enable_sdio_irq+0x18/0xd4
> [ 79.660000]
> [ 79.660000] but task is already holding lock:
> [ 79.660000] (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
> [ 79.660000]
> [ 79.660000] other info that might help us debug this:
> [ 79.660000] Possible unsafe locking scenario:
> [ 79.660000]
> [ 79.660000] CPU0
> [ 79.660000] ----
> [ 79.660000] lock(&(&host->lock)->rlock#2);
> [ 79.660000] lock(&(&host->lock)->rlock#2);
> [ 79.660000]
> [ 79.660000] *** DEADLOCK ***
> [ 79.660000]
> [ 79.660000] May be due to missing lock nesting notation
> [ 79.660000]
> [ 79.660000] 1 lock held by swapper/0:
> [ 79.660000] #0: (&(&host->lock)->rlock#2){-.....}, at: [<c026f744>] mxs_mmc_irq_handler+0x1c/0xe8
> [ 79.660000]
> [ 79.660000] stack backtrace:
> [ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c005f9c0>] (__lock_acquire+0x1948/0x1d48)
> [ 79.660000] [<c005f9c0>] (__lock_acquire+0x1948/0x1d48) from [<c005fea0>] (lock_acquire+0xe0/0xf8)
> [ 79.660000] [<c005fea0>] (lock_acquire+0xe0/0xf8) from [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58)
> [ 79.660000] [<c03a8460>] (_raw_spin_lock_irqsave+0x44/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
> [ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
> [ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
> [ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
> [ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
> [ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
> [ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
> [ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
> [ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
> [ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
> [ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
> [ 79.660000] BUG: spinlock lockup on CPU#0, swapper/0
> [ 79.660000] lock: c398cb2c, .magic: dead4ead, .owner: swapper/0, .owner_cpu: 0
> [ 79.660000] [<c0014bd0>] (unwind_backtrace+0x0/0xf4) from [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144)
> [ 79.660000] [<c01ddb1c>] (do_raw_spin_lock+0xf0/0x144) from [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58)
> [ 79.660000] [<c03a8468>] (_raw_spin_lock_irqsave+0x4c/0x58) from [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4)
> [ 79.660000] [<c026ea3c>] (mxs_mmc_enable_sdio_irq+0x18/0xd4) from [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8)
> [ 79.660000] [<c026f7fc>] (mxs_mmc_irq_handler+0xd4/0xe8) from [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254)
> [ 79.660000] [<c006bdd8>] (handle_irq_event_percpu+0x70/0x254) from [<c006bff8>] (handle_irq_event+0x3c/0x5c)
> [ 79.660000] [<c006bff8>] (handle_irq_event+0x3c/0x5c) from [<c006e6d0>] (handle_level_irq+0x90/0x110)
> [ 79.660000] [<c006e6d0>] (handle_level_irq+0x90/0x110) from [<c006b930>] (generic_handle_irq+0x38/0x50)
> [ 79.660000] [<c006b930>] (generic_handle_irq+0x38/0x50) from [<c00102fc>] (handle_IRQ+0x30/0x84)
> [ 79.660000] [<c00102fc>] (handle_IRQ+0x30/0x84) from [<c000f058>] (__irq_svc+0x38/0x60)
> [ 79.660000] [<c000f058>] (__irq_svc+0x38/0x60) from [<c0010520>] (default_idle+0x2c/0x40)
> [ 79.660000] [<c0010520>] (default_idle+0x2c/0x40) from [<c0010a90>] (cpu_idle+0x64/0xcc)
> [ 79.660000] [<c0010a90>] (cpu_idle+0x64/0xcc) from [<c04ff858>] (start_kernel+0x244/0x2c8)
>
> Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
> Acked-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> drivers/mmc/host/mxs-mmc.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
> index 277161d..20a0550 100644
> --- a/drivers/mmc/host/mxs-mmc.c
> +++ b/drivers/mmc/host/mxs-mmc.c
> @@ -278,11 +278,11 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
> writel(stat & MXS_MMC_IRQ_BITS,
> host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_CLR);
>
> + spin_unlock(&host->lock);
> +
> if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
> mmc_signal_sdio_irq(host->mmc);
>
> - spin_unlock(&host->lock);
> -
> if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
> cmd->error = -ETIMEDOUT;
> else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
Thanks, pushed to mmc-next for 3.6 with a stable@ tag.
- Chris.
