Re: [RFC PATCH v3 04/19] scsi: scsi_error: Add helper scsi_eh_sdev_stu to do START_UNIT

[JiangJianJun <jiangjianjun3@huawei.com>]

 > From: Wenchao Hao <haowenchao2@huawei.com>
 >
 > Add helper function scsi_eh_sdev_stu() to perform START_UNIT and check
 > if to finish some error commands.
 >
 > > This is preparation for a genernal LUN/target based error handle
 > > strategy and did not change original logic.
 > >
 > > Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
 > > ---
 > >  drivers/scsi/scsi_error.c | 50 +++++++++++++++++++++++----------------
 > >  1 file changed, 29 insertions(+), 21 deletions(-)
 > >
 > > diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
 > > index cc3a5adb9daa..3b55642fb585 100644
 > > --- a/drivers/scsi/scsi_error.c
 > > +++ b/drivers/scsi/scsi_error.c
 > > @@ -1567,6 +1567,31 @@ static int scsi_eh_try_stu(struct scsi_cmnd 
*scmd)
 > >  	return 1;
 > >  }
 > >
 > > +static int scsi_eh_sdev_stu(struct scsi_cmnd *scmd,
 > > +			      struct list_head *work_q,
 > > +			      struct list_head *done_q)
 > > +{
 > > +	struct scsi_device *sdev = scmd->device;
 > > +	struct scsi_cmnd *next;
 > > +
 > > +	SCSI_LOG_ERROR_RECOVERY(3, sdev_printk(KERN_INFO, sdev,
 > > +				"%s: Sending START_UNIT\n", current->comm));
 > > +
 >
 > As in the scsi_eh_stu, SCSI_SENSE_VALID and scsi_check_sense is required
 > before calling scsi_eh_try_stu.

But the SCSI_SENSE_VALID and scsi_check_sense has been called before 
calling scsi_eh_try_stu, see in loop devices in scsi_eh_stu, do you 
means re-call at here?