From 771560e5d341dc61f9e87bc715f3dbb4efe6ec62 Mon Sep 17 00:00:00 2001 From: Fuqian Huang Date: Wed, 3 Jul 2019 13:28:57 -0300 Subject: media: media/usb: 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 Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/em28xx/em28xx-cards.c | 3 +-- drivers/media/usb/zr364xx/zr364xx.c | 4 +--- 2 files changed, 2 insertions(+), 5 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index 1283c7ca9ad51..6e33782c3ca65 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 b8e89d550d295..637962825d7a8 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, -- cgit v1.2.3