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH 2/2] mmc: mxs-mmc: fix deadlock caused by recursion loop
2012-07-17 14:16 ` Lauri Hintsala
@ 2012-07-17 14:16 ` Lauri Hintsala
-1 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-07-17 14:16 UTC (permalink / raw)
To: Chris Ball
Cc: Shawn Guo, Marek Vasut, attila, koen.beel, Wolfram Sang,
linux-mmc, linux-arm-kernel, veli-pekka.peltola, Lauri Hintsala
Release the lock before mmc_signal_sdio_irq is called by
mxs_mmc_enable_sdio_irq.
Backtrace:
[ 65.470000] =============================================
[ 65.470000] [ INFO: possible recursive locking detected ]
[ 65.470000] 3.5.0-rc5 #2 Not tainted
[ 65.470000] ---------------------------------------------
[ 65.470000] ksdioirqd/mmc0/73 is trying to acquire lock:
[ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
[ 65.470000]
[ 65.470000] but task is already holding lock:
[ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
[ 65.470000]
[ 65.470000] other info that might help us debug this:
[ 65.470000] Possible unsafe locking scenario:
[ 65.470000]
[ 65.470000] CPU0
[ 65.470000] ----
[ 65.470000] lock(&(&host->lock)->rlock#2);
[ 65.470000] lock(&(&host->lock)->rlock#2);
[ 65.470000]
[ 65.470000] *** DEADLOCK ***
[ 65.470000]
[ 65.470000] May be due to missing lock nesting notation
[ 65.470000]
[ 65.470000] 1 lock held by ksdioirqd/mmc0/73:
[ 65.470000] #0: (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
[ 65.470000]
[ 65.470000] stack backtrace:
[ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98)
[ 65.470000] [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98) from [<c005d3f8>] (lock_acquire+0xa0/0x108)
[ 65.470000] [<c005d3f8>] (lock_acquire+0xa0/0x108) from [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c)
[ 65.470000] [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
[ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
[ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
[ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
[ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
[ 65.470000] BUG: spinlock lockup suspected on CPU#0, ksdioirqd/mmc0/73
[ 65.470000] lock: 0xc3358724, .magic: dead4ead, .owner: ksdioirqd/mmc0/73, .owner_cpu: 0
[ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c01b46b0>] (do_raw_spin_lock+0x100/0x144)
[ 65.470000] [<c01b46b0>] (do_raw_spin_lock+0x100/0x144) from [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c)
[ 65.470000] [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
[ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
[ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
[ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
[ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
Reported-by: Attila Kinali <attila@kinali.ch>
Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/mmc/host/mxs-mmc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 20a0550..e1fd2c8 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -637,11 +637,6 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_SET);
-
- if (readl(host->base + HW_SSP_STATUS(host)) &
- BM_SSP_STATUS_SDIO_IRQ)
- mmc_signal_sdio_irq(host->mmc);
-
} else {
writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
@@ -650,6 +645,11 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
}
spin_unlock_irqrestore(&host->lock, flags);
+
+ if (enable && readl(host->base + HW_SSP_STATUS(host)) &
+ BM_SSP_STATUS_SDIO_IRQ)
+ mmc_signal_sdio_irq(host->mmc);
+
}
static const struct mmc_host_ops mxs_mmc_ops = {
--
1.7.9.5
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH 2/2] mmc: mxs-mmc: fix deadlock caused by recursion loop
@ 2012-07-17 14:16 ` Lauri Hintsala
0 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-07-17 14:16 UTC (permalink / raw)
To: linux-arm-kernel
Release the lock before mmc_signal_sdio_irq is called by
mxs_mmc_enable_sdio_irq.
