scsi_error: fix invalid setting of host byte

After scsi_try_to_abort_cmd returns, the eh_abort_handler may have
already found that the command has completed in the device, causing
the host_byte to be nonzero (e.g. it could be DID_ABORT).  When
this happens, ORing DID_TIME_OUT into the host byte will corrupt
the result field and initiate an unwanted command retry.

Fix this by using set_host_byte instead, following the model of
commit 2082ebc45af9c9c648383b8cde0dc1948eadbf31.

Cc: stable@vger.kernel.org
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
[Fix all instances according to review comments. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index cbe38e5e79553f66128f5daca2879fa6d1170f5f..55ecf70fe3d944ebf95af6507e41569437900c63 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -131,7 +131,7 @@ scmd_eh_abort_handler(struct work_struct *work)
                                    "aborting command %p\n", scmd));
                rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd);
                if (rtn == SUCCESS) {
-                       scmd->result |= DID_TIME_OUT << 16;
+                       set_host_byte(scmd, DID_TIME_OUT);
                        if (scsi_host_eh_past_deadline(sdev->host)) {
                                SCSI_LOG_ERROR_RECOVERY(3,
                                        scmd_printk(KERN_INFO, scmd,
@@ -167,7 +167,7 @@ scmd_eh_abort_handler(struct work_struct *work)
                        scmd_printk(KERN_WARNING, scmd,
                                    "scmd %p terminate "
                                    "aborted command\n", scmd));
-               scmd->result |= DID_TIME_OUT << 16;
+               set_host_byte(scmd, DID_TIME_OUT);
                scsi_finish_command(scmd);
        }
 }
@@ -291,7 +291,7 @@ enum blk_eh_timer_return scsi_times_out(struct request *req)
                if (scsi_abort_command(scmd) == SUCCESS)
                        return BLK_EH_NOT_HANDLED;
 
-       scmd->result |= DID_TIME_OUT << 16;
+       set_host_byte(scmd, DID_TIME_OUT);
 
        if (unlikely(rtn == BLK_EH_NOT_HANDLED &&
                     !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)))
@@ -1777,7 +1777,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
                break;
        case DID_ABORT:
                if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {
-                       scmd->result |= DID_TIME_OUT << 16;
+                       set_host_byte(scmd, DID_TIME_OUT);
                        return SUCCESS;
                }
        case DID_NO_CONNECT: