[PATCH] scsi_io_completion sense copy

For the flush generated requests, we don't have room for sense info right
now.  This might change in the future so that the sd end_io function can
make a better judgement on what to do about an error.  So check this in
scsi_io_completion(), only copy sense data to request if it has space
assigned to it.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/scsi/scsi_lib.c

@@ -726,7 +726,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes,
 		req->errors = result;
 		if (result) {
 			clear_errors = 0;
-			if (sense_valid) {
+			if (sense_valid && req->sense) {
 				/*
 				 * SG_IO wants current and deferred errors
 				 */