staging/xgifb: Add mutext for fb_mmap locking

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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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Peter Huewe 2012-06-14 00:21:40 +02:00 • committed by Greg Kroah-Hartman

parent 176f7842a8

commit 95649c425f

1 changed files with 8 additions and 1 deletions

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drivers/staging/xgifb/XGI_main_26.c

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