[PATCH 04/16] a1000u2w: do not rely on the command for inia100_device_reset()

[Hannes Reinecke <hare@xxxxxxx>]

Use the scsi device as argument to orc_device_reset() instead
of relying on the passed in scsi command.

Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/scsi/a100u2w.c | 46 +++++++++++-------------------------------
 1 file changed, 12 insertions(+), 34 deletions(-)

diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c
index b95147fb18b0..ab57bb8f6850 100644
--- a/drivers/scsi/a100u2w.c
+++ b/drivers/scsi/a100u2w.c
@@ -585,46 +585,26 @@ static int orc_reset_scsi_bus(struct orc_host * host)
 /**
  *	orc_device_reset	-	device reset handler
  *	@host: host to reset
- *	@cmd: command causing the reset
- *	@target: target device
+ *	@sdev: target device
  *
  *	Reset registers, reset a hanging bus and kill active and disconnected
  *	commands for target w/o soft reset
  */
 
-static int orc_device_reset(struct orc_host * host, struct scsi_cmnd *cmd, unsigned int target)
+static int orc_device_reset(struct orc_host * host, struct scsi_device *sdev)
 {				/* I need Host Control Block Information */
 	struct orc_scb *scb;
 	struct orc_extended_scb *escb;
-	struct orc_scb *host_scb;
-	u8 i;
 	unsigned long flags;
 
 	spin_lock_irqsave(&(host->allocation_lock), flags);
 	scb = (struct orc_scb *) NULL;
 	escb = (struct orc_extended_scb *) NULL;
 
-	/* setup scatter list address with one buffer */
-	host_scb = host->scb_virt;
-
 	/* FIXME: is this safe if we then fail to issue the reset or race
 	   a completion ? */
 	init_alloc_map(host);
 
-	/* Find the scb corresponding to the command */
-	for (i = 0; i < ORC_MAXQUEUE; i++) {
-		escb = host_scb->escb;
-		if (host_scb->status && escb->srb == cmd)
-			break;
-		host_scb++;
-	}
-
-	if (i == ORC_MAXQUEUE) {
-		printk(KERN_ERR "Unable to Reset - No SCB Found\n");
-		spin_unlock_irqrestore(&(host->allocation_lock), flags);
-		return FAILED;
-	}
-
 	/* Allocate a new SCB for the reset command to the firmware */
 	if ((scb = __orc_alloc_scb(host)) == NULL) {
 		/* Can't happen.. */
@@ -635,7 +615,7 @@ static int orc_device_reset(struct orc_host * host, struct scsi_cmnd *cmd, unsig
 	/* Reset device is handled by the firmware, we fill in an SCB and
 	   fire it at the controller, it does the rest */
 	scb->opcode = ORC_BUSDEVRST;
-	scb->target = target;
+	scb->target = sdev->id;
 	scb->hastat = 0;
 	scb->tastat = 0;
 	scb->status = 0x0;
@@ -645,8 +625,8 @@ static int orc_device_reset(struct orc_host * host, struct scsi_cmnd *cmd, unsig
 	scb->xferlen = cpu_to_le32(0);
 	scb->sg_len = cpu_to_le32(0);
 
+	escb = scb->escb;
 	escb->srb = NULL;
-	escb->srb = cmd;
 	orc_exec_scb(host, scb);	/* Start execute SCB            */
 	spin_unlock_irqrestore(&host->allocation_lock, flags);
 	return SUCCESS;
@@ -971,7 +951,7 @@ static int inia100_device_reset(struct scsi_cmnd * cmd)
 {				/* I need Host Control Block Information */
 	struct orc_host *host;
 	host = (struct orc_host *) cmd->device->host->hostdata;
-	return orc_device_reset(host, cmd, scmd_id(cmd));
+	return orc_device_reset(host, cmd->device);
 
 }
 
@@ -991,11 +971,7 @@ static void inia100_scb_handler(struct orc_host *host, struct orc_scb *scb)
 	struct orc_extended_scb *escb;
 
 	escb = scb->escb;
-	if ((cmd = (struct scsi_cmnd *) escb->srb) == NULL) {
-		printk(KERN_ERR "inia100_scb_handler: SRB pointer is empty\n");
-		orc_release_scb(host, scb);	/* Release SCB for current channel */
-		return;
-	}
+	cmd = (struct scsi_cmnd *)escb->srb;
 	escb->srb = NULL;
 
 	switch (scb->hastat) {
@@ -1033,13 +1009,15 @@ static void inia100_scb_handler(struct orc_host *host, struct orc_scb *scb)
 		break;
 	}
 
-	if (scb->tastat == 2) {	/* Check condition              */
+	if (cmd && scb->tastat == 2) {	/* Check condition              */
 		memcpy((unsigned char *) &cmd->sense_buffer[0],
 		   (unsigned char *) &escb->sglist[0], SENSE_SIZE);
 	}
-	cmd->result = scb->tastat | (scb->hastat << 16);
-	scsi_dma_unmap(cmd);
-	scsi_done(cmd);		/* Notify system DONE           */
+	if (cmd) {
+		cmd->result = scb->tastat | (scb->hastat << 16);
+		scsi_dma_unmap(cmd);
+		scsi_done(cmd);		/* Notify system DONE           */
+	}
 	orc_release_scb(host, scb);	/* Release SCB for current channel */
 }
 
-- 
2.35.3