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mmc: cd-gpio: protect against NULL context in mmc_cd_gpio_free() 

Do not oops, even if mmc_cd_gpio_free() is mistakenly called on a driver
cleanup path, even though a previous call to mmc_cd_gpio_request() failed.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
[stable@: please apply to 3.3-stable]
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2012-04-24 17:56:29 +02:00 committed by Chris Ball
parent 0dd1bfeb6c
commit 0e9f480bb5
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/core/cd-gpio.c
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@ -73,6 +73,9 @@ void mmc_cd_gpio_free(struct mmc_host *host)
{
struct mmc_cd_gpio *cd = host->hotplug.handler_priv;
if (!cd)
return;
free_irq(host->hotplug.irq, host);
gpio_free(cd->gpio);
kfree(cd);