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authorAndrea Righi <righi.andrea@gmail.com>2009-03-31 15:25:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 08:59:29 -0700
commit66c1ca019078220dc1bf968f2bb18421100ef147 (patch)
treeb01d28d74bab9d9e3f0f24841a80a272d6f6520a /include/linux/fb.h
parent8636a9240cc93efa6b36f4cfe6253e0574f832c6 (diff)
downloadlinux-linaro-stable-66c1ca019078220dc1bf968f2bb18421100ef147.tar.gz
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 'include/linux/fb.h')
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