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target: Fix compare_and_write_callback handling for non GOOD status 

Following the bugfix for handling non SAM_STAT_GOOD COMPARE_AND_WRITE
status during COMMIT phase in commit 9b2792c3da, 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@datera.io>
Cc: Bill Borsari <wgb@datera.io>
Tested-by: Gary Guo <ghg@datera.io>
Cc: Gary Guo <ghg@datera.io>
Cc: <stable@vger.kernel.org> # v4.1+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2017-04-11 16:24:16 -07:00
parent fe25cc3479
commit a71a5dc7f8
1 changed files with 4 additions and 1 deletions
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5
drivers/target/target_core_sbc.c
View File

@ -507,8 +507,11 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes
* 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;
}