[SCSI] qla4xxx: Complete the cmd if sense_len is zero

Complete the cmd if sense length is zero. For cases where sense
data spans across multiple iocb's by FW, we need to hold on to the
I/O (ha->status_srb != NULL) till we have processed them all and
copied the sense data from internal buffer to scsi_cmd sense buffer.
Signed-off-by: NPrasanna Mumbai <prasanna.mumbai@qlogic.com>
Signed-off-by: NVikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <jbottomley@parallels.com>

drivers/scsi/qla4xxx/ql4_isr.c

@@ -25,9 +25,14 @@ static void qla4xxx_copy_sense(struct scsi_qla_host *ha,
 
 	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 	sense_len = le16_to_cpu(sts_entry->senseDataByteCnt);
-	if (sense_len == 0)
+	if (sense_len == 0) {
+		DEBUG2(ql4_printk(KERN_INFO, ha, "scsi%ld:%d:%d:%d: %s:"
+				  " sense len 0\n", ha->host_no,
+				  cmd->device->channel, cmd->device->id,
+				  cmd->device->lun, __func__));
+		ha->status_srb = NULL;
 		return;
-
+	}
 	/* Save total available sense length,
 	 * not to exceed cmd's sense buffer size */
 	sense_len = min_t(uint16_t, sense_len, SCSI_SENSE_BUFFERSIZE);