Commit 6b0e87a6 authored by Finn Thain's avatar Finn Thain Committed by Martin K. Petersen
Browse files

scsi: NCR5380: Check for bus reset 



The SR_RST bit isn't latched. Hence, detecting a bus reset isn't reliable.
When it is detected, the right thing to do is to drop all connected and
disconnected commands. The code for that is already present so refactor it and
call it when SR_RST is set.

Tested-by: default avatarMichael Schmitz <schmitzmic@gmail.com>
Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent ca694afa

drivers/scsi/NCR5380.c

+45 −29
Original line number Diff line number Diff line
@@ -131,6 +131,7 @@ 


static int do_abort(struct Scsi_Host *);

static void do_reset(struct Scsi_Host *);

static void bus_reset_cleanup(struct Scsi_Host *);



/**

 * initialize_SCp - init the scsi pointer field
@@ -883,7 +884,14 @@ static irqreturn_t __maybe_unused NCR5380_intr(int irq, void *dev_id) 
			/* Probably Bus Reset */

			NCR5380_read(RESET_PARITY_INTERRUPT_REG);



			if (sr & SR_RST) {

				/* Certainly Bus Reset */

				shost_printk(KERN_WARNING, instance,

					     "bus reset interrupt\n");

				bus_reset_cleanup(instance);

			} else {

				dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n");

			}

#ifdef SUN3_SCSI_VME

			dregs->csr |= CSR_DMA_ENABLE;

#endif
@@ -2305,31 +2313,12 @@ out: 
}





/**

 * NCR5380_host_reset - reset the SCSI host

 * @cmd: SCSI command undergoing EH

 *

 * Returns SUCCESS

 */



static int NCR5380_host_reset(struct scsi_cmnd *cmd)

static void bus_reset_cleanup(struct Scsi_Host *instance)

{

	struct Scsi_Host *instance = cmd->device->host;

	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	int i;

	unsigned long flags;

	struct NCR5380_cmd *ncmd;



	spin_lock_irqsave(&hostdata->lock, flags);



#if (NDEBUG & NDEBUG_ANY)

	shost_printk(KERN_INFO, instance, __func__);

#endif

	NCR5380_dprint(NDEBUG_ANY, instance);

	NCR5380_dprint_phase(NDEBUG_ANY, instance);



	do_reset(instance);



	/* reset NCR registers */

	NCR5380_write(MODE_REG, MR_BASE);

	NCR5380_write(TARGET_COMMAND_REG, 0);
@@ -2341,14 +2330,6 @@ static int NCR5380_host_reset(struct scsi_cmnd *cmd) 
	 * commands!

	 */



	list_for_each_entry(ncmd, &hostdata->unissued, list) {

		struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);



		cmd->result = DID_RESET << 16;

		cmd->scsi_done(cmd);

	}

	INIT_LIST_HEAD(&hostdata->unissued);



	if (hostdata->selecting) {

		hostdata->selecting->result = DID_RESET << 16;

		complete_cmd(instance, hostdata->selecting);
@@ -2382,6 +2363,41 @@ static int NCR5380_host_reset(struct scsi_cmnd *cmd) 


	queue_work(hostdata->work_q, &hostdata->main_task);

	maybe_release_dma_irq(instance);

}



/**

 * NCR5380_host_reset - reset the SCSI host

 * @cmd: SCSI command undergoing EH

 *

 * Returns SUCCESS

 */



static int NCR5380_host_reset(struct scsi_cmnd *cmd)

{

	struct Scsi_Host *instance = cmd->device->host;

	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	unsigned long flags;

	struct NCR5380_cmd *ncmd;



	spin_lock_irqsave(&hostdata->lock, flags);



#if (NDEBUG & NDEBUG_ANY)

	shost_printk(KERN_INFO, instance, __func__);

#endif

	NCR5380_dprint(NDEBUG_ANY, instance);

	NCR5380_dprint_phase(NDEBUG_ANY, instance);



	list_for_each_entry(ncmd, &hostdata->unissued, list) {

		struct scsi_cmnd *scmd = NCR5380_to_scmd(ncmd);



		scmd->result = DID_RESET << 16;

		scmd->scsi_done(scmd);

	}

	INIT_LIST_HEAD(&hostdata->unissued);



	do_reset(instance);

	bus_reset_cleanup(instance);



	spin_unlock_irqrestore(&hostdata->lock, flags);



	return SUCCESS;

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