ide-cd: fix REQ_QUIET tests in cdrom_decode_status

Original patch (dfa4411cc3a690011cab90e9a536938795366cf9) was buggy.
This is a more proper fix which introduces blk_rq_quiet() macro
alleviating the need for dumb, too short caching variables.

Thanks to Helge Deller and Bart for debugging this.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Reported-and-tested-by: Helge Deller <deller@gmx.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-cd.c

@@ -312,7 +312,6 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 	ide_hwif_t *hwif = drive->hwif;
 	struct request *rq = hwif->rq;
 	int err, sense_key, do_end_request = 0;
-	u8 quiet = rq->cmd_flags & REQ_QUIET;
 
 	/* get the IDE error register */
 	err = ide_read_error(drive);
@@ -347,7 +346,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 		} else {
 			cdrom_saw_media_change(drive);
 
-			if (blk_fs_request(rq) && !quiet)
+			if (blk_fs_request(rq) && !blk_rq_quiet(rq))
 				printk(KERN_ERR PFX "%s: tray open\n",
 					drive->name);
 		}
@@ -382,7 +381,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 		 * No point in retrying after an illegal request or data
 		 * protect error.
 		 */
-		if (!quiet)
+		if (!blk_rq_quiet(rq))
 			ide_dump_status(drive, "command error", stat);
 		do_end_request = 1;
 		break;
@@ -391,14 +390,14 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 		 * No point in re-trying a zillion times on a bad sector.
 		 * If we got here the error is not correctable.
 		 */
-		if (!quiet)
+		if (!blk_rq_quiet(rq))
 			ide_dump_status(drive, "media error "
 					"(bad sector)", stat);
 		do_end_request = 1;
 		break;
 	case BLANK_CHECK:
 		/* disk appears blank? */
-		if (!quiet)
+		if (!blk_rq_quiet(rq))
 			ide_dump_status(drive, "media error (blank)",
 					stat);
 		do_end_request = 1;

include/linux/blkdev.h

@@ -598,6 +598,7 @@ enum {
 				 blk_failfast_transport(rq) ||	\
 				 blk_failfast_driver(rq))
 #define blk_rq_started(rq)	((rq)->cmd_flags & REQ_STARTED)
+#define blk_rq_quiet(rq)	((rq)->cmd_flags & REQ_QUIET)
 
 #define blk_account_rq(rq)	(blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq)))