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Date:	Mon, 31 Aug 2009 00:51:34 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-scsi <linux-scsi@...r.kernel.org>
cc:	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	Mike Anderson <andmike@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi_error size reduction and readability improvement


Make scsi_error.c a bit easier to read by cutting down on the number of 
long lines of pointer derefs. Also decrease object size a bit;
  $ size drivers/scsi/scsi_error.o*
     text    data     bss     dec     hex filename
     6755       6       6    6767    1a6f drivers/scsi/scsi_error.o
     6767       6       6    6779    1a7b drivers/scsi/scsi_error.o.orig

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index a168935..094fe8a 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -124,14 +124,15 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
 enum blk_eh_timer_return scsi_times_out(struct request *req)
 {
 	struct scsi_cmnd *scmd = req->special;
+	struct Scsi_Host *shost = scmd->device->host;
 	enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
 
 	scsi_log_completion(scmd, TIMEOUT_ERROR);
 
-	if (scmd->device->host->transportt->eh_timed_out)
-		rtn = scmd->device->host->transportt->eh_timed_out(scmd);
-	else if (scmd->device->host->hostt->eh_timed_out)
-		rtn = scmd->device->host->hostt->eh_timed_out(scmd);
+	if (shost->transportt->eh_timed_out)
+		rtn = shost->transportt->eh_timed_out(scmd);
+	else if (shost->hostt->eh_timed_out)
+		rtn = shost->hostt->eh_timed_out(scmd);
 
 	if (unlikely(rtn == BLK_EH_NOT_HANDLED &&
 		     !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
@@ -414,24 +415,24 @@ static void scsi_eh_done(struct scsi_cmnd *scmd)
  */
 static int scsi_try_host_reset(struct scsi_cmnd *scmd)
 {
+	struct Scsi_Host *shost = scmd->device->host;
 	unsigned long flags;
 	int rtn;
 
 	SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
 					  __func__));
 
-	if (!scmd->device->host->hostt->eh_host_reset_handler)
+	if (!shost->hostt->eh_host_reset_handler)
 		return FAILED;
 
-	rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
+	rtn = shost->hostt->eh_host_reset_handler(scmd);
 
 	if (rtn == SUCCESS) {
-		if (!scmd->device->host->hostt->skip_settle_delay)
+		if (!shost->hostt->skip_settle_delay)
 			ssleep(HOST_RESET_SETTLE_TIME);
-		spin_lock_irqsave(scmd->device->host->host_lock, flags);
-		scsi_report_bus_reset(scmd->device->host,
-				      scmd_channel(scmd));
-		spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+		spin_lock_irqsave(shost->host_lock, flags);
+		scsi_report_bus_reset(shost, scmd_channel(scmd));
+		spin_unlock_irqrestore(shost->host_lock, flags);
 	}
 
 	return rtn;
@@ -443,24 +444,24 @@ static int scsi_try_host_reset(struct scsi_cmnd *scmd)
  */
 static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
 {
+	struct Scsi_Host *shost = scmd->device->host;
 	unsigned long flags;
 	int rtn;
 
 	SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
 					  __func__));
 
-	if (!scmd->device->host->hostt->eh_bus_reset_handler)
+	if (!shost->hostt->eh_bus_reset_handler)
 		return FAILED;
 
-	rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
+	rtn = shost->hostt->eh_bus_reset_handler(scmd);
 
 	if (rtn == SUCCESS) {
-		if (!scmd->device->host->hostt->skip_settle_delay)
+		if (!shost->hostt->skip_settle_delay)
 			ssleep(BUS_RESET_SETTLE_TIME);
-		spin_lock_irqsave(scmd->device->host->host_lock, flags);
-		scsi_report_bus_reset(scmd->device->host,
-				      scmd_channel(scmd));
-		spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+		spin_lock_irqsave(shost->host_lock, flags);
+		scsi_report_bus_reset(shost, scmd_channel(scmd));
+		spin_unlock_irqrestore(shost->host_lock, flags);
 	}
 
 	return rtn;
@@ -484,18 +485,19 @@ static void __scsi_report_device_reset(struct scsi_device *sdev, void *data)
  */
 static int scsi_try_target_reset(struct scsi_cmnd *scmd)
 {
+	struct Scsi_Host *shost = scmd->device->host;
 	unsigned long flags;
 	int rtn;
 
-	if (!scmd->device->host->hostt->eh_target_reset_handler)
+	if (!shost->hostt->eh_target_reset_handler)
 		return FAILED;
 
-	rtn = scmd->device->host->hostt->eh_target_reset_handler(scmd);
+	rtn = shost->hostt->eh_target_reset_handler(scmd);
 	if (rtn == SUCCESS) {
-		spin_lock_irqsave(scmd->device->host->host_lock, flags);
+		spin_lock_irqsave(shost->host_lock, flags);
 		__starget_for_each_device(scsi_target(scmd->device), NULL,
 					  __scsi_report_device_reset);
-		spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+		spin_unlock_irqrestore(shost->host_lock, flags);
 	}
 
 	return rtn;
@@ -513,12 +515,13 @@ static int scsi_try_target_reset(struct scsi_cmnd *scmd)
  */
 static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
 {
+	struct Scsi_Host *shost = scmd->device->host;
 	int rtn;
 
-	if (!scmd->device->host->hostt->eh_device_reset_handler)
+	if (!shost->hostt->eh_device_reset_handler)
 		return FAILED;
 
-	rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
+	rtn = shost->hostt->eh_device_reset_handler(scmd);
 	if (rtn == SUCCESS)
 		__scsi_report_device_reset(scmd->device, NULL);
 	return rtn;
@@ -526,10 +529,12 @@ static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
 
 static int __scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
 {
-	if (!scmd->device->host->hostt->eh_abort_handler)
+	struct Scsi_Host *shost = scmd->device->host;
+
+	if (!shost->hostt->eh_abort_handler)
 		return FAILED;
 
-	return scmd->device->host->hostt->eh_abort_handler(scmd);
+	return shost->hostt->eh_abort_handler(scmd);
 }
 
 /**




-- 
Jesper Juhl <jj@...osbits.net>             http://www.chaosbits.net/
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