From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Thu, 9 May 2013 18:03:33 +0000 (-0300)
Subject: [media] videobuf_vm_{open,close} race fixes
X-Git-Tag: v3.11-rc1~17^2~344
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a242f426108c284049a69710f871cc9f11b13e61;p=pandora-kernel.git

[media] videobuf_vm_{open,close} race fixes

just use videobuf_queue_lock(map->q) to protect map->count; vm_area_operations
->open() and ->close() are called just under vma->vm_mm->mmap_sem, which
doesn't help the drivers at all, since clonal VMAs are normally in different
address spaces...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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