diff options
| author |   Hannes Reinecke <hare@suse.de> | 2017-04-06 15:36:35 +0200 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2017-04-06 13:07:33 -0400 |
| commit | a06586325f371c0f0f6095454b5beca0602eaab4 (patch) | |
| tree | e87937fc00ab8e22047df50090686f55731d3940 /Documentation/scsi | |
| parent | scsi: make scsi_eh_scmd_add() always succeed (diff) | |
| download | linux-dev-a06586325f371c0f0f6095454b5beca0602eaab4.tar.xz linux-dev-a06586325f371c0f0f6095454b5beca0602eaab4.zip | |
scsi: make asynchronous aborts mandatory
There hasn't been any reports for HBAs where asynchronous abort
would not work, so we should make it mandatory and remove
the fallback.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation/scsi')
| -rw-r--r-- | Documentation/scsi/scsi_eh.txt | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/Documentation/scsi/scsi_eh.txt b/Documentation/scsi/scsi_eh.txt index 4edb9c1cbef5..11e447bdb3a5 100644 --- a/Documentation/scsi/scsi_eh.txt +++ b/Documentation/scsi/scsi_eh.txt @@ -70,7 +70,7 @@ with the command. scmd is requeued to blk queue. - otherwise - scsi_eh_scmd_add(scmd, 0) is invoked for the command. See + scsi_eh_scmd_add(scmd) is invoked for the command. See [1-3] for details of this function. @@ -103,9 +103,7 @@ function eh_timed_out() callback did not handle the command. Step #2 is taken. - 2. If the host supports asynchronous completion (as indicated by the - no_async_abort setting in the host template) scsi_abort_command() - is invoked to schedule an asynchrous abort. + 2. scsi_abort_command() is invoked to schedule an asynchrous abort. Asynchronous abort are not invoked for commands which the SCSI_EH_ABORT_SCHEDULED flag is set (this indicates that the command already had been aborted once, and this is a retry which failed), @@ -127,16 +125,13 @@ function scmds enter EH via scsi_eh_scmd_add(), which does the following. - 1. Turns on scmd->eh_eflags as requested. It's 0 for error - completions and SCSI_EH_CANCEL_CMD for timeouts. + 1. Links scmd->eh_entry to shost->eh_cmd_q - 2. Links scmd->eh_entry to shost->eh_cmd_q + 2. Sets SHOST_RECOVERY bit in shost->shost_state - 3. Sets SHOST_RECOVERY bit in shost->shost_state + 3. Increments shost->host_failed - 4. Increments shost->host_failed - - 5. Wakes up SCSI EH thread if shost->host_busy == shost->host_failed + 4. Wakes up SCSI EH thread if shost->host_busy == shost->host_failed As can be seen above, once any scmd is added to shost->eh_cmd_q, SHOST_RECOVERY shost_state bit is turned on. This prevents any new @@ -252,7 +247,6 @@ scmd->allowed. 1. Error completion / time out ACTION: scsi_eh_scmd_add() is invoked for scmd - - set scmd->eh_eflags - add scmd to shost->eh_cmd_q - set SHOST_RECOVERY - shost->host_failed++ |