linux-kernel - Re: [PATCH v2 2/7] scsi: NCR5380: Always re-enable reselection interrupt

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Date:   Tue, 11 Jun 2019 17:07:16 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Finn Thain <fthain@...egraphics.com.au>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 2/7] scsi: NCR5380: Always re-enable reselection
 interrupt

Hi Finn,

IIRC I'd tested that change as well - didn't change broken target 
behaviour but no regressions in other respects. Add my tested-by if needed.

Cheers,

	Michael


Am 09.06.2019 um 13:19 schrieb Finn Thain:
> The reselection interrupt gets disabled during selection and must be
> re-enabled when hostdata->connected becomes NULL. If it isn't re-enabled
> a disconnected command may time-out or the target may wedge the bus while
> trying to reselect the host. This can happen after a command is aborted.
>
> Fix this by enabling the reselection interrupt in NCR5380_main() after
> calls to NCR5380_select() and NCR5380_information_transfer() return.
>
> Cc: Michael Schmitz <schmitzmic@...il.com>
> Cc: stable@...r.kernel.org # v4.9+
> Fixes: 8b00c3d5d40d ("ncr5380: Implement new eh_abort_handler")
> Tested-by: Stan Johnson <userm57@...oo.com>
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
> ---
>  drivers/scsi/NCR5380.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
> index fe0535affc14..08e3ea8159b3 100644
> --- a/drivers/scsi/NCR5380.c
> +++ b/drivers/scsi/NCR5380.c
> @@ -709,6 +709,8 @@ static void NCR5380_main(struct work_struct *work)
>  			NCR5380_information_transfer(instance);
>  			done = 0;
>  		}
> +		if (!hostdata->connected)
> +			NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
>  		spin_unlock_irq(&hostdata->lock);
>  		if (!done)
>  			cond_resched();
> @@ -1110,8 +1112,6 @@ static bool NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
>  		spin_lock_irq(&hostdata->lock);
>  		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
>  		NCR5380_reselect(instance);
> -		if (!hostdata->connected)
> -			NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
>  		shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n");
>  		goto out;
>  	}
> @@ -1119,7 +1119,6 @@ static bool NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
>  	if (err < 0) {
>  		spin_lock_irq(&hostdata->lock);
>  		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
> -		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
>
>  		/* Can't touch cmd if it has been reclaimed by the scsi ML */
>  		if (!hostdata->selecting)
> @@ -1157,7 +1156,6 @@ static bool NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
>  	if (err < 0) {
>  		shost_printk(KERN_ERR, instance, "select: REQ timeout\n");
>  		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
> -		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
>  		goto out;
>  	}
>  	if (!hostdata->selecting) {
> @@ -1826,9 +1824,6 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
>  					 */
>  					NCR5380_write(TARGET_COMMAND_REG, 0);
>
> -					/* Enable reselect interrupts */
> -					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
> -
>  					maybe_release_dma_irq(instance);
>  					return;
>  				case MESSAGE_REJECT:
> @@ -1860,8 +1855,6 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
>  					 */
>  					NCR5380_write(TARGET_COMMAND_REG, 0);
>
> -					/* Enable reselect interrupts */
> -					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
>  #ifdef SUN3_SCSI_VME
>  					dregs->csr |= CSR_DMA_ENABLE;
>  #endif
> @@ -1964,7 +1957,6 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
>  					cmd->result = DID_ERROR << 16;
>  					complete_cmd(instance, cmd);
>  					maybe_release_dma_irq(instance);
> -					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
>  					return;
>  				}
>  				msgout = NOP;
>