Backtrace:
[ 65.470000] =============================================
[ 65.470000] [ INFO: possible recursive locking detected ]
[ 65.470000] 3.5.0-rc5 #2 Not tainted
[ 65.470000] ---------------------------------------------
[ 65.470000] ksdioirqd/mmc0/73 is trying to acquire lock:
[ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
[ 65.470000]
[ 65.470000] but task is already holding lock:
[ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
[ 65.470000]
[ 65.470000] other info that might help us debug this:
[ 65.470000] Possible unsafe locking scenario:
[ 65.470000]
[ 65.470000] CPU0
[ 65.470000] ----
[ 65.470000] lock(&(&host->lock)->rlock#2);
[ 65.470000] lock(&(&host->lock)->rlock#2);
[ 65.470000]
[ 65.470000] *** DEADLOCK ***
[ 65.470000]
[ 65.470000] May be due to missing lock nesting notation
[ 65.470000]
[ 65.470000] 1 lock held by ksdioirqd/mmc0/73:
[ 65.470000] #0: (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
[ 65.470000]
[ 65.470000] stack backtrace:
[ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98)
[ 65.470000] [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98) from [<c005d3f8>] (lock_acquire+0xa0/0x108)
[ 65.470000] [<c005d3f8>] (lock_acquire+0xa0/0x108) from [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c)
[ 65.470000] [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
[ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
[ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
[ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
[ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
[ 65.470000] BUG: spinlock lockup suspected on CPU#0, ksdioirqd/mmc0/73
[ 65.470000] lock: 0xc3358724, .magic: dead4ead, .owner: ksdioirqd/mmc0/73, .owner_cpu: 0
[ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c01b46b0>] (do_raw_spin_lock+0x100/0x144)
[ 65.470000] [<c01b46b0>] (do_raw_spin_lock+0x100/0x144) from [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c)
[ 65.470000] [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
[ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
[ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
[ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
[ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
Reported-by: Attila Kinali <attila@kinali.ch>
Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/mmc/host/mxs-mmc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 20a0550..e1fd2c8 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -637,11 +637,6 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_SET);
-
- if (readl(host->base + HW_SSP_STATUS(host)) &
- BM_SSP_STATUS_SDIO_IRQ)
- mmc_signal_sdio_irq(host->mmc);
-
} else {
writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
@@ -650,6 +645,11 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
}
spin_unlock_irqrestore(&host->lock, flags);
+
+ if (enable && readl(host->base + HW_SSP_STATUS(host)) &
+ BM_SSP_STATUS_SDIO_IRQ)
+ mmc_signal_sdio_irq(host->mmc);
+
}
static const struct mmc_host_ops mxs_mmc_ops = {
--
1.7.9.5
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH 2/2] mmc: mxs-mmc: fix deadlock caused by recursion loop
2012-07-17 14:16 ` Lauri Hintsala
@ 2012-08-31 10:12 ` Chris Ball
-1 siblings, 0 replies; 14+ messages in thread
From: Chris Ball @ 2012-08-31 10:12 UTC (permalink / raw)
To: Lauri Hintsala
Cc: Shawn Guo, Marek Vasut, attila, koen.beel, Wolfram Sang,
linux-mmc, linux-arm-kernel, veli-pekka.peltola
Hi,
On Tue, Jul 17 2012, Lauri Hintsala wrote:
> Release the lock before mmc_signal_sdio_irq is called by
> mxs_mmc_enable_sdio_irq.
>
> Backtrace:
> [ 65.470000] =============================================
> [ 65.470000] [ INFO: possible recursive locking detected ]
> [ 65.470000] 3.5.0-rc5 #2 Not tainted
> [ 65.470000] ---------------------------------------------
> [ 65.470000] ksdioirqd/mmc0/73 is trying to acquire lock:
> [ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
> [ 65.470000]
> [ 65.470000] but task is already holding lock:
> [ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
> [ 65.470000]
> [ 65.470000] other info that might help us debug this:
> [ 65.470000] Possible unsafe locking scenario:
> [ 65.470000]
> [ 65.470000] CPU0
> [ 65.470000] ----
> [ 65.470000] lock(&(&host->lock)->rlock#2);
> [ 65.470000] lock(&(&host->lock)->rlock#2);
> [ 65.470000]
> [ 65.470000] *** DEADLOCK ***
> [ 65.470000]
> [ 65.470000] May be due to missing lock nesting notation
> [ 65.470000]
> [ 65.470000] 1 lock held by ksdioirqd/mmc0/73:
