diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2013-10-14 20:29:34 +0400 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2013-11-17 22:37:48 +0400 |
| commit | 5412df0bda90a2bdcef2771849ad5472b9ef8100 (patch) | |
| tree | 6f6d0bd0b63757971222628dd10bd23307b54953 | |
| parent | b1f9cd3225ae2e8626fe7503ae7be92240873049 (diff) | |
| download | linux-5412df0bda90a2bdcef2771849ad5472b9ef8100.tar.xz | |
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.c | 8 |
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; } |