[PATCH 10] drivers/block/cpqarray.c: better error handling and kmalloc + memset conversion to k[cz]alloc

[Mariusz Kozlowski]

This patch removes some redundant casts, does the kmalloc + memset to k[cz]alloc conversion
and it changes the error path to use goto (to avoid code duplication).

Signed-off-by: Mariusz Kozlowski <m.kozlowski@xxxxxxxxxx>

 drivers/block/cpqarray.c | 49567 -> 48623 (-944 bytes)
 drivers/block/cpqarray.o | 178820 -> 178288 (-532 bytes)

 drivers/block/cpqarray.c |   78 ++++++++++++-------------------------
 1 file changed, 26 insertions(+), 52 deletions(-)

--- linux-2.6.23-rc1-mm1-a/drivers/block/cpqarray.c	2007-07-26 13:07:41.000000000 +0200
+++ linux-2.6.23-rc1-mm1-b/drivers/block/cpqarray.c	2007-07-31 12:59:54.000000000 +0200
@@ -420,18 +420,17 @@ static int __init cpqarray_register_ctlr
 			goto Enomem2;
 	}

-	hba[i]->cmd_pool = (cmdlist_t *)pci_alloc_consistent(
+	hba[i]->cmd_pool = pci_alloc_consistent(
 		hba[i]->pci_dev, NR_CMDS * sizeof(cmdlist_t),
 		&(hba[i]->cmd_pool_dhandle));
-	hba[i]->cmd_pool_bits = kmalloc(
-		((NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG)*sizeof(unsigned long),
+	hba[i]->cmd_pool_bits = kcalloc(
+		(NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG, sizeof(unsigned long),
 		GFP_KERNEL);

 	if (!hba[i]->cmd_pool_bits || !hba[i]->cmd_pool)
 			goto Enomem1;

 	memset(hba[i]->cmd_pool, 0, NR_CMDS * sizeof(cmdlist_t));
-	memset(hba[i]->cmd_pool_bits, 0, ((NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG)*sizeof(unsigned long));
 	printk(KERN_INFO "cpqarray: Finding drives on %s",
 		hba[i]->devname);

@@ -1660,45 +1659,30 @@ static void getgeometry(int ctlr)

 	info_p->log_drv_map = 0;

-	id_ldrive = kmalloc(sizeof(id_log_drv_t), GFP_KERNEL);
-	if(id_ldrive == NULL)
-	{
+	id_ldrive = kzalloc(sizeof(id_log_drv_t), GFP_KERNEL);
+	if (!id_ldrive)	{
 		printk( KERN_ERR "cpqarray:  out of memory.\n");
-		return;
+		goto err_0;
 	}

-	id_ctlr_buf = kmalloc(sizeof(id_ctlr_t), GFP_KERNEL);
-	if(id_ctlr_buf == NULL)
-	{
-		kfree(id_ldrive);
+	id_ctlr_buf = kzalloc(sizeof(id_ctlr_t), GFP_KERNEL);
+	if (!id_ctlr_buf) {
 		printk( KERN_ERR "cpqarray:  out of memory.\n");
-		return;
+		goto err_1;
 	}

-	id_lstatus_buf = kmalloc(sizeof(sense_log_drv_stat_t), GFP_KERNEL);
-	if(id_lstatus_buf == NULL)
-	{
-		kfree(id_ctlr_buf);
-		kfree(id_ldrive);
+	id_lstatus_buf = kzalloc(sizeof(sense_log_drv_stat_t), GFP_KERNEL);
+	if (!id_lstatus_buf) {
 		printk( KERN_ERR "cpqarray:  out of memory.\n");
-		return;
+		goto err_2;
 	}

-	sense_config_buf = kmalloc(sizeof(config_t), GFP_KERNEL);
-	if(sense_config_buf == NULL)
-	{
-		kfree(id_lstatus_buf);
-		kfree(id_ctlr_buf);
-		kfree(id_ldrive);
+	sense_config_buf = kzalloc(sizeof(config_t), GFP_KERNEL);
+	if (!sense_config_buf) {
 		printk( KERN_ERR "cpqarray:  out of memory.\n");
-		return;
+		goto err_3;
 	}

-	memset(id_ldrive, 0, sizeof(id_log_drv_t));
-	memset(id_ctlr_buf, 0, sizeof(id_ctlr_t));
-	memset(id_lstatus_buf, 0, sizeof(sense_log_drv_stat_t));
-	memset(sense_config_buf, 0, sizeof(config_t));
-
 	info_p->phys_drives = 0;
 	info_p->log_drv_map = 0;
 	info_p->drv_assign_map = 0;
@@ -1712,13 +1696,8 @@ static void getgeometry(int ctlr)
 		 * so the idastubopen will fail on all logical drives
 		 * on the controller.
 		 */
-		 /* Free all the buffers and return */
 		printk(KERN_ERR "cpqarray: error sending ID controller\n");
-		kfree(sense_config_buf);
-                kfree(id_lstatus_buf);
-                kfree(id_ctlr_buf);
-                kfree(id_ldrive);
-                return;
+                goto err_4;
         }

 	info_p->log_drives = id_ctlr_buf->nr_drvs;
@@ -1764,12 +1743,7 @@ static void getgeometry(int ctlr)
 				" failed to report status of logical drive %d\n"
 			 "Access to this controller has been disabled\n",
 				ctlr, log_unit);
-			/* Free all the buffers and return */
-                	kfree(sense_config_buf);
-                	kfree(id_lstatus_buf);
-                	kfree(id_ctlr_buf);
-                	kfree(id_ldrive);
-                	return;
+                	goto err_4;
 		}
 		/*
 		   Make sure the logical drive is configured
@@ -1798,14 +1772,8 @@ static void getgeometry(int ctlr)
 				 sizeof(config_t), 0, 0, log_unit);
 				if (ret_code == IO_ERROR) {
 					info_p->log_drv_map = 0;
-					/* Free all the buffers and return */
                 			printk(KERN_ERR "cpqarray: error sending sense config\n");
-                			kfree(sense_config_buf);
-                			kfree(id_lstatus_buf);
-                			kfree(id_ctlr_buf);
-                			kfree(id_ldrive);
-                			return;
-
+                			goto err_4;
 				}

 				info_p->phys_drives =
@@ -1820,12 +1788,18 @@ static void getgeometry(int ctlr)
 			log_index = log_index + 1;
 		}		/* end of if logical drive configured */
 	}			/* end of for log_unit */
+
+	/* Free all the buffers and return */
+err_4:
 	kfree(sense_config_buf);
-  	kfree(id_ldrive);
+err_3:
   	kfree(id_lstatus_buf);
+err_2:
 	kfree(id_ctlr_buf);
+err_1:
+  	kfree(id_ldrive);
+err_0:
 	return;
-
 }

 static void __exit cpqarray_exit(void)
-
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