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Subject: media: media/usb: Use kmemdup rather than duplicating its
implementation
Author: Fuqian Huang <huangfq.dax...@gmail.com>
Date: Wed Jul 3 13:28:57 2019 -0300
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.dax...@gmail.com>
Signed-off-by: Sean Young <s...@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
drivers/media/usb/em28xx/em28xx-cards.c | 3 +--
drivers/media/usb/zr364xx/zr364xx.c | 4 +---
2 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/drivers/media/usb/em28xx/em28xx-cards.c
b/drivers/media/usb/em28xx/em28xx-cards.c
index 1283c7ca9ad5..6e33782c3ca6 100644
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -3566,13 +3566,12 @@ static int em28xx_init_dev(struct em28xx *dev, struct
usb_device *udev,
static int em28xx_duplicate_dev(struct em28xx *dev)
{
int nr;
- struct em28xx *sec_dev = kzalloc(sizeof(*sec_dev), GFP_KERNEL);
+ struct em28xx *sec_dev = kmemdup(dev, sizeof(*sec_dev), GFP_KERNEL);
if (!sec_dev) {
dev->dev_next = NULL;
return -ENOMEM;
}
- memcpy(sec_dev, dev, sizeof(*sec_dev));
/* Check to see next free device and mark as used */
do {
nr = find_first_zero_bit(em28xx_devused, EM28XX_MAXBOARDS);
diff --git a/drivers/media/usb/zr364xx/zr364xx.c
b/drivers/media/usb/zr364xx/zr364xx.c
index b8e89d550d29..637962825d7a 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -197,12 +197,10 @@ static int send_control_msg(struct usb_device *udev, u8
request, u16 value,
{
int status;
- unsigned char *transfer_buffer = kmalloc(size, GFP_KERNEL);
+ unsigned char *transfer_buffer = kmemdup(cp, size, GFP_KERNEL);
if (!transfer_buffer)
return -ENOMEM;
- memcpy(transfer_buffer, cp, size);
-
status = usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
request,
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