Commit 5412df0b authored by Guenter Roeck's avatar Guenter Roeck Committed by Wim Van Sebroeck

watchdog: pcwd_usb: Use allocated buffer for usb_control_msg

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: default avatarGuenter Roeck <linux@roeck-us.net>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent b1f9cd32
...@@ -235,13 +235,17 @@ static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, ...@@ -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) unsigned char cmd, unsigned char *msb, unsigned char *lsb)
{ {
int got_response, count; int got_response, count;
unsigned char buf[6]; unsigned char *buf;
/* We will not send any commands if the USB PCWD device does /* We will not send any commands if the USB PCWD device does
* not exist */ * not exist */
if ((!usb_pcwd) || (!usb_pcwd->exists)) if ((!usb_pcwd) || (!usb_pcwd->exists))
return -1; return -1;
buf = kmalloc(6, GFP_KERNEL);
if (buf == NULL)
return 0;
/* The USB PC Watchdog uses a 6 byte report format. /* The USB PC Watchdog uses a 6 byte report format.
* The board currently uses only 3 of the six bytes of the report. */ * The board currently uses only 3 of the six bytes of the report. */
buf[0] = cmd; /* Byte 0 = CMD */ buf[0] = cmd; /* Byte 0 = CMD */
...@@ -277,6 +281,8 @@ static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, ...@@ -277,6 +281,8 @@ static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
*lsb = usb_pcwd->cmd_data_lsb; *lsb = usb_pcwd->cmd_data_lsb;
} }
kfree(buf);
return got_response; return got_response;
} }
......
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