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Diffstat (limited to '')
| -rw-r--r-- | Documentation/scsi/scsi_eh.rst | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/Documentation/scsi/scsi_eh.rst b/Documentation/scsi/scsi_eh.rst index 7d78c2475615..bad624fab823 100644 --- a/Documentation/scsi/scsi_eh.rst +++ b/Documentation/scsi/scsi_eh.rst @@ -87,27 +87,25 @@ with the command. 1.2.2 Completing a scmd w/ timeout ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -The timeout handler is scsi_times_out(). When a timeout occurs, this -function +The timeout handler is scsi_timeout(). When a timeout occurs, this function 1. invokes optional hostt->eh_timed_out() callback. Return value can be one of - BLK_EH_RESET_TIMER This indicates that more time is required to finish the - command. Timer is restarted. This action is counted as a - retry and only allowed scmd->allowed + 1(!) times. Once the - limit is reached, action for BLK_EH_DONE is taken instead. + command. Timer is restarted. - BLK_EH_DONE eh_timed_out() callback did not handle the command. Step #2 is taken. - 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), - or when the EH deadline is expired. In these case Step #3 is taken. + 2. scsi_abort_command() is invoked to schedule an asynchronous abort which may + issue a retry scmd->allowed + 1 times. Asynchronous aborts are not invoked + for commands for 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), when retries are exceeded, or when the EH deadline is + expired. In these cases Step #3 is taken. 3. scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD) is invoked for the command. See [1-4] for more information. |