linux-kernel - [PATCH 4/4] SCSI-QLA4...: Less function calls in qla4xxx_sysfs_ddb

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Date:	Fri, 06 Feb 2015 23:17:51 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	"James E. J. Bottomley" <JBottomley@...allels.com>,
	QLogic-Storage-Upstream@...gic.com, linux-scsi@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 4/4] SCSI-QLA4...: Less function calls in qla4xxx_sysfs_ddb_logout()
 after error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 6 Feb 2015 22:44:23 +0100

The vfree() function was called in three cases by the qla4xxx_sysfs_ddb_logout()
function during error handling even if the passed variables "flash_tddb" and
"tmp_tddb" contained still a null pointer.

* This implementation detail could be improved by adjustments for jump labels.

* Let us return immediately after the first failed function call according to
  the current Linux coding style convention.

* Delete also an unnecessary check for the variable "fw_ddb_entry" there.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/scsi/qla4xxx/ql4_os.c | 35 +++++++++++++++++------------------
 1 file changed, 17 insertions(+), 18 deletions(-)

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index e508bc9..802390b 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -7699,23 +7699,22 @@ static int qla4xxx_sysfs_ddb_logout(struct iscsi_bus_flash_session *fnode_sess,
 {
 	struct Scsi_Host *shost = iscsi_flash_session_to_shost(fnode_sess);
 	struct scsi_qla_host *ha = to_qla_host(shost);
-	struct ql4_tuple_ddb *flash_tddb = NULL;
-	struct ql4_tuple_ddb *tmp_tddb = NULL;
-	struct dev_db_entry *fw_ddb_entry = NULL;
-	struct ddb_entry *ddb_entry = NULL;
 	dma_addr_t fw_ddb_dma;
 	uint32_t next_idx = 0;
 	uint32_t state = 0, conn_err = 0;
 	uint16_t conn_id = 0;
 	int idx, index;
 	int status, ret = 0;
+	struct ql4_tuple_ddb *flash_tddb;
+	struct ql4_tuple_ddb *tmp_tddb;
+	struct ddb_entry *ddb_entry;
+	struct dev_db_entry *fw_ddb_entry = dma_pool_alloc(ha->fw_ddb_dma_pool,
+								GFP_KERNEL,
+								&fw_ddb_dma);
 
-	fw_ddb_entry = dma_pool_alloc(ha->fw_ddb_dma_pool, GFP_KERNEL,
-				      &fw_ddb_dma);
-	if (fw_ddb_entry == NULL) {
+	if (!fw_ddb_entry) {
 		ql4_printk(KERN_ERR, ha, "%s:Out of memory\n", __func__);
-		ret = -ENOMEM;
-		goto exit_ddb_logout;
+		return -ENOMEM;
 	}
 
 	flash_tddb = vzalloc(sizeof(*flash_tddb));
@@ -7723,7 +7722,7 @@ static int qla4xxx_sysfs_ddb_logout(struct iscsi_bus_flash_session *fnode_sess,
 		ql4_printk(KERN_WARNING, ha,
 			   "%s:Memory Allocation failed.\n", __func__);
 		ret = -ENOMEM;
-		goto exit_ddb_logout;
+		goto free_pool;
 	}
 
 	tmp_tddb = vzalloc(sizeof(*tmp_tddb));
@@ -7731,7 +7730,7 @@ static int qla4xxx_sysfs_ddb_logout(struct iscsi_bus_flash_session *fnode_sess,
 		ql4_printk(KERN_WARNING, ha,
 			   "%s:Memory Allocation failed.\n", __func__);
 		ret = -ENOMEM;
-		goto exit_ddb_logout;
+		goto free_flash;
 	}
 
 	if (!fnode_sess->targetname) {
@@ -7739,7 +7738,7 @@ static int qla4xxx_sysfs_ddb_logout(struct iscsi_bus_flash_session *fnode_sess,
 			   "%s:Cannot logout from SendTarget entry\n",
 			   __func__);
 		ret = -EPERM;
-		goto exit_ddb_logout;
+		goto free_tmp;
 	}
 
 	if (fnode_sess->is_boot_target) {
@@ -7747,7 +7746,7 @@ static int qla4xxx_sysfs_ddb_logout(struct iscsi_bus_flash_session *fnode_sess,
 			   "%s: Logout from boot target entry is not permitted.\n",
 			   __func__);
 		ret = -EPERM;
-		goto exit_ddb_logout;
+		goto free_tmp;
 	}
 
 	strlcpy(flash_tddb->iscsi_name, fnode_sess->targetname,
@@ -7794,12 +7793,12 @@ static int qla4xxx_sysfs_ddb_logout(struct iscsi_bus_flash_session *fnode_sess,
 	if (idx == MAX_DDB_ENTRIES)
 		ret = -ESRCH;
 
-exit_ddb_logout:
-	vfree(flash_tddb);
+free_tmp:
 	vfree(tmp_tddb);
-	if (fw_ddb_entry)
-		dma_pool_free(ha->fw_ddb_dma_pool, fw_ddb_entry, fw_ddb_dma);
-
+free_flash:
+	vfree(flash_tddb);
+free_pool:
+	dma_pool_free(ha->fw_ddb_dma_pool, fw_ddb_entry, fw_ddb_dma);
 	return ret;
 }
 
-- 
2.2.2

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