linux-kernel - [PATCH 2/2] Blackfin Video Driver: fix bug when opening/reading/mmaping BF54x and BF52x framebuffer simultaneously

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Message-Id: <1206580775-23929-3-git-send-email-cooloney@kernel.org>
Date:	Wed, 26 Mar 2008 18:19:35 -0700
From:	Bryan Wu <cooloney@...nel.org>
To:	linux-fbdev-devel@...ts.sourceforge.net, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Cc:	Michael Hennerich <michael.hennerich@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 2/2] Blackfin Video Driver: fix bug when opening/reading/mmaping BF54x and BF52x framebuffer simultaneously

From: Michael Hennerich <michael.hennerich@...log.com>

http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3974

opening/reading/mmaping BF54x and BF52x framebuffer simultaneously
triggers BUG: failure at mm/nommu.c:470/add_nommu_vma()
Add VM_SHARED to the default vm_flags

Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/video/bf54x-lq043fb.c    |    2 +-
 drivers/video/bfin-t350mcqb-fb.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/bf54x-lq043fb.c b/drivers/video/bf54x-lq043fb.c
index 986a550..eefba3d 100644
--- a/drivers/video/bf54x-lq043fb.c
+++ b/drivers/video/bf54x-lq043fb.c
@@ -384,7 +384,7 @@ static int bfin_bf54x_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 	 *   Other flags can be set, and are documented in
 	 *   include/linux/mm.h
 	 */
-	vma->vm_flags |= VM_MAYSHARE;
+	vma->vm_flags |=  VM_MAYSHARE | VM_SHARED;
 
 	return 0;
 }
diff --git a/drivers/video/bfin-t350mcqb-fb.c b/drivers/video/bfin-t350mcqb-fb.c
index 68d5857..c92d457 100644
--- a/drivers/video/bfin-t350mcqb-fb.c
+++ b/drivers/video/bfin-t350mcqb-fb.c
@@ -302,7 +302,7 @@ static int bfin_t350mcqb_fb_mmap(struct fb_info *info, struct vm_area_struct *vm
 	 *   Other flags can be set, and are documented in
 	 *   include/linux/mm.h
 	 */
-	vma->vm_flags |= VM_MAYSHARE;
+	vma->vm_flags |= VM_MAYSHARE | VM_SHARED;
 
 	return 0;
 }
-- 
1.5.4.3
--
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