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watchdog: pcwd_usb: Use allocated buffer for usb_control_msg

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usb_control_msg() must use a dma-capable buffer.

This fixes the following error reported by smatch:

drivers/watchdog/pcwd_usb.c:257 usb_pcwd_send_command() error: doing dma on the
stack (buf)

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck 2013-10-14 09:29:34 -07:00 committed by Wim Van Sebroeck
parent b1f9cd3225
commit 5412df0bda
1 changed files with 7 additions and 1 deletions
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8
drivers/watchdog/pcwd_usb.c
View file

@ -235,13 +235,17 @@ static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
unsigned char cmd, unsigned char *msb, unsigned char *lsb)
{
int got_response, count;
unsigned char buf[6];
unsigned char *buf;
/* We will not send any commands if the USB PCWD device does
* not exist */
if ((!usb_pcwd) || (!usb_pcwd->exists))
return -1;
buf = kmalloc(6, GFP_KERNEL);
if (buf == NULL)
return 0;
/* The USB PC Watchdog uses a 6 byte report format.
* The board currently uses only 3 of the six bytes of the report. */
buf[0] = cmd; /* Byte 0 = CMD */
@ -277,6 +281,8 @@ static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
*lsb = usb_pcwd->cmd_data_lsb;
}
kfree(buf);
return got_response;
}