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| author | Hannes Reinecke <hare@suse.de> | 2017-04-06 16:36:33 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-04-06 20:07:33 +0300 |
| commit | 8e8c9d01c5ea33e0d21f13264a9caeed255526d1 (patch) | |
| tree | bf9748c6e26a839b43cf841ceb59b4efa4bc1ec4 /Documentation/scsi/scsi_eh.txt | |
| parent | 909657615d9b3ce709be4fd95b9a9e8c8c7c2be6 (diff) | |
| download | linux-8e8c9d01c5ea33e0d21f13264a9caeed255526d1.tar.xz | |
scsi: make eh_eflags persistent
If a failed command is retried and fails again we need
to enter SCSI EH, otherwise we will never be able to
recover the command.
To detect this situation we must not clear scmd->eh_eflags
when EH finishes but rather make it persistent throughout
the lifetime of the command.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation/scsi/scsi_eh.txt')
| -rw-r--r-- | Documentation/scsi/scsi_eh.txt | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/scsi/scsi_eh.txt b/Documentation/scsi/scsi_eh.txt index 37eca00796ee..4edb9c1cbef5 100644 --- a/Documentation/scsi/scsi_eh.txt +++ b/Documentation/scsi/scsi_eh.txt @@ -105,11 +105,14 @@ function 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. If that fails - Step #3 is taken. + 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), + or when the EH deadline is expired. In these case Step #3 is taken. - 2. scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD) is invoked for the - command. See [1-3] for more information. + 3. scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD) is invoked for the + command. See [1-4] for more information. [1-3] Asynchronous command aborts @@ -263,7 +266,6 @@ scmd->allowed. 3. scmd recovered ACTION: scsi_eh_finish_cmd() is invoked to EH-finish scmd - - clear scmd->eh_eflags - scsi_setup_cmd_retry() - move from local eh_work_q to local eh_done_q LOCKING: none @@ -456,8 +458,6 @@ except for #1 must be implemented by eh_strategy_handler(). - shost->host_failed is zero. - - Each scmd's eh_eflags field is cleared. - - Each scmd is in such a state that scsi_setup_cmd_retry() on the scmd doesn't make any difference. |