diff mbox series

[v2,6/9] ide-cd: Remove redundant sense buffer

Message ID 20180731195155.46664-7-keescook@chromium.org (mailing list archive)
State Not Applicable
Headers show
Series block: Consolidate scsi sense buffer usage | expand

Commit Message

Kees Cook July 31, 2018, 7:51 p.m. UTC 
This is already able to process the sense buffer, so remove the redundant
parsing during the failure path. This also fixes any possible stale values
since the prior code did not check the sense length.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/ide/ide-cd.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Comments

David Miller July 31, 2018, 9:30 p.m. UTC | #1 
From: Kees Cook <keescook@chromium.org>
Date: Tue, 31 Jul 2018 12:51:51 -0700

> This is already able to process the sense buffer, so remove the redundant
> parsing during the failure path. This also fixes any possible stale values
> since the prior code did not check the sense length.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Acked-by: David S. Miller <davem@davemloft.net>
Christoph Hellwig Aug. 1, 2018, 8:23 a.m. UTC | #2 
On Tue, Jul 31, 2018 at 12:51:51PM -0700, Kees Cook wrote:
> This is already able to process the sense buffer, so remove the redundant
> parsing during the failure path. This also fixes any possible stale values
> since the prior code did not check the sense length.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index cb90560acf6e..023a7d94eb08 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -423,6 +423,7 @@  int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 		    req_flags_t rq_flags)
 {
 	struct cdrom_info *info = drive->driver_data;
+	struct scsi_sense_hdr local_sshdr;
 	int retries = 10;
 	bool failed;
 
@@ -430,6 +431,9 @@  int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 				  "rq_flags: 0x%x",
 				  cmd[0], write, timeout, rq_flags);
 
+	if (!sshdr)
+		sshdr = &local_sshdr;
+
 	/* start of retry loop */
 	do {
 		struct request *rq;
@@ -456,9 +460,8 @@  int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 
 		if (buffer)
 			*bufflen = scsi_req(rq)->resid_len;
-		if (sshdr)
-			scsi_normalize_sense(scsi_req(rq)->sense,
-					     scsi_req(rq)->sense_len, sshdr);
+		scsi_normalize_sense(scsi_req(rq)->sense,
+				     scsi_req(rq)->sense_len, sshdr);
 
 		/*
 		 * FIXME: we should probably abort/retry or something in case of
@@ -470,12 +473,10 @@  int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
 			 * The request failed.  Retry if it was due to a unit
 			 * attention status (usually means media was changed).
 			 */
-			struct request_sense *reqbuf = scsi_req(rq)->sense;
-
-			if (reqbuf->sense_key == UNIT_ATTENTION)
+			if (sshdr->sense_key == UNIT_ATTENTION)
 				cdrom_saw_media_change(drive);
-			else if (reqbuf->sense_key == NOT_READY &&
-				 reqbuf->asc == 4 && reqbuf->ascq != 4) {
+			else if (sshdr->sense_key == NOT_READY &&
+				 sshdr->asc == 4 && sshdr->ascq != 4) {
 				/*
 				 * The drive is in the process of loading
 				 * a disk.  Retry, but wait a little to give