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scsi: core: Simplify control flow in scmd_eh_abort_handler()

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Simplify the nested conditionals in the function by using a label for the
error path.  Introduce local "shost" to avoid repeated "sdev->shost" usage.
Also remove scsi_eh_complete_abort() since there is now only one place it
would be called.

Link: https://lore.kernel.org/r/20211029194311.17504-3-emilne@redhat.com
Signed-off-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ewan D. Milne 2021-10-29 15:43:11 -04:00 committed by Martin K. Petersen
parent fa55b7dcdc
commit 54d816d3d3
1 changed files with 57 additions and 56 deletions
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113
drivers/scsi/scsi_error.c
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@ -133,23 +133,6 @@ static bool scsi_eh_should_retry_cmd(struct scsi_cmnd *cmd)
return true;
}
static void scsi_eh_complete_abort(struct scsi_cmnd *scmd, struct Scsi_Host *shost)
{
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
list_del_init(&scmd->eh_entry);
/*
* If the abort succeeds, and there is no further
* EH action, clear the ->last_reset time.
*/
if (list_empty(&shost->eh_abort_list) &&
list_empty(&shost->eh_cmd_q))
if (shost->eh_deadline != -1)
shost->last_reset = 0;
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* scmd_eh_abort_handler - Handle command aborts
* @work: command to be aborted.
@ -166,54 +149,72 @@ scmd_eh_abort_handler(struct work_struct *work)
struct scsi_cmnd *scmd =
container_of(work, struct scsi_cmnd, abort_work.work);
struct scsi_device *sdev = scmd->device;
struct Scsi_Host *shost = sdev->host;
enum scsi_disposition rtn;
unsigned long flags;
if (scsi_host_eh_past_deadline(sdev->host)) {
if (scsi_host_eh_past_deadline(shost)) {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_INFO, scmd,
"eh timeout, not aborting\n"));
} else {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_INFO, scmd,
"aborting command\n"));
rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd);
if (rtn == SUCCESS) {
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,
"eh timeout, not retrying "
"aborted command\n"));
} else if (!scsi_noretry_cmd(scmd) &&
scsi_cmd_retry_allowed(scmd) &&
scsi_eh_should_retry_cmd(scmd)) {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_WARNING, scmd,
"retry aborted command\n"));
scsi_eh_complete_abort(scmd, sdev->host);
scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
return;
} else {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_WARNING, scmd,
"finish aborted command\n"));
scsi_eh_complete_abort(scmd, sdev->host);
scsi_finish_command(scmd);
return;
}
} else {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_INFO, scmd,
"cmd abort %s\n",
(rtn == FAST_IO_FAIL) ?
"not send" : "failed"));
}
goto out;
}
spin_lock_irqsave(sdev->host->host_lock, flags);
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_INFO, scmd,
"aborting command\n"));
rtn = scsi_try_to_abort_cmd(shost->hostt, scmd);
if (rtn != SUCCESS) {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_INFO, scmd,
"cmd abort %s\n",
(rtn == FAST_IO_FAIL) ?
"not send" : "failed"));
goto out;
}
set_host_byte(scmd, DID_TIME_OUT);
if (scsi_host_eh_past_deadline(shost)) {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_INFO, scmd,
"eh timeout, not retrying "
"aborted command\n"));
goto out;
}
spin_lock_irqsave(shost->host_lock, flags);
list_del_init(&scmd->eh_entry);
spin_unlock_irqrestore(sdev->host->host_lock, flags);
/*
* If the abort succeeds, and there is no further
* EH action, clear the ->last_reset time.
*/
if (list_empty(&shost->eh_abort_list) &&
list_empty(&shost->eh_cmd_q))
if (shost->eh_deadline != -1)
shost->last_reset = 0;
spin_unlock_irqrestore(shost->host_lock, flags);
if (!scsi_noretry_cmd(scmd) &&
scsi_cmd_retry_allowed(scmd) &&
scsi_eh_should_retry_cmd(scmd)) {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_WARNING, scmd,
"retry aborted command\n"));
scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
} else {
SCSI_LOG_ERROR_RECOVERY(3,
scmd_printk(KERN_WARNING, scmd,
"finish aborted command\n"));
scsi_finish_command(scmd);
}
return;
out:
spin_lock_irqsave(shost->host_lock, flags);
list_del_init(&scmd->eh_entry);
spin_unlock_irqrestore(shost->host_lock, flags);
scsi_eh_scmd_add(scmd);
}