> [ 65.470000] #0: (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
> [ 65.470000]
> [ 65.470000] stack backtrace:
> [ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98)
> [ 65.470000] [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98) from [<c005d3f8>] (lock_acquire+0xa0/0x108)
> [ 65.470000] [<c005d3f8>] (lock_acquire+0xa0/0x108) from [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c)
> [ 65.470000] [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
> [ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
> [ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
> [ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
> [ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
> [ 65.470000] BUG: spinlock lockup suspected on CPU#0, ksdioirqd/mmc0/73
> [ 65.470000] lock: 0xc3358724, .magic: dead4ead, .owner: ksdioirqd/mmc0/73, .owner_cpu: 0
> [ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c01b46b0>] (do_raw_spin_lock+0x100/0x144)
> [ 65.470000] [<c01b46b0>] (do_raw_spin_lock+0x100/0x144) from [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c)
> [ 65.470000] [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
> [ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
> [ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
> [ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
> [ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
>
> Reported-by: Attila Kinali <attila@kinali.ch>
> Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
> Acked-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> drivers/mmc/host/mxs-mmc.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
> index 20a0550..e1fd2c8 100644
> --- a/drivers/mmc/host/mxs-mmc.c
> +++ b/drivers/mmc/host/mxs-mmc.c
> @@ -637,11 +637,6 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
> writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
> host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_SET);
> -
> - if (readl(host->base + HW_SSP_STATUS(host)) &
> - BM_SSP_STATUS_SDIO_IRQ)
> - mmc_signal_sdio_irq(host->mmc);
> -
> } else {
> writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
> host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
> @@ -650,6 +645,11 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> }
>
> spin_unlock_irqrestore(&host->lock, flags);
> +
> + if (enable && readl(host->base + HW_SSP_STATUS(host)) &
> + BM_SSP_STATUS_SDIO_IRQ)
> + mmc_signal_sdio_irq(host->mmc);
> +
> }
>
> static const struct mmc_host_ops mxs_mmc_ops = {
Thanks, pushed to mmc-next for 3.6 with a stable@ tag.
- Chris.
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
^ permalink raw reply [flat|nested] 14+ messages in thread* [PATCH 2/2] mmc: mxs-mmc: fix deadlock caused by recursion loop
@ 2012-08-31 10:12 ` Chris Ball
0 siblings, 0 replies; 14+ messages in thread
From: Chris Ball @ 2012-08-31 10:12 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
On Tue, Jul 17 2012, Lauri Hintsala wrote:
> Release the lock before mmc_signal_sdio_irq is called by
> mxs_mmc_enable_sdio_irq.
>
> Backtrace:
> [ 65.470000] =============================================
> [ 65.470000] [ INFO: possible recursive locking detected ]
> [ 65.470000] 3.5.0-rc5 #2 Not tainted
> [ 65.470000] ---------------------------------------------
> [ 65.470000] ksdioirqd/mmc0/73 is trying to acquire lock:
> [ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
> [ 65.470000]
> [ 65.470000] but task is already holding lock:
> [ 65.470000] (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
> [ 65.470000]
> [ 65.470000] other info that might help us debug this:
> [ 65.470000] Possible unsafe locking scenario:
> [ 65.470000]
> [ 65.470000] CPU0
> [ 65.470000] ----
> [ 65.470000] lock(&(&host->lock)->rlock#2);
> [ 65.470000] lock(&(&host->lock)->rlock#2);
> [ 65.470000]
> [ 65.470000] *** DEADLOCK ***
> [ 65.470000]
> [ 65.470000] May be due to missing lock nesting notation
> [ 65.470000]
> [ 65.470000] 1 lock held by ksdioirqd/mmc0/73:
> [ 65.470000] #0: (&(&host->lock)->rlock#2){-.-...}, at: [<bf054120>] mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]
> [ 65.470000]
> [ 65.470000] stack backtrace:
> [ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98)
> [ 65.470000] [<c005ccb8>] (__lock_acquire+0x14f8/0x1b98) from [<c005d3f8>] (lock_acquire+0xa0/0x108)
> [ 65.470000] [<c005d3f8>] (lock_acquire+0xa0/0x108) from [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c)
> [ 65.470000] [<c02f671c>] (_raw_spin_lock_irqsave+0x48/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
