[SCSI] scsi_dh_rdac: Retry for NOT_READY(02/04/01) in rdac device handler

During device discovery read capacity fails with 0x020401 and sets the
device size to 0. As a reason any I/O submitted to this path gets
killed at sd_prep_fn with BLKPREP_KILL. This patch is to retry for
0x020401. NEED_RETRY in scsi_decide_disposition does not give
sufficient time for the device to become ready.

Signed-off-by: Vijay Chauhan <vijay.chauhan@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 43b8c51e98d0..fd0544f7da81 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -561,6 +561,12 @@ static int rdac_check_sense(struct scsi_device *sdev,
         struct rdac_dh_data *h = get_rdac_data(sdev);
         switch (sense_hdr->sense_key) {
         case NOT_READY:
+                if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
+                        /* LUN Not Ready - Logical Unit Not Ready and is in
+                        * the process of becoming ready
+                        * Just retry.
+                        */
+                        return ADD_TO_MLQUEUE;
                 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
                         /* LUN Not Ready - Storage firmware incompatible
                          * Manual code synchonisation required.