From 21879213652aca6e3fe250fc8e02c68e71c5e18a Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Sat, 18 Aug 2012 09:29:24 -0700
Subject: [PATCH] spi/mpc512x-psc: Avoid access to freed memory in device
remove function
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>
---
drivers/spi/spi-mpc512x-psc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index 4c63f772780ad..0a1e39e94d06a 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -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;
}
--
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