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video: fix deferred io fsync()

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If CONFIG_FB_DEFERRED_IO is set, but there are framebuffers
registered that does not make use of deferred io, then fsync()
on those framebuffers will result in a crash. Fix that.

This is needed for sh_mobile_lcdcfb since we always enable
deferred io at compile time but we may disable deferred io
for some types of hardware configurations.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2008-12-19 15:34:09 +09:00 committed by Paul Mundt
parent 0790555437
commit 87884bd8ae
1 changed files with 4 additions and 0 deletions
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4
drivers/video/fb_defio.c
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@ -60,6 +60,10 @@ int fb_deferred_io_fsync(struct file *file, struct dentry *dentry, int datasync)
{
struct fb_info *info = file->private_data;
/* Skip if deferred io is complied-in but disabled on this fbdev */
if (!info->fbdefio)
return 0;
/* Kill off the delayed work */
cancel_rearming_delayed_work(&info->deferred_work);