From: Peter Huewe <peterhuewe@gmx.de>
Date: Wed, 13 Jun 2012 22:21:40 +0000 (+0200)
Subject: staging/xgifb: Add mutext for fb_mmap locking
X-Git-Tag: v3.6-rc1~100^2~785
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95649c425fa2805b76f183c27aeed93f159e47cc;p=pandora-kernel.git

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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