From: Michael Kelley <mikelley@microsoft.com>
Date: Fri, 7 Jul 2023 21:01:26 -0700
Patch-mainline: v6.5-rc2
Subject: scsi: storvsc: Handle SRB status value 0x30
Git-commit: f4d1a8e011909fee24643f84bd1196e1366c26f2
References: git-fixes

In response to a disk I/O request, Hyper-V has been observed to return SRB
status value 0x30.  This indicates the request was not processed by Hyper-V
because low memory conditions on the host caused an internal error.  The
0x30 status is not recognized by storvsc, so the I/O operation is not
flagged as an error. The request is treated as if it completed normally but
with zero data transferred, causing a flood of retries.

Add a definition for this SRB status value and handle it like other error
statuses from the Hyper-V host.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1688788886-94279-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Olaf Hering <ohering@suse.de>
---
 drivers/scsi/storvsc_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -318,6 +318,7 @@ enum storvsc_request_type {
 #define SRB_STATUS_INVALID_REQUEST	0x06
 #define SRB_STATUS_DATA_OVERRUN		0x12
 #define SRB_STATUS_INVALID_LUN		0x20
+#define SRB_STATUS_INTERNAL_ERROR	0x30
 
 #define SRB_STATUS(status) \
 	(status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN))
@@ -978,6 +979,7 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
 	case SRB_STATUS_ERROR:
 	case SRB_STATUS_ABORTED:
 	case SRB_STATUS_INVALID_REQUEST:
+	case SRB_STATUS_INTERNAL_ERROR:
 		if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) {
 			/* Check for capacity change */
 			if ((asc == 0x2a) && (ascq == 0x9)) {