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From: Stephen M. Cameron on 26 Feb 2010 17:00
From: Stephen M. Cameron <scameron(a)beardog.cce.hp.com>

cciss: eliminate unnecessary pointer use in cciss scsi code
An extra level of indirection was being used in some places
for no real reason.

Signed-off-by: Stephen M. Cameron <scameron(a)beardog.cce.hp.com>
---
drivers/block/cciss_scsi.c | 31 +++++++++++++++----------------
1 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index c458232..6dc15b6 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -1400,7 +1400,7 @@ cciss_scatter_gather(struct pci_dev *pdev,
static int
cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
{
- ctlr_info_t **c;
+ ctlr_info_t *c;
int ctlr, rc;
unsigned char scsi3addr[8];
CommandList_struct *cp;
@@ -1408,8 +1408,8 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd

// Get the ptr to our adapter structure (hba[i]) out of cmd->host.
// We violate cmd->host privacy here. (Is there another way?)
- c = (ctlr_info_t **) &cmd->device->host->hostdata[0];
- ctlr = (*c)->ctlr;
+ c = (ctlr_info_t *) cmd->device->host->hostdata[0];
+ ctlr = c->ctlr;

rc = lookup_scsi3addr(ctlr, cmd->device->channel, cmd->device->id,
cmd->device->lun, scsi3addr);
@@ -1432,7 +1432,7 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
see what the device thinks of it. */

spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- cp = scsi_cmd_alloc(*c);
+ cp = scsi_cmd_alloc(c);
spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
if (cp == NULL) { /* trouble... */
printk("scsi_cmd_alloc returned NULL!\n");
@@ -1490,15 +1490,14 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
BUG();
break;
}
-
- cciss_scatter_gather((*c)->pdev, cp, cmd); // Fill the SG list
+ cciss_scatter_gather(c->pdev, cp, cmd);

/* Put the request on the tail of the request queue */

spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- addQ(&(*c)->reqQ, cp);
- (*c)->Qdepth++;
- start_io(*c);
+ addQ(&c->reqQ, cp);
+ c->Qdepth++;
+ start_io(c);
spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);

/* the cmd'll come back via intr handler in complete_scsi_command() */
@@ -1655,14 +1654,14 @@ static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
int rc;
CommandList_struct *cmd_in_trouble;
unsigned char lunaddr[8];
- ctlr_info_t **c;
+ ctlr_info_t *c;
int ctlr;

/* find the controller to which the command to be aborted was sent */
- c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];
+ c = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
if (c == NULL) /* paranoia */
return FAILED;
- ctlr = (*c)->ctlr;
+ ctlr = c->ctlr;
printk(KERN_WARNING "cciss%d: resetting tape drive or medium changer.\n", ctlr);
/* find the command that's giving us trouble */
cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
@@ -1672,7 +1671,7 @@ static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
/* send a reset to the SCSI LUN which the command was sent to */
rc = sendcmd_withirq(CCISS_RESET_MSG, ctlr, NULL, 0, 0, lunaddr,
TYPE_MSG);
- if (rc == 0 && wait_for_device_to_become_ready(*c, lunaddr) == 0)
+ if (rc == 0 && wait_for_device_to_become_ready(c, lunaddr) == 0)
return SUCCESS;
printk(KERN_WARNING "cciss%d: resetting device failed.\n", ctlr);
return FAILED;
@@ -1683,14 +1682,14 @@ static int cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
int rc;
CommandList_struct *cmd_to_abort;
unsigned char lunaddr[8];
- ctlr_info_t **c;
+ ctlr_info_t *c;
int ctlr;

/* find the controller to which the command to be aborted was sent */
- c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];
+ c = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
if (c == NULL) /* paranoia */
return FAILED;
- ctlr = (*c)->ctlr;
+ ctlr = c->ctlr;
printk(KERN_WARNING "cciss%d: aborting tardy SCSI cmd\n", ctlr);

/* find the command to be aborted */

--
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Prev: MAINTAINERS: update drivers/platform/x86 information
Next: [PATCH 6/9] cciss: factor out scatter gather chain block mapping code