linux-kernel - [PATCH 4.20 75/76] scsi: core: reset host byte in DID_NEXUS

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Message-Id: <20190308124917.446036003@linuxfoundation.org>
Date:   Fri,  8 Mar 2019 13:50:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martin Wilck <mwilck@...e.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.20 75/76] scsi: core: reset host byte in DID_NEXUS_FAILURE case

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

------------------

From: Martin Wilck <mwilck@...e.com>

commit 4a067cf823d9d8e50d41cfb618011c0d4a969c72 upstream.

Up to 4.12, __scsi_error_from_host_byte() would reset the host byte to
DID_OK for various cases including DID_NEXUS_FAILURE.  Commit
2a842acab109 ("block: introduce new block status code type") replaced this
function with scsi_result_to_blk_status() and removed the host-byte
resetting code for the DID_NEXUS_FAILURE case.  As the line
set_host_byte(cmd, DID_OK) was preserved for the other cases, I suppose
this was an editing mistake.

The fact that the host byte remains set after 4.13 is causing problems with
the sg_persist tool, which now returns success rather then exit status 24
when a RESERVATION CONFLICT error is encountered.

Fixes: 2a842acab109 "block: introduce new block status code type"
Signed-off-by: Martin Wilck <mwilck@...e.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/scsi_lib.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -757,6 +757,7 @@ static blk_status_t scsi_result_to_blk_s
 		set_host_byte(cmd, DID_OK);
 		return BLK_STS_TARGET;
 	case DID_NEXUS_FAILURE:
+		set_host_byte(cmd, DID_OK);
 		return BLK_STS_NEXUS;
 	case DID_ALLOC_FAILURE:
 		set_host_byte(cmd, DID_OK);