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video: fix deferred io fsync()
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>
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@ -60,6 +60,10 @@ int fb_deferred_io_fsync(struct file *file, struct dentry *dentry, int datasync)
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{
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struct fb_info *info = file->private_data;
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/* Skip if deferred io is complied-in but disabled on this fbdev */
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if (!info->fbdefio)
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return 0;
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/* Kill off the delayed work */
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cancel_rearming_delayed_work(&info->deferred_work);
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