> [ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
> [ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
> [ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
> [ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
> [ 65.470000] BUG: spinlock lockup suspected on CPU#0, ksdioirqd/mmc0/73
> [ 65.470000] lock: 0xc3358724, .magic: dead4ead, .owner: ksdioirqd/mmc0/73, .owner_cpu: 0
> [ 65.470000] [<c0014990>] (unwind_backtrace+0x0/0xf4) from [<c01b46b0>] (do_raw_spin_lock+0x100/0x144)
> [ 65.470000] [<c01b46b0>] (do_raw_spin_lock+0x100/0x144) from [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c)
> [ 65.470000] [<c02f6724>] (_raw_spin_lock_irqsave+0x50/0x5c) from [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc])
> [ 65.470000] [<bf054120>] (mxs_mmc_enable_sdio_irq+0x18/0xdc [mxs_mmc]) from [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc])
> [ 65.470000] [<bf0541d0>] (mxs_mmc_enable_sdio_irq+0xc8/0xdc [mxs_mmc]) from [<c0219b38>] (sdio_irq_thread+0x1bc/0x274)
> [ 65.470000] [<c0219b38>] (sdio_irq_thread+0x1bc/0x274) from [<c003c324>] (kthread+0x8c/0x98)
> [ 65.470000] [<c003c324>] (kthread+0x8c/0x98) from [<c00101ac>] (kernel_thread_exit+0x0/0x8)
>
> Reported-by: Attila Kinali <attila@kinali.ch>
> Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
> Acked-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> drivers/mmc/host/mxs-mmc.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
> index 20a0550..e1fd2c8 100644
> --- a/drivers/mmc/host/mxs-mmc.c
> +++ b/drivers/mmc/host/mxs-mmc.c
> @@ -637,11 +637,6 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
> writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
> host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_SET);
> -
> - if (readl(host->base + HW_SSP_STATUS(host)) &
> - BM_SSP_STATUS_SDIO_IRQ)
> - mmc_signal_sdio_irq(host->mmc);
> -
> } else {
> writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
> host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
> @@ -650,6 +645,11 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> }
>
> spin_unlock_irqrestore(&host->lock, flags);
> +
> + if (enable && readl(host->base + HW_SSP_STATUS(host)) &
> + BM_SSP_STATUS_SDIO_IRQ)
> + mmc_signal_sdio_irq(host->mmc);
> +
> }
>
> static const struct mmc_host_ops mxs_mmc_ops = {
Thanks, pushed to mmc-next for 3.6 with a stable@ tag.
- Chris.
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 0/2] mmc: mxs-mmc: fix deadlocks
2012-07-17 14:16 ` Lauri Hintsala
@ 2012-08-28 8:08 ` Lauri Hintsala
-1 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-08-28 8:08 UTC (permalink / raw)
To: Chris Ball
Cc: Marek Vasut, linux-mmc, koen.beel, Wolfram Sang, attila,
Lauri Hintsala, veli-pekka.peltola, Shawn Guo, linux-arm-kernel
On 07/17/2012 05:16 PM, Lauri Hintsala wrote:
> Two different deadlock fixes in cases with SDIO IRQs
> generated by SDIO device.
Any comments? Could they be applied?
BR,
Lauri
> Lauri Hintsala (2):
> mmc: mxs-mmc: fix deadlock in SDIO IRQ case
> mmc: mxs-mmc: fix deadlock caused by recursion loop
>
> drivers/mmc/host/mxs-mmc.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH 0/2] mmc: mxs-mmc: fix deadlocks
@ 2012-08-28 8:08 ` Lauri Hintsala
0 siblings, 0 replies; 14+ messages in thread
From: Lauri Hintsala @ 2012-08-28 8:08 UTC (permalink / raw)
To: linux-arm-kernel
On 07/17/2012 05:16 PM, Lauri Hintsala wrote:
> Two different deadlock fixes in cases with SDIO IRQs
> generated by SDIO device.
Any comments? Could they be applied?
BR,
Lauri
> Lauri Hintsala (2):
> mmc: mxs-mmc: fix deadlock in SDIO IRQ case
> mmc: mxs-mmc: fix deadlock caused by recursion loop
>
> drivers/mmc/host/mxs-mmc.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 0/2] mmc: mxs-mmc: fix deadlocks
2012-08-28 8:08 ` Lauri Hintsala
@ 2012-08-30 21:05 ` Shawn Guo
-1 siblings, 0 replies; 14+ messages in thread
From: Shawn Guo @ 2012-08-30 21:05 UTC (permalink / raw)
To: Chris Ball, Lauri Hintsala
Cc: Marek Vasut, attila, koen.beel, Wolfram Sang, linux-mmc,
linux-arm-kernel, veli-pekka.peltola
On Tue, Aug 28, 2012 at 11:08:24AM +0300, Lauri Hintsala wrote:
> On 07/17/2012 05:16 PM, Lauri Hintsala wrote:
> >Two different deadlock fixes in cases with SDIO IRQs
> >generated by SDIO device.
>
> Any comments? Could they be applied?
>
Chris, can you please send these two fixes for 3.6? Also, stable
should be Cc-ed.
--
Regards,
Shawn
^ permalink raw reply [flat|nested] 14+ messages in thread