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sdio: fix reference counting in sdio_remove_func()

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sdio_remove_func() needs to be more careful about reference counting.  It
can be called in error paths where sdio_add_func() has never been called
e.g.  mmc_attach_sdio error path --> mmc_sdio_remove --> sdio_remove_func

Signed-off-by: Daniel Drake <dsd@laptop.org>
Reviewed-by: Matt Fleming <matt@console-pimps.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Drake 2009-12-17 15:27:17 -08:00 committed by Linus Torvalds
parent f6151dfea2
commit 3d10a1ba0d
1 changed files with 5 additions and 2 deletions
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7
drivers/mmc/core/sdio_bus.c
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@ -248,12 +248,15 @@ int sdio_add_func(struct sdio_func *func)
/*
* Unregister a SDIO function with the driver model, and
* (eventually) free it.
* This function can be called through error paths where sdio_add_func() was
* never executed (because a failure occurred at an earlier point).
*/
void sdio_remove_func(struct sdio_func *func)
{
if (sdio_func_present(func))
device_del(&func->dev);
if (!sdio_func_present(func))
return;
device_del(&func->dev);
put_device(&func->dev);
}