linux-kernel - [PATCH v2 16/35] net/wimax: Use kmemdup rather than duplicating its implementation

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Message-Id: <20190703162923.32599-1-huangfq.daxian@gmail.com>
Date:   Thu,  4 Jul 2019 00:29:23 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
        linux-wimax@...el.com, "David S . Miller" <davem@...emloft.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH v2 16/35] net/wimax: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
Changes in v2:
  - Fix a typo in commit message (memset -> memcpy)

 drivers/net/wimax/i2400m/usb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index 2075e7b1fff6..cdce6c47c444 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -155,12 +155,11 @@ int __i2400mu_send_barker(struct i2400mu *i2400mu,
 		do_autopm = 0;
 	}
 	ret = -ENOMEM;
-	buffer = kmalloc(barker_size, GFP_KERNEL);
+	buffer = kmemdup(barker, barker_size, GFP_KERNEL);
 	if (buffer == NULL)
 		goto error_kzalloc;
 	epd = usb_get_epd(i2400mu->usb_iface, endpoint);
 	pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
-	memcpy(buffer, barker, barker_size);
 retry:
 	ret = usb_bulk_msg(i2400mu->usb_dev, pipe, buffer, barker_size,
 			   &actual_len, 200);
-- 
2.11.0