diff options
| author | Andrea Righi <righi.andrea@gmail.com> | 2009-04-01 00:25:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 17:59:29 +0200 |
| commit | 66c1ca019078220dc1bf968f2bb18421100ef147 (patch) | |
| tree | b01d28d74bab9d9e3f0f24841a80a272d6f6520a /drivers/video/amba-clcd.c | |
| parent | cirrusfb: fix interlaced modes (diff) | |
| download | linux-66c1ca019078220dc1bf968f2bb18421100ef147.tar.xz linux-66c1ca019078220dc1bf968f2bb18421100ef147.zip | |
fbmem: fix fb_info->lock and mm->mmap_sem circular locking dependency
Fix a circular locking dependency in the frame buffer console driver
pushing down the mutex fb_info->lock.
Circular locking dependecies occur calling the blocking
fb_notifier_call_chain() with fb_info->lock held. Notifier callbacks can
try to acquire mm->mmap_sem, while fb_mmap() acquires the locks in the
reverse order mm->mmap_sem => fb_info->lock.
Tested-by: Andrey Borzenkov <arvidjaar@mail.ru>
Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/amba-clcd.c')
0 files changed, 0 insertions, 0 deletions