This is a note to let you know that I've just added the patch titled
target: Fix compare_and_write_callback handling for non GOOD status
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-fix-compare_and_write_callback-handling-for-non-good-status.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a71a5dc7f833943998e97ca8fa6a4c708a0ed1a9 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Tue, 11 Apr 2017 16:24:16 -0700
Subject: target: Fix compare_and_write_callback handling for non GOOD status
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit a71a5dc7f833943998e97ca8fa6a4c708a0ed1a9 upstream.
Following the bugfix for handling non SAM_STAT_GOOD COMPARE_AND_WRITE
status during COMMIT phase in commit 9b2792c3da1, the same bug exists
for the READ phase as well.
This would manifest first as a lost SCSI response, and eventual
hung task during fabric driver logout or re-login, as existing
shutdown logic waited for the COMPARE_AND_WRITE se_cmd->cmd_kref
to reach zero.
To address this bug, compare_and_write_callback() has been changed
to set post_ret = 1 and return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
as necessary to signal failure status.
Reported-by: Bill Borsari <wgb@xxxxxxxxx>
Cc: Bill Borsari <wgb@xxxxxxxxx>
Tested-by: Gary Guo <ghg@xxxxxxxxx>
Cc: Gary Guo <ghg@xxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_sbc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -498,8 +498,11 @@ static sense_reason_t compare_and_write_
* been failed with a non-zero SCSI status.
*/
if (cmd->scsi_status) {
- pr_err("compare_and_write_callback: non zero scsi_status:"
+ pr_debug("compare_and_write_callback: non zero scsi_status:"
" 0x%02x\n", cmd->scsi_status);
+ *post_ret = 1;
+ if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out;
}
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-4.4/target-convert-acl-change-queue_depth-se_session-reference-usage.patch
queue-4.4/target-fix-compare_and_write_callback-handling-for-non-good-status.patch
queue-4.4/target-fileio-fix-zero-length-read-and-write-handling.patch
queue-4.4/iscsi-target-set-session_fall_back_to_erl0-when-forcing-reinstatement.patch