From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Jassi Brar <jassisinghbrar@gmail.com>,
Vinod Koul <vinod.koul@linux.intel.com>,
Tomasz Figa <t.figa@samsung.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [ 18/18] drivers/dma/pl330.c: fix locking in pl330_free_chan_resources()
Date: Thu, 18 Jul 2013 19:23:33 -0700 [thread overview]
Message-ID: <20130719021050.204528358@linuxfoundation.org> (raw)
In-Reply-To: <20130719021048.965829361@linuxfoundation.org>
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
commit da331ba8e9c5de72a27e50f71105395bba6eebe0 upstream.
tasklet_kill() may sleep so call it before taking pch->lock.
Fixes following lockup:
BUG: scheduling while atomic: cat/2383/0x00000002
Modules linked in:
unwind_backtrace+0x0/0xfc
__schedule_bug+0x4c/0x58
__schedule+0x690/0x6e0
sys_sched_yield+0x70/0x78
tasklet_kill+0x34/0x8c
pl330_free_chan_resources+0x24/0x88
dma_chan_put+0x4c/0x50
[...]
BUG: spinlock lockup suspected on CPU#0, swapper/0/0
lock: 0xe52aa04c, .magic: dead4ead, .owner: cat/2383, .owner_cpu: 1
unwind_backtrace+0x0/0xfc
do_raw_spin_lock+0x194/0x204
_raw_spin_lock_irqsave+0x20/0x28
pl330_tasklet+0x2c/0x5a8
tasklet_action+0xfc/0x114
__do_softirq+0xe4/0x19c
irq_exit+0x98/0x9c
handle_IPI+0x124/0x16c
gic_handle_irq+0x64/0x68
__irq_svc+0x40/0x70
cpuidle_wrap_enter+0x4c/0xa0
cpuidle_enter_state+0x18/0x68
cpuidle_idle_call+0xac/0xe0
cpu_idle+0xac/0xf0
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Cc: Vinod Koul <vinod.koul@linux.intel.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/dma/pl330.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -281,10 +281,10 @@ static void pl330_free_chan_resources(st
struct dma_pl330_chan *pch = to_pchan(chan);
unsigned long flags;
- spin_lock_irqsave(&pch->lock, flags);
-
tasklet_kill(&pch->task);
+ spin_lock_irqsave(&pch->lock, flags);
+
pl330_release_channel(pch->pl330_chid);
pch->pl330_chid = NULL;
next prev parent reply other threads:[~2013-07-19 2:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-19 2:23 [ 00/18] 3.0.87-stable review Greg Kroah-Hartman
2013-07-19 2:23 ` [ 01/18] jbd2: fix theoretical race in jbd2__journal_restart Greg Kroah-Hartman
2013-07-19 2:23 ` [ 02/18] ext3,ext4: dont mess with dir_file->f_pos in htree_dirblock_to_tree() Greg Kroah-Hartman
2013-07-19 2:23 ` [ 03/18] USB: option,qcserial: move Novatel Gobi1K IDs to qcserial Greg Kroah-Hartman
2013-07-19 2:23 ` [ 04/18] usb: gadget: f_mass_storage: add missing memory barrier for thread_wakeup_needed Greg Kroah-Hartman
2013-07-19 2:23 ` [ 05/18] xhci: check for failed dma pool allocation Greg Kroah-Hartman
2013-07-19 2:23 ` [ 06/18] pcmcia: at91_cf: fix gpio_get_value in at91_cf_get_status Greg Kroah-Hartman
2013-07-19 2:23 ` [ 07/18] xen/time: remove blocked time accounting from xen "clockchip" Greg Kroah-Hartman
2013-07-19 2:23 ` [ 08/18] genirq: Fix can_request_irq() for IRQs without an action Greg Kroah-Hartman
2013-07-19 2:23 ` [ 09/18] drivers/rtc/rtc-rv3029c2.c: fix disabling AIE irq Greg Kroah-Hartman
2013-07-19 2:23 ` [ 10/18] ACPI / EC: Add HP Folio 13 to ec_dmi_table in order to skip DSDT scan Greg Kroah-Hartman
2013-07-22 16:13 ` Luis Henriques
2013-07-23 4:21 ` Ben Hutchings
2013-07-23 10:57 ` Rafael J. Wysocki
2013-07-19 2:23 ` [ 11/18] ocfs2: xattr: fix inlined xattr reflink Greg Kroah-Hartman
2013-07-19 2:23 ` [ 12/18] ahci: Add AMD CZ SATA device ID Greg Kroah-Hartman
2013-07-19 2:23 ` [ 13/18] ahci: remove pmp link online check in FBS EH Greg Kroah-Hartman
2013-07-19 2:23 ` [ 14/18] timer: Fix jiffies wrap behavior of round_jiffies_common() Greg Kroah-Hartman
2013-07-19 2:23 ` [ 15/18] ext4: fix data offset overflow in ext4_xattr_fiemap() on 32-bit archs Greg Kroah-Hartman
2013-07-19 2:23 ` [ 16/18] ext4: fix overflow when counting used blocks on 32-bit architectures Greg Kroah-Hartman
2013-07-19 2:23 ` [ 17/18] ARM: 7765/1: perf: Record the user-mode PC in the call chain Greg Kroah-Hartman
2013-07-19 2:23 ` Greg Kroah-Hartman [this message]
2013-07-19 23:57 ` [ 00/18] 3.0.87-stable review Shuah Khan
2013-07-21 2:02 ` Satoru Takeuchi
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