[PATCH 1/2] spi: spi-coldfire-qspi: Drop extra spi_master_put in device remove function

[PATCH 1/2] spi: spi-coldfire-qspi: Drop extra spi_master_put in device remove function

[Guenter Roeck]

The call sequence spi_alloc_master/spi_register_master/spi_unregister_master is
complete; it reduces the device reference count to zero, which and results in
device memory being freed. The subsequent call to spi_master_put is unnecessary
and results in an access to free memory. Drop it.

Signed-off-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
---
 drivers/spi/spi-coldfire-qspi.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/spi/spi-coldfire-qspi.c b/drivers/spi/spi-coldfire-qspi.c
index b2d4b9e..1a30b47 100644
--- a/drivers/spi/spi-coldfire-qspi.c
+++ b/drivers/spi/spi-coldfire-qspi.c
@@ -533,7 +533,6 @@ static int __devexit mcfqspi_remove(struct platform_device *pdev)
 	iounmap(mcfqspi->iobase);
 	release_mem_region(res->start, resource_size(res));
 	spi_unregister_master(master);
-	spi_master_put(master);
 
 	return 0;
 }
-- 
1.7.9.7


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[PATCH 2/2] spi/coldfire-qspi: Drop extra calls to spi_master_get in suspend/resume functions

[Guenter Roeck]

Suspend and resume functions call spi_master_get() without matching
spi_master_put(). The extra references are unnecessary and cause
subsequent module unload attempts to fail, so drop the calls.

Signed-off-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
---
 drivers/spi/spi-coldfire-qspi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-coldfire-qspi.c b/drivers/spi/spi-coldfire-qspi.c
index 1a30b47..764bfee 100644
--- a/drivers/spi/spi-coldfire-qspi.c
+++ b/drivers/spi/spi-coldfire-qspi.c
@@ -540,7 +540,7 @@ static int __devexit mcfqspi_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int mcfqspi_suspend(struct device *dev)
 {
-	struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
+	struct spi_master *master = dev_get_drvdata(dev);
 	struct mcfqspi *mcfqspi = spi_master_get_devdata(master);
 
 	spi_master_suspend(master);
@@ -552,7 +552,7 @@ static int mcfqspi_suspend(struct device *dev)
 
 static int mcfqspi_resume(struct device *dev)
 {
-	struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
+	struct spi_master *master = dev_get_drvdata(dev);
 	struct mcfqspi *mcfqspi = spi_master_get_devdata(master);
 
 	spi_master_resume(master);
-- 
1.7.9.7


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threat landscape has changed and how IT managers can respond. Discussions 
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Re: [PATCH 1/2] spi: spi-coldfire-qspi: Drop extra spi_master_put in device remove function

[Mark Brown]

On Thu, Aug 16, 2012 at 08:25:59PM -0700, Guenter Roeck wrote:
> The call sequence spi_alloc_master/spi_register_master/spi_unregister_master is
> complete; it reduces the device reference count to zero, which and results in
> device memory being freed. The subsequent call to spi_master_put is unnecessary
> and results in an access to free memory. Drop it.

Applied both, thanks.

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Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/