[PATCH v3 0/2] spi: dw: bug fix and clean up series

[PATCH v3 0/2] spi: dw: bug fix and clean up series

[Andy Shevchenko]

The first patch is a regression fix, second one a little fix(no need to
backport). The rest, that has been already applied, is clean up part, in
particularly follow up to what previously Jarkko started.

The driver has been tested on Intel MID platform in DMA and PIO modes.

Changelog v3:
- send with cover letter
- call free_irq() at the end of removal to keep the same flow we have at error
  path

Changelog v2:
- drop applied patches
- address Mark's comment regarding to free IRQ

Andy Shevchenko (2):
  spi: dw: explicitly free IRQ handler in dw_spi_remove_host()
  spi: dw: remove a NULL check when call ->remove()

 drivers/spi/spi-dw.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

-- 
2.6.1

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[PATCH v3 1/2] spi: dw: explicitly free IRQ handler in dw_spi_remove_host()

[Andy Shevchenko]

The following warning occurs when DW SPI is compiled as a module and it's a PCI
device. On the removal stage pcibios_free_irq() is called earlier than
free_irq() due to the latter is called at managed resources free strage.

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1003 at /home/andy/prj/linux/fs/proc/generic.c:575 remove_proc_entry+0x118/0x150()
remove_proc_entry: removing non-empty directory 'irq/38', leaking at least 'dw_spi1'
Modules linked in: spi_dw_midpci(-) spi_dw [last unloaded: dw_dmac_core]
CPU: 1 PID: 1003 Comm: modprobe Not tainted 4.3.0-rc5-next-20151013+ #32
 00000000 00000000 f5535d70 c12dc220 f5535db0 f5535da0 c104e912 c198a6bc
 f5535dcc 000003eb c198a638 0000023f c11b4098 c11b4098 f54f1ec8 f54f1ea0
 f642ba20 f5535db8 c104e96e 00000009 f5535db0 c198a6bc f5535dcc f5535df0
Call Trace:
 [<c12dc220>] dump_stack+0x41/0x61
 [<c104e912>] warn_slowpath_common+0x82/0xb0
 [<c11b4098>] ? remove_proc_entry+0x118/0x150
 [<c11b4098>] ? remove_proc_entry+0x118/0x150
 [<c104e96e>] warn_slowpath_fmt+0x2e/0x30
 [<c11b4098>] remove_proc_entry+0x118/0x150
 [<c109b96a>] unregister_irq_proc+0xaa/0xc0
 [<c109575e>] free_desc+0x1e/0x60
 [<c10957d2>] irq_free_descs+0x32/0x70
 [<c109b1a0>] irq_domain_free_irqs+0x120/0x150
 [<c1039e8c>] mp_unmap_irq+0x5c/0x60
 [<c16277b0>] intel_mid_pci_irq_disable+0x20/0x40
 [<c1627c7f>] pcibios_free_irq+0xf/0x20
 [<c13189f2>] pci_device_remove+0x52/0xb0
 [<c13f6367>] __device_release_driver+0x77/0x100
 [<c13f6da7>] driver_detach+0x87/0x90
 [<c13f5eaa>] bus_remove_driver+0x4a/0xc0
 [<c128bf0d>] ? selinux_capable+0xd/0x10
 [<c13f7483>] driver_unregister+0x23/0x60
 [<c10bad8a>] ? find_module_all+0x5a/0x80
 [<c1317413>] pci_unregister_driver+0x13/0x60
 [<f80ac654>] dw_spi_driver_exit+0xd/0xf [spi_dw_midpci]
 [<c10bce9a>] SyS_delete_module+0x17a/0x210

Explicitly call free_irq() at removal stage of the DW SPI driver.

Fixes: 04f421e7b0b1 (spi: dw: use managed resources)
Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/spi/spi-dw.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index a730c35..221ff97 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -486,8 +486,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
 	snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num);
 
-	ret = devm_request_irq(dev, dws->irq, dw_spi_irq, IRQF_SHARED,
-			dws->name, master);
+	ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dws->name, master);
 	if (ret < 0) {
 		dev_err(dev, "can not get IRQ\n");
 		goto err_free_master;
@@ -532,6 +531,7 @@ err_dma_exit:
 	if (dws->dma_ops && dws->dma_ops->dma_exit)
 		dws->dma_ops->dma_exit(dws);
 	spi_enable_chip(dws, 0);
+	free_irq(dws->irq, master);
 err_free_master:
 	spi_master_put(master);
 	return ret;
@@ -548,6 +548,8 @@ void dw_spi_remove_host(struct dw_spi *dws)
 		dws->dma_ops->dma_exit(dws);
 
 	spi_shutdown_chip(dws);
+
+	free_irq(dws->irq, dws->master);
 }
 EXPORT_SYMBOL_GPL(dw_spi_remove_host);
 
-- 
2.6.1

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[PATCH v3 2/2] spi: dw: remove a NULL check when call ->remove()

[Andy Shevchenko]

Currently all users aware about calling dw_spi_remove_host() with properly set
parameter. Remove unneeded check.

Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/spi/spi-dw.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 221ff97..cc2e980 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -540,8 +540,6 @@ EXPORT_SYMBOL_GPL(dw_spi_add_host);
 
 void dw_spi_remove_host(struct dw_spi *dws)
 {
-	if (!dws)
-		return;
 	dw_spi_debugfs_remove(dws);
 
 	if (dws->dma_ops && dws->dma_ops->dma_exit)
-- 
2.6.1

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Applied "spi: dw: remove a NULL check when call ->remove()" to the spi tree

[Mark Brown]

The patch

   spi: dw: remove a NULL check when call ->remove()

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From f4aaa1c8a5c0e0a3fc565360df83965f3918c874 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Date: Tue, 20 Oct 2015 12:11:41 +0300
Subject: [PATCH] spi: dw: remove a NULL check when call ->remove()

Currently all users aware about calling dw_spi_remove_host() with properly set
parameter. Remove unneeded check.

Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-dw.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 221ff97557a3..cc2e98037afd 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -540,8 +540,6 @@ EXPORT_SYMBOL_GPL(dw_spi_add_host);
 
 void dw_spi_remove_host(struct dw_spi *dws)
 {
-	if (!dws)
-		return;
 	dw_spi_debugfs_remove(dws);
 
 	if (dws->dma_ops && dws->dma_ops->dma_exit)
-- 
2.6.1

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Applied "spi: dw: explicitly free IRQ handler in dw_spi_remove_host()" to the spi tree

[Mark Brown]

The patch

   spi: dw: explicitly free IRQ handler in dw_spi_remove_host()

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 02f20387e1bca550639c37b1945f20cd32ddfcce Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Date: Tue, 20 Oct 2015 12:11:40 +0300
Subject: [PATCH] spi: dw: explicitly free IRQ handler in dw_spi_remove_host()

The following warning occurs when DW SPI is compiled as a module and it's a PCI
device. On the removal stage pcibios_free_irq() is called earlier than
free_irq() due to the latter is called at managed resources free strage.

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1003 at /home/andy/prj/linux/fs/proc/generic.c:575 remove_proc_entry+0x118/0x150()
remove_proc_entry: removing non-empty directory 'irq/38', leaking at least 'dw_spi1'
Modules linked in: spi_dw_midpci(-) spi_dw [last unloaded: dw_dmac_core]
CPU: 1 PID: 1003 Comm: modprobe Not tainted 4.3.0-rc5-next-20151013+ #32
 00000000 00000000 f5535d70 c12dc220 f5535db0 f5535da0 c104e912 c198a6bc
 f5535dcc 000003eb c198a638 0000023f c11b4098 c11b4098 f54f1ec8 f54f1ea0
 f642ba20 f5535db8 c104e96e 00000009 f5535db0 c198a6bc f5535dcc f5535df0
Call Trace:
 [<c12dc220>] dump_stack+0x41/0x61
 [<c104e912>] warn_slowpath_common+0x82/0xb0
 [<c11b4098>] ? remove_proc_entry+0x118/0x150
 [<c11b4098>] ? remove_proc_entry+0x118/0x150
 [<c104e96e>] warn_slowpath_fmt+0x2e/0x30
 [<c11b4098>] remove_proc_entry+0x118/0x150
 [<c109b96a>] unregister_irq_proc+0xaa/0xc0
 [<c109575e>] free_desc+0x1e/0x60
 [<c10957d2>] irq_free_descs+0x32/0x70
 [<c109b1a0>] irq_domain_free_irqs+0x120/0x150
 [<c1039e8c>] mp_unmap_irq+0x5c/0x60
 [<c16277b0>] intel_mid_pci_irq_disable+0x20/0x40
 [<c1627c7f>] pcibios_free_irq+0xf/0x20
 [<c13189f2>] pci_device_remove+0x52/0xb0
 [<c13f6367>] __device_release_driver+0x77/0x100
 [<c13f6da7>] driver_detach+0x87/0x90
 [<c13f5eaa>] bus_remove_driver+0x4a/0xc0
 [<c128bf0d>] ? selinux_capable+0xd/0x10
 [<c13f7483>] driver_unregister+0x23/0x60
 [<c10bad8a>] ? find_module_all+0x5a/0x80
 [<c1317413>] pci_unregister_driver+0x13/0x60
 [<f80ac654>] dw_spi_driver_exit+0xd/0xf [spi_dw_midpci]
 [<c10bce9a>] SyS_delete_module+0x17a/0x210

Explicitly call free_irq() at removal stage of the DW SPI driver.

Fixes: 04f421e7b0b1 (spi: dw: use managed resources)
Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-dw.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index a730c353d3bf..221ff97557a3 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -486,8 +486,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
 	snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num);
 
-	ret = devm_request_irq(dev, dws->irq, dw_spi_irq, IRQF_SHARED,
-			dws->name, master);
+	ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dws->name, master);
 	if (ret < 0) {
 		dev_err(dev, "can not get IRQ\n");
 		goto err_free_master;
@@ -532,6 +531,7 @@ err_dma_exit:
 	if (dws->dma_ops && dws->dma_ops->dma_exit)
 		dws->dma_ops->dma_exit(dws);
 	spi_enable_chip(dws, 0);
+	free_irq(dws->irq, master);
 err_free_master:
 	spi_master_put(master);
 	return ret;
@@ -548,6 +548,8 @@ void dw_spi_remove_host(struct dw_spi *dws)
 		dws->dma_ops->dma_exit(dws);
 
 	spi_shutdown_chip(dws);
+
+	free_irq(dws->irq, dws->master);
 }
 EXPORT_SYMBOL_GPL(dw_spi_remove_host);
 
-- 
2.6.1

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