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spi/mpc512x-psc: Avoid access to freed memory in device remove function

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The call to spi_unregister_master() in the device remove function frees device
memory, and with it any device local data. However, device local data is still
accessed after the call to spi_unregister_master().

Acquire a reference to the SPI master device and release it after cleanup is
complete to solve the problem.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Guenter Roeck 2012-08-18 09:29:24 -07:00 committed by Mark Brown
parent c8c87c656f
commit 2187921365
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi-mpc512x-psc.c
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@ -494,7 +494,7 @@ static int __devinit mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
static int __devexit mpc512x_psc_spi_do_remove(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
struct mpc512x_psc_spi *mps = spi_master_get_devdata(master);
flush_workqueue(mps->workqueue);
@ -503,6 +503,7 @@ static int __devexit mpc512x_psc_spi_do_remove(struct device *dev)
free_irq(mps->irq, mps);
if (mps->psc)
iounmap(mps->psc);
spi_master_put(master);
return 0;
}