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authorGuenter Roeck <linux@roeck-us.net>2013-10-14 09:29:34 -0700
committerWim Van Sebroeck <wim@iguana.be>2013-11-17 19:37:48 +0100
commit5412df0bda90a2bdcef2771849ad5472b9ef8100 (patch)
tree6f6d0bd0b63757971222628dd10bd23307b54953
parentb1f9cd3225ae2e8626fe7503ae7be92240873049 (diff)
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: Guenter Roeck <linux@roeck-us.net> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
-rw-r--r--drivers/watchdog/pcwd_usb.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
index 7b14d1847927..115a0ebebf4a 100644
--- a/drivers/watchdog/pcwd_usb.c
+++ b/drivers/watchdog/pcwd_usb.c
@@ -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;
}