42a8c0a19e0947f630d71bb53db312812f
author Peter Huewe <peterhuewe@gmx.de> 1339626100 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1339632802 -0700

staging/xgifb: Add mutext for fb_mmap locking

This adds a mutex for fb_mmap around smem_start and smem_len
so the mutex inside the fb_mmap() is actually used.  Changing of
these fields before calling the framebuffer_register() are not mutexed.

We check whether framebuffer_register has been called by reading
fbinfo->count.

See 537a1bf0 - "fbdev: add mutex for fb_mmap locking" by Krzysztof Helt
for details.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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