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char: add WARN_ON() in misc_deregister()

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misc_deregister() returns an error only when it attempts to unregister
the device that is not registered. This is the driver's bug.

Most of the drivers don't check the return value of misc_deregister().
(It is not bad thing because most of kernel *_unregister() API always
succeed and do not return value)

So it is better to indicate the error by WARN_ON() in misc_deregister().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2010-08-09 17:20:35 -07:00 committed by Linus Torvalds
parent 878ae12749
commit b329becfc7
1 changed files with 1 additions and 1 deletions
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2
drivers/char/misc.c
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@ -242,7 +242,7 @@ int misc_deregister(struct miscdevice *misc)
{
int i = DYNAMIC_MINORS - misc->minor - 1;
if (list_empty(&misc->list))
if (WARN_ON(list_empty(&misc->list)))
return -EINVAL;
mutex_lock(&misc_mtx);