[PATCH] Add comment for compat_ioctl to SR

Add comment that SR doesn't support compat_ioctl (because it doesn't
pass down any driver ioctls right now)
Signed-off-by: Andi Kleen <ak@muc.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/sr.c

@@ -518,6 +518,10 @@ struct block_device_operations sr_bdops =
 	.release	= sr_block_release,
 	.ioctl		= sr_block_ioctl,
 	.media_changed	= sr_block_media_changed,
+	/* 
+	 * No compat_ioctl for now because sr_block_ioctl never
+	 * seems to pass arbitary ioctls down to host drivers.
+	 */
 };
 
 static int sr_open(struct cdrom_device_info *cdi, int purpose)