ide-cd: convert cdrom_decode_status() to use switch statements

Based on earlier work by Borislav Petkov.

Convert cdrom_decode_status() to use switch statements in
preparation to unify handling of fs and pc requests.

While at it:
- remove superfluous comments and do minor CodingStyle fixups

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 32 insertions, 25 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index e946f0ecbb9..43db330d7b5 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -340,15 +340,14 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                 if (blk_pc_request(rq) && !rq->errors)
                         rq->errors = SAM_STAT_CHECK_CONDITION;
 
-                /* check for tray open */
-                if (sense_key == NOT_READY) {
+                switch (sense_key) {
+                case NOT_READY:
                         cdrom_saw_media_change(drive);
-                } else if (sense_key == UNIT_ATTENTION) {
-                        /* check for media change */
+                        break;
+                case UNIT_ATTENTION:
                         cdrom_saw_media_change(drive);
                         return 0;
-                } else if (sense_key == ILLEGAL_REQUEST &&
-                           rq->cmd[0] == GPCMD_START_STOP_UNIT) {
+                case ILLEGAL_REQUEST:
                         /*
                          * Don't print error message for this condition--
                          * SFF8090i indicates that 5/24/00 is the correct
@@ -356,9 +355,13 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                          * drive doesn't have that capability.
                          * cdrom_log_sense() knows this!
                          */
-                } else if (!quiet) {
-                        /* otherwise, print an error */
-                        ide_dump_status(drive, "packet command error", stat);
+                        if (rq->cmd[0] == GPCMD_START_STOP_UNIT)
+                                break;
+                        /* fall-through */
+                default:
+                        if (!quiet)
+                                ide_dump_status(drive, "packet command error",
+                                                stat);
                 }
 
                 rq->cmd_flags |= REQ_FAILED;
@@ -378,12 +381,11 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                 if (blk_noretry_request(rq))
                         do_end_request = 1;
 
-                if (sense_key == NOT_READY) {
-                        /* tray open */
+                switch (sense_key) {
+                case NOT_READY:
                         if (rq_data_dir(rq) == READ) {
                                 cdrom_saw_media_change(drive);
 
-                                /* fail the request */
                                 if (!quiet)
                                         printk(KERN_ERR PFX "%s: tray open\n",
                                                 drive->name);
@@ -392,8 +394,8 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                                         return 1;
                         }
                         do_end_request = 1;
-                } else if (sense_key == UNIT_ATTENTION) {
-                        /* media change */
+                        break;
+                case UNIT_ATTENTION:
                         cdrom_saw_media_change(drive);
 
                         /*
@@ -402,8 +404,9 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                          */
                         if (++rq->errors > ERROR_MAX)
                                 do_end_request = 1;
-                } else if (sense_key == ILLEGAL_REQUEST ||
-                           sense_key == DATA_PROTECT) {
+                        break;
+                case ILLEGAL_REQUEST:
+                case DATA_PROTECT:
                         /*
                          * No point in retrying after an illegal request or data
                          * protect error.
@@ -411,7 +414,8 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                         if (!quiet)
                                 ide_dump_status(drive, "command error", stat);
                         do_end_request = 1;
-                } else if (sense_key == MEDIUM_ERROR) {
+                        break;
+                case MEDIUM_ERROR:
                         /*
                          * No point in re-trying a zillion times on a bad
                          * sector. If we got here the error is not correctable.
@@ -420,19 +424,22 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                                 ide_dump_status(drive, "media error "
                                                 "(bad sector)", stat);
                         do_end_request = 1;
-                } else if (sense_key == BLANK_CHECK) {
+                        break;
+                case BLANK_CHECK:
                         /* disk appears blank ?? */
                         if (!quiet)
                                 ide_dump_status(drive, "media error (blank)",
                                                 stat);
                         do_end_request = 1;
-                } else if ((err & ~ATA_ABORTED) != 0) {
-                        /* go to the default handler for other errors */
-                        ide_error(drive, "cdrom_decode_status", stat);
-                        return 1;
-                } else if ((++rq->errors > ERROR_MAX)) {
-                        /* we've racked up too many retries, abort */
-                        do_end_request = 1;
+                        break;
+                default:
+                        if (err & ~ATA_ABORTED) {
+                                /* go to the default handler for other errors */
+                                ide_error(drive, "cdrom_decode_status", stat);
+                                return 1;
+                        } else if (++rq->errors > ERROR_MAX)
+                                /* we've racked up too many retries, abort */
+                                do_end_request = 1;
                 }
 
                 /*