[PATCH 3.12 064/142] drivers: scsi: storvsc: Correctly handle TEST_UNIT_READY failure

From: Jiri Slaby
Date: Fri Sep 26 2014 - 06:27:32 EST

From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


commit 3533f8603d28b77c62d75ec899449a99bc6b77a1 upstream.

On some Windows hosts on FC SANs, TEST_UNIT_READY can return SRB_STATUS_ERROR.
Correctly handle this. Note that there is sufficient sense information to
support scsi error handling even in this case.

Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
drivers/scsi/storvsc_drv.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index b529ae8e8fff..ed0f899e8aa5 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1018,6 +1018,13 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
case ATA_12:
set_host_byte(scmnd, DID_PASSTHROUGH);
+ /*
+ * On Some Windows hosts TEST_UNIT_READY command can return
+ * SRB_STATUS_ERROR, let the upper level code deal with it
+ * based on the sense information.
+ */
+ break;
set_host_byte(scmnd, DID_TARGET_FAILURE);

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