scsi: stop decoding if scsi_normalize_sense() fails

If scsi_normalize_sense() fails we couldn't decode the sense
buffer, and the scsi_sense_hdr fields are invalid.
For those cases we should rather dump the sense buffer
and not try to decode invalid fields.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/constants.c

@@ -1436,14 +1436,10 @@ scsi_print_sense_hdr(const struct scsi_device *sdev, const char *name,
 EXPORT_SYMBOL(scsi_print_sense_hdr);
 
 static void
-scsi_decode_sense_buffer(const unsigned char *sense_buffer, int sense_len,
-		       struct scsi_sense_hdr *sshdr)
+scsi_dump_sense_buffer(const unsigned char *sense_buffer, int sense_len)
 {
-	int k, num, res;
+	int k, num;
 
-	res = scsi_normalize_sense(sense_buffer, sense_len, sshdr);
-	if (0 == res) {
-		/* this may be SCSI-1 sense data */
 	num = (sense_len < 32) ? sense_len : 32;
 	printk("Unrecognized sense data (in hex):");
 	for (k = 0; k < num; ++k) {
@@ -1455,7 +1451,6 @@ scsi_decode_sense_buffer(const unsigned char *sense_buffer, int sense_len,
 	}
 	printk("\n");
 	return;
-	}
 }
 
 static void
@@ -1525,7 +1520,10 @@ void __scsi_print_sense(const struct scsi_device *sdev, const char *name,
 {
 	struct scsi_sense_hdr sshdr;
 
-	scsi_decode_sense_buffer(sense_buffer, sense_len, &sshdr);
+	if (!scsi_normalize_sense(sense_buffer, sense_len, &sshdr)) {
+		scsi_dump_sense_buffer(sense_buffer, sense_len);
+		return;
+	}
 	scsi_show_sense_hdr(sdev, name, &sshdr);
 	scsi_decode_sense_extras(sense_buffer, sense_len, &sshdr);
 	scsi_show_extd_sense(sdev, name, sshdr.asc, sshdr.ascq);