linux-kernel - [PATCH] scsi: fnic: Use a variable for repeated mem

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Date:   Wed, 11 Jan 2023 23:56:31 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     Satish Kharat <satishkh@...co.com>,
        Sesidhar Baddela <sebaddel@...co.com>,
        Karan Tilak Kumar <kartilak@...co.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>
Subject: [PATCH] scsi: fnic: Use a variable for repeated mem_size computation

Use a variable to upfront compute memory size to be allocated,
instead of repeatedly computing it at different instructions.
The reduced instruction length also allows to tidy up the code.
Issue identified using the array_size_dup Coccinelle semantic
patch.

Signed-off-by: Deepak R Varma <drv@...lo.com>
---
 drivers/scsi/fnic/fnic_trace.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/fnic/fnic_trace.c b/drivers/scsi/fnic/fnic_trace.c
index e03967463561..7b8ef74fc060 100644
--- a/drivers/scsi/fnic/fnic_trace.c
+++ b/drivers/scsi/fnic/fnic_trace.c
@@ -544,12 +544,10 @@ int fnic_fc_trace_init(void)
 	unsigned long fc_trace_buf_head;
 	int err = 0;
 	int i;
+	size_t mem_sz = array_size(PAGE_SIZE, fnic_fc_trace_max_pages);
 
-	fc_trace_max_entries = (fnic_fc_trace_max_pages * PAGE_SIZE)/
-				FC_TRC_SIZE_BYTES;
-	fnic_fc_ctlr_trace_buf_p =
-		(unsigned long)vmalloc(array_size(PAGE_SIZE,
-						  fnic_fc_trace_max_pages));
+	fc_trace_max_entries = mem_sz / FC_TRC_SIZE_BYTES;
+	fnic_fc_ctlr_trace_buf_p = (unsigned long)vmalloc(mem_sz);
 	if (!fnic_fc_ctlr_trace_buf_p) {
 		pr_err("fnic: Failed to allocate memory for "
 		       "FC Control Trace Buf\n");
@@ -557,13 +555,11 @@ int fnic_fc_trace_init(void)
 		goto err_fnic_fc_ctlr_trace_buf_init;
 	}
 
-	memset((void *)fnic_fc_ctlr_trace_buf_p, 0,
-			fnic_fc_trace_max_pages * PAGE_SIZE);
+	memset((void *)fnic_fc_ctlr_trace_buf_p, 0, mem_sz);
 
 	/* Allocate memory for page offset */
-	fc_trace_entries.page_offset =
-		vmalloc(array_size(fc_trace_max_entries,
-				   sizeof(unsigned long)));
+	mem_sz = array_size(fc_trace_max_entries, sizeof(unsigned long));
+	fc_trace_entries.page_offset = vmalloc(mem_sz);
 	if (!fc_trace_entries.page_offset) {
 		pr_err("fnic:Failed to allocate memory for page_offset\n");
 		if (fnic_fc_ctlr_trace_buf_p) {
@@ -574,8 +570,7 @@ int fnic_fc_trace_init(void)
 		err = -ENOMEM;
 		goto err_fnic_fc_ctlr_trace_buf_init;
 	}
-	memset((void *)fc_trace_entries.page_offset, 0,
-	       (fc_trace_max_entries * sizeof(unsigned long)));
+	memset((void *)fc_trace_entries.page_offset, 0, mem_sz);
 
 	fc_trace_entries.rd_idx = fc_trace_entries.wr_idx = 0;
 	fc_trace_buf_head = fnic_fc_ctlr_trace_buf_p;
-- 
2.34.1