From 5412df0bda90a2bdcef2771849ad5472b9ef8100 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Mon, 14 Oct 2013 09:29:34 -0700 Subject: [PATCH] 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 Acked-by: Greg Kroah-Hartman Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/pcwd_usb.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) 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; } -- 2.20.1