On Thu, 2015-12-03 at 08:17 +0100, Hannes Reinecke wrote:
> scsi_eh_scmd_add() currently only will fail if no
> error handler thread is started (which will never be the
> case) or if the state machine encounters an illegal transition.
>
> But if we're encountering an invalid state transition
> chances is we cannot fixup things with the error handler.
> So better add a WARN_ON for illegal host states and
> make scsi_dh_scmd_add() a void function.
>
> Signed-off-by: Hannes Reinecke <h...@suse.de>
> ---
> drivers/scsi/scsi_error.c | 39 +++++++++++++--------------------------
> drivers/scsi/scsi_lib.c | 4 ++--
> drivers/scsi/scsi_priv.h | 2 +-
> 3 files changed, 16 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
> index 984ddcb..deb35737 100644
> --- a/drivers/scsi/scsi_error.c
> +++ b/drivers/scsi/scsi_error.c
> @@ -162,13 +162,7 @@ scmd_eh_abort_handler(struct work_struct *work)
> }
> }
>
> - if (!scsi_eh_scmd_add(scmd, 0)) {
> - SCSI_LOG_ERROR_RECOVERY(3,
> - scmd_printk(KERN_WARNING, scmd,
> - "terminate aborted command\n"));
> - set_host_byte(scmd, DID_TIME_OUT);
> - scsi_finish_command(scmd);
> - }
> + scsi_eh_scmd_add(scmd, 0);
> }
>
> /**
> @@ -224,37 +218,32 @@ scsi_abort_command(struct scsi_cmnd *scmd)
> * scsi_eh_scmd_add - add scsi cmd to error handling.
> * @scmd: scmd to run eh on.
> * @eh_flag: optional SCSI_EH flag.
> - *
> - * Return value:
> - * 0 on failure.
> */
> -int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
> +void scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
> {
> struct Scsi_Host *shost = scmd->device->host;
> unsigned long flags;
> - int ret = 0;
>
> - if (!shost->ehandler)
> - return 0;
> + WARN_ON(!shost->ehandler);
>
> spin_lock_irqsave(shost->host_lock, flags);
> + WARN_ON(shost->shost_state != SHOST_RUNNING &&
> + shost->shost_state != SHOST_CANCEL &&
> + shost->shost_state != SHOST_RECOVERY &&
> + shost->shost_state != SHOST_CANCEL_RECOVERY);
> if (scsi_host_set_state(shost, SHOST_RECOVERY))
> - if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY))
> - goto out_unlock;
> + scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY);
>
> if (shost->eh_deadline != -1 && !shost->last_reset)
> shost->last_reset = jiffies;
>
> - ret = 1;
> if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED)
> eh_flag &= ~SCSI_EH_CANCEL_CMD;
> scmd->eh_eflags |= eh_flag;
> list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
> shost->host_failed++;
> scsi_eh_wakeup(shost);
> - out_unlock:
> spin_unlock_irqrestore(shost->host_lock, flags);
> - return ret;
> }
>
> /**
> @@ -285,13 +274,11 @@ enum blk_eh_timer_return scsi_times_out(struct request
> *req)
> rtn = host->hostt->eh_timed_out(scmd);
>
> if (rtn == BLK_EH_NOT_HANDLED) {
> - if (!host->hostt->no_async_abort &&
> - scsi_abort_command(scmd) == SUCCESS)
> - return BLK_EH_NOT_HANDLED;
> -
> - set_host_byte(scmd, DID_TIME_OUT);
> - if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))
> - rtn = BLK_EH_HANDLED;
> + if (host->hostt->no_async_abort ||
> + scsi_abort_command(scmd) != SUCCESS) {
> + set_host_byte(scmd, DID_TIME_OUT);
> + scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD);
> + }
> }
>
> return rtn;
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index fa6b2c4..2dd7d0a 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1647,8 +1647,8 @@ static void scsi_softirq_done(struct request *rq)
> scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY);
> break;
> default:
> - if (!scsi_eh_scmd_add(cmd, 0))
> - scsi_finish_command(cmd);
> + scsi_eh_scmd_add(cmd, 0);
> + break;
> }
> }
>
> diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
> index 27b4d0a..8c26823 100644
> --- a/drivers/scsi/scsi_priv.h
> +++ b/drivers/scsi/scsi_priv.h
> @@ -71,7 +71,7 @@ extern enum blk_eh_timer_return scsi_times_out(struct
> request *req);
> extern int scsi_error_handler(void *host);
> extern int scsi_decide_disposition(struct scsi_cmnd *cmd);
> extern void scsi_eh_wakeup(struct Scsi_Host *shost);
> -extern int scsi_eh_scmd_add(struct scsi_cmnd *, int);
> +extern void scsi_eh_scmd_add(struct scsi_cmnd *, int);
> void scsi_eh_ready_devs(struct Scsi_Host *shost,
> struct list_head *work_q,
> struct list_head *done_q);
Reviewed-by: Johannes Thumshirn <jthumsh...@suse.de>
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