video: fix deferred io fsync()

From: Magnus Damm <[email protected]>

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.

---

 drivers/video/fb_defio.c |    4 ++++
 1 file changed, 4 insertions(+)

@@ -60,6 +60,10 @@ int fb_deferred_io_fsync(struct file *fi
 {
 	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);
 

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