summaryrefslogtreecommitdiffstats
path: root/drivers/video/sa1100fb.c
diff options
context:
space:
mode:
authorAl Viro <viro@ZenIV.linux.org.uk>2009-02-16 02:38:12 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-17 14:02:08 -0800
commit1a88b5364b535edaa321d70a566e358390ff0872 (patch)
tree41c557358a595de85ba8a7a7697901ff21d1de1a /drivers/video/sa1100fb.c
parentd2f8d7ee1a9b4650b4e43325b321801264f7c37a (diff)
Fix incomplete __mntput locking
Getting this wrong caused WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2() due to optimistically checking cpu_writer->mnt outside the spinlock. Here's what we really want: * we know that nobody will set cpu_writer->mnt to mnt from now on * all changes to that sucker are done under cpu_writer->lock * we want the laziest equivalent of spin_lock(&cpu_writer->lock); if (likely(cpu_writer->mnt != mnt)) { spin_unlock(&cpu_writer->lock); continue; } /* do stuff */ that would make sure we won't miss earlier setting of ->mnt done by another CPU. Anyway, for now we just move the spin_lock() earlier and move the test into the properly locked region. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Reported-and-tested-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/sa1100fb.c')
0 files changed, 0 insertions, 0 deletions