Re: [PATCH v2 3/4] scsi: st: Modify st.c to use the new scsi_error counters

[John Meneghini <jmeneghi@redhat.com>]

Reviewed-by: John Meneghini <jmeneghi@redhat.com>
Tested-by: John Meneghini <jmeneghi@redhat.com>

On 11/25/24 09:03, Kai Mäkisara wrote:
> Compare the stored values of por_ctr and new_media_ctr against
> the values in the device struct. In case of mismatch, the
> Unit Attention corresponding to the counter has happened.
> This is a safeguard against another ULD catching the
> Unit Attention sense data.
> 
> Remove use of the was_reset flag in struct scsi_device.
> 
> Signed-off-by: Kai Mäkisara <Kai.Makisara@kolumbus.fi>
> ---
>   drivers/scsi/st.c | 28 +++++++++++++++++++++++++---
>   drivers/scsi/st.h |  4 ++++
>   2 files changed, 29 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
> index a0667a0ae4c9..ad86dfbc8919 100644
> --- a/drivers/scsi/st.c
> +++ b/drivers/scsi/st.c
> @@ -163,9 +163,11 @@ static const char *st_formats[] = {
>   
>   static int debugging = DEBUG;
>   
> +/* Setting these non-zero may risk recognizing resets */
>   #define MAX_RETRIES 0
>   #define MAX_WRITE_RETRIES 0
>   #define MAX_READY_RETRIES 0
> +
>   #define NO_TAPE  NOT_READY
>   
>   #define ST_TIMEOUT (900 * HZ)
> @@ -357,10 +359,18 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
>   {
>   	int result = SRpnt->result;
>   	u8 scode;
> +	unsigned int ctr;
>   	DEB(const char *stp;)
>   	char *name = STp->name;
>   	struct st_cmdstatus *cmdstatp;
>   
> +	ctr = scsi_get_ua_por_ctr(STp->device);
> +	if (ctr != STp->por_ctr) {
> +		STp->por_ctr = ctr;
> +		STp->pos_unknown = 1; /* ASC => power on / reset */
> +		st_printk(KERN_WARNING, STp, "Power on/reset recognized.");
> +	}
> +
>   	if (!result)
>   		return 0;
>   
> @@ -413,10 +423,11 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
>   	if (cmdstatp->have_sense &&
>   	    cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
>   		STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
> -	if (cmdstatp->have_sense && scode == UNIT_ATTENTION && cmdstatp->sense_hdr.asc == 0x29)
> +	if (cmdstatp->have_sense && scode == UNIT_ATTENTION &&
> +		cmdstatp->sense_hdr.asc == 0x29 && !STp->pos_unknown) {
>   		STp->pos_unknown = 1; /* ASC => power on / reset */
> -
> -	STp->pos_unknown |= STp->device->was_reset;
> +		st_printk(KERN_WARNING, STp, "Power on/reset recognized.");
> +	}
>   
>   	if (cmdstatp->have_sense &&
>   	    scode == RECOVERED_ERROR
> @@ -968,6 +979,7 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
>   {
>   	int attentions, waits, max_wait, scode;
>   	int retval = CHKRES_READY, new_session = 0;
> +	unsigned int ctr;
>   	unsigned char cmd[MAX_COMMAND_SIZE];
>   	struct st_request *SRpnt = NULL;
>   	struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
> @@ -1024,6 +1036,13 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
>   			}
>   		}
>   
> +		ctr = scsi_get_ua_new_media_ctr(STp->device);
> +		if (ctr != STp->new_media_ctr) {
> +			STp->new_media_ctr = ctr;
> +			new_session = 1;
> +			DEBC_printk(STp, "New tape session.");
> +		}
> +
>   		retval = (STp->buffer)->syscall_result;
>   		if (!retval)
>   			retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
> @@ -4394,6 +4413,9 @@ static int st_probe(struct device *dev)
>   		goto out_idr_remove;
>   	}
>   
> +	tpnt->new_media_ctr = scsi_get_ua_new_media_ctr(SDp);
> +	tpnt->por_ctr = scsi_get_ua_por_ctr(SDp);
> +
>   	dev_set_drvdata(dev, tpnt);
>   
>   
> diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h
> index 2105c6a5b458..47b0e31b7828 100644
> --- a/drivers/scsi/st.h
> +++ b/drivers/scsi/st.h
> @@ -178,6 +178,10 @@ struct scsi_tape {
>   	int recover_count;     /* From tape opening */
>   	int recover_reg;       /* From last status call */
>   
> +	/* The saved values of midlevel counters */
> +	unsigned int new_media_ctr;
> +	unsigned int por_ctr;
> +
>   #if DEBUG
>   	unsigned char write_pending;
>   	int nbr_finished;