[SCSI] Generate uevents on certain unit attention codes

[karo-tx-linux.git] / drivers / scsi / scsi_error.c

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index a46c3dddcf70c212948a41b1cbebdc21aae06df2..83e591b60193f6cfcd3ae934df9db829cc60bb22 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -223,6 +223,74 @@ static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
 }
 #endif
 
+ /**
+ * scsi_report_lun_change - Set flag on all *other* devices on the same target
+ *                          to indicate that a UNIT ATTENTION is expected.
+ * @sdev:      Device reporting the UNIT ATTENTION
+ */
+static void scsi_report_lun_change(struct scsi_device *sdev)
+{
+       sdev->sdev_target->expecting_lun_change = 1;
+}
+
+/**
+ * scsi_report_sense - Examine scsi sense information and log messages for
+ *                    certain conditions, also issue uevents for some of them.
+ * @sdev:      Device reporting the sense code
+ * @sshdr:     sshdr to be examined
+ */
+static void scsi_report_sense(struct scsi_device *sdev,
+                             struct scsi_sense_hdr *sshdr)
+{
+       enum scsi_device_event evt_type = SDEV_EVT_MAXBITS;     /* i.e. none */
+
+       if (sshdr->sense_key == UNIT_ATTENTION) {
+               if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) {
+                       evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED;
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Inquiry data has changed");
+               } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) {
+                       evt_type = SDEV_EVT_LUN_CHANGE_REPORTED;
+                       scsi_report_lun_change(sdev);
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Warning! Received an indication that the "
+                                   "LUN assignments on this target have "
+                                   "changed. The Linux SCSI layer does not "
+                                   "automatically remap LUN assignments.\n");
+               } else if (sshdr->asc == 0x3f)
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Warning! Received an indication that the "
+                                   "operating parameters on this target have "
+                                   "changed. The Linux SCSI layer does not "
+                                   "automatically adjust these parameters.\n");
+
+               if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) {
+                       evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED;
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Warning! Received an indication that the "
+                                   "LUN reached a thin provisioning soft "
+                                   "threshold.\n");
+               }
+
+               if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) {
+                       evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED;
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Mode parameters changed");
+               } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) {
+                       evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED;
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Capacity data has changed");
+               } else if (sshdr->asc == 0x2a)
+                       sdev_printk(KERN_WARNING, sdev,
+                                   "Parameters changed");
+       }
+
+       if (evt_type != SDEV_EVT_MAXBITS) {
+               set_bit(evt_type, sdev->pending_events);
+               schedule_work(&sdev->event_work);
+       }
+}
+
 /**
  * scsi_check_sense - Examine scsi cmd sense
  * @scmd:      Cmd to have sense checked.
@@ -250,6 +318,8 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
                 */
                return SUCCESS;
 
+       scsi_report_sense(sdev, &sshdr);
+
        if (scsi_sense_is_deferred(&sshdr))
                return NEEDS_RETRY;
 
@@ -314,6 +384,14 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
                                return NEEDS_RETRY;
                        }
                }
+               /*
+                * we might also expect a cc/ua if another LUN on the target
+                * reported a UA with an ASC/ASCQ of 3F 0E -
+                * REPORTED LUNS DATA HAS CHANGED.
+                */
+               if (scmd->device->sdev_target->expecting_lun_change &&
+                   sshdr.asc == 0x3f && sshdr.ascq == 0x0e)
+                       return NEEDS_RETRY;
                /*
                 * if the device is in the process of becoming ready, we
                 * should retry.
@@ -327,26 +405,6 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
                if (scmd->device->allow_restart &&
                    (sshdr.asc == 0x04) && (sshdr.ascq == 0x02))
                        return FAILED;
-
-               if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e)
-                       scmd_printk(KERN_WARNING, scmd,
-                                   "Warning! Received an indication that the "
-                                   "LUN assignments on this target have "
-                                   "changed. The Linux SCSI layer does not "
-                                   "automatically remap LUN assignments.\n");
-               else if (sshdr.asc == 0x3f)
-                       scmd_printk(KERN_WARNING, scmd,
-                                   "Warning! Received an indication that the "
-                                   "operating parameters on this target have "
-                                   "changed. The Linux SCSI layer does not "
-                                   "automatically adjust these parameters.\n");
-
-               if (sshdr.asc == 0x38 && sshdr.ascq == 0x07)
-                       scmd_printk(KERN_WARNING, scmd,
-                                   "Warning! Received an indication that the "
-                                   "LUN reached a thin provisioning soft "
-                                   "threshold.\n");
-
                /*
                 * Pass the UA upwards for a determination in the completion
                 * functions.
@@ -1574,6 +1632,8 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
                 */
                return ADD_TO_MLQUEUE;
        case GOOD:
+               if (scmd->cmnd[0] == REPORT_LUNS)
+                       scmd->device->sdev_target->expecting_lun_change = 0;
                scsi_handle_queue_ramp_up(scmd->device);
        case COMMAND_TERMINATED:
                return SUCCESS;