[PATCH 11/37] scsi: ch: use 16-bits defined sense codes

[Damien Le Moal <dlemoal@kernel.org>]

Refactor the SCSI media changer driver to use the 16-bits sense_code field
of struct scsi_sense_hdr and struct scsi_failure and replace all
hard-coded additional sense codes and additional sense code qualifiers
with the enum values defined in include/scsi/scsi_sense.h. This helps with
code clarity as the sense codes being processed are easier to test and
self-documented.

No functional change intended.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/scsi/ch.c | 53 ++++++++++++++++++++---------------------------
 1 file changed, 22 insertions(+), 31 deletions(-)

diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index b804291a36ff..87e51e50a741 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -123,38 +123,32 @@ static DEFINE_IDR(ch_index_idr);
 static DEFINE_SPINLOCK(ch_index_lock);
 
 static const struct {
-	unsigned char  sense;
-	unsigned char  asc;
-	unsigned char  ascq;
-	int	       errno;
+	u8	sense_key;
+	u16	sense_code;
+	int	errno;
 } ch_err[] = {
 /* Just filled in what looks right. Hav'nt checked any standard paper for
    these errno assignments, so they may be wrong... */
 	{
-		.sense  = ILLEGAL_REQUEST,
-		.asc    = 0x21,
-		.ascq   = 0x01,
-		.errno  = EBADSLT, /* Invalid element address */
+		.sense_key	= ILLEGAL_REQUEST,
+		.sense_code	= INVALID_ELEMENT_ADDRESS,
+		.errno		= EBADSLT,
 	},{
-		.sense  = ILLEGAL_REQUEST,
-		.asc    = 0x28,
-		.ascq   = 0x01,
-		.errno  = EBADE,   /* Import or export element accessed */
+		.sense_key	= ILLEGAL_REQUEST,
+		.sense_code	= IMPORT_OR_EXPORT_ELEMENT_ACCESSED,
+		.errno		= EBADE,
 	},{
-		.sense  = ILLEGAL_REQUEST,
-		.asc    = 0x3B,
-		.ascq   = 0x0D,
-		.errno  = EXFULL,  /* Medium destination element full */
+		.sense_key	= ILLEGAL_REQUEST,
+		.sense_code	= MEDIUM_DESTINATION_ELEMENT_FULL,
+		.errno		= EXFULL,
 	},{
-		.sense  = ILLEGAL_REQUEST,
-		.asc    = 0x3B,
-		.ascq   = 0x0E,
-		.errno  = EBADE,   /* Medium source element empty */
+		.sense_key	= ILLEGAL_REQUEST,
+		.sense_code	= MEDIUM_SOURCE_ELEMENT_EMPTY,
+		.errno		= EBADE,
 	},{
-		.sense  = ILLEGAL_REQUEST,
-		.asc    = 0x20,
-		.ascq   = 0x00,
-		.errno  = EBADRQC, /* Invalid command operation code */
+		.sense_key	= ILLEGAL_REQUEST,
+		.sense_code	= INVALID_COMMAND_OP_CODE,
+		.errno		= EBADRQC,
 	},{
 	        /* end of list */
 	}
@@ -167,12 +161,10 @@ static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 	int i,errno = 0;
 
 	/* Check to see if additional sense information is available */
-	if (scsi_sense_valid(sshdr) &&
-	    sshdr->asc != 0) {
+	if (scsi_sense_valid(sshdr) && scsi_sense_asc(sshdr) != 0) {
 		for (i = 0; ch_err[i].errno != 0; i++) {
-			if (ch_err[i].sense == sshdr->sense_key &&
-			    ch_err[i].asc   == sshdr->asc &&
-			    ch_err[i].ascq  == sshdr->ascq) {
+			if (ch_err[i].sense_key == sshdr->sense_key &&
+			    ch_err[i].sense_code == sshdr->sense_code) {
 				errno = -ch_err[i].errno;
 				break;
 			}
@@ -192,8 +184,7 @@ ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
 	struct scsi_failure failure_defs[] = {
 		{
 			.sense_key = UNIT_ATTENTION,
-			.asc = SCMD_FAILURE_ASC_ANY,
-			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.sense_code = SCMD_FAILURE_SENSE_CODE_ANY,
 			.allowed = 3,
 			.result = SAM_STAT_CHECK_CONDITION,
 		},
-- 
2.55.0