Ok, thanks for testing. Can you try the patch below? It fixes a
clear problem which was partially papered over before the commit
you bisected to, although it can't explain why blk-mq still works.
>From e4a66856fa2d92c0298000de658365f31bea60cd Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 14 Feb 2017 15:08:39 +0100
Subject: scsi: always zero sshdr in scsi_normalize_sense
This gives us a clear state even if a command didn't return sense data.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/scsi/scsi_common.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_common.c b/drivers/scsi/scsi_common.c
index b1383a71400e..a75673bb82b3 100644
--- a/drivers/scsi/scsi_common.c
+++ b/drivers/scsi/scsi_common.c
@@ -137,11 +137,11 @@ EXPORT_SYMBOL(int_to_scsilun);
bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
struct scsi_sense_hdr *sshdr)
{
+ memset(sshdr, 0, sizeof(struct scsi_sense_hdr));
+
if (!sense_buffer || !sb_len)
return false;
- memset(sshdr, 0, sizeof(struct scsi_sense_hdr));
-
sshdr->response_code = (sense_buffer[0] & 0x7f);
if (!scsi_sense_valid(sshdr))
--
2.11.0
