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[dm-devel] [PATCH] scsi_dh_alua: Requeue another not ready check condition at ML

This allows the sd driver to retry commands like read capacity until a
LUN is ready, rather than giving up after three retries.

In NetApp E-Series, a controller can return not ready like this when it
quiesces I/O on the controller that just came on the network, during a
firmware upgrade procedure, and retrying the command at the midlayer
will allow the discovery to complete, successfully.

Signed-off-by: Sean Stewart <sean stewart netapp com>
 drivers/scsi/device_handler/scsi_dh_alua.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 5248c88..95d87fe 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -454,6 +454,11 @@ static int alua_check_sense(struct scsi_device *sdev,
 	switch (sense_hdr->sense_key) {
 	case NOT_READY:
+		if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
+			/*
+			 * LUN Not Ready -- In process of becoming ready
+			 */
+			return ADD_TO_MLQUEUE;
 		if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0a)
 			 * LUN Not Accessible - ALUA state transition

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