This patch is to add retry for mode select if mode select command is returned with sense key NO_SENSE,
ABORTED_COMMAND, UNIT_ATTENTION or NOT_READY(02/04/01). This patch reorganise the sense from
if-else to switch-case format in scsi_dh_rdac.c for better maintainability.
Signed-off-by: Vijay Chauhan <vijay.chauhan@xxxxxxx>
---
--- linux-2.6.29-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c.orig 2009-02-24 12:08:43.000000000 +0530
+++ linux-2.6.29-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c 2009-02-28 18:18:41.000000000 +0530
@@ -449,28 +449,40 @@ static int mode_select_handle_sense(stru
unsigned char *sensebuf)
{
struct scsi_sense_hdr sense_hdr;
- int sense, err = SCSI_DH_IO, ret;
+ int err = SCSI_DH_IO, ret;
ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
if (!ret)
goto done;
err = SCSI_DH_OK;
- sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
- sense_hdr.ascq;
- /* If it is retryable failure, submit the c9 inquiry again */
- if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
- sense == 0x62900) {
- /* 0x59136 - Command lock contention
- * 0x[6b]8b02 - Quiesense in progress or achieved
- * 0x62900 - Power On, Reset, or Bus Device Reset
- */
+
+ switch (sense_hdr.sense_key) {
+ case NO_SENSE:
+ case ABORTED_COMMAND:
+ case UNIT_ATTENTION:
+ err = SCSI_DH_RETRY;
+ break;
+ case NOT_READY:
+ if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
+ /* LUN Not Ready and is in the Process
+ * of becoming ready
+ */
+ err = SCSI_DH_RETRY;
+ break;
+ case ILLEGAL_REQUEST:
+ if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
+ /*
+ * Command Lock contention
+ */
err = SCSI_DH_RETRY;
+ break;
+ default:
+ sdev_printk(KERN_INFO, sdev,
+ "MODE_SELECT failed with sense %02x/%02x/%02x.\n",
+ sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
}
- if (sense)
- sdev_printk(KERN_INFO, sdev,
- "MODE_SELECT failed with sense 0x%x.\n", sense);
done:
return err;
}
----
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