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USB: opticon: fix DMA from stack 

Make sure to allocate the control-message buffer dynamically as some
platforms cannot do DMA from stack.

Note that only the first byte of the old buffer was used.

Cc: <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2012-10-25 10:29:11 +02:00 committed by Greg Kroah-Hartman
parent 2f0295adf6
commit ea0dbebffe
1 changed files with 6 additions and 1 deletions
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7
drivers/usb/serial/opticon.c
View File

@ -155,7 +155,11 @@ static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
{
struct usb_serial *serial = port->serial;
int retval;
u8 buffer[2];
u8 *buffer;
buffer = kzalloc(1, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
buffer[0] = val;
/* Send the message to the vendor control endpoint
@ -164,6 +168,7 @@ static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
requesttype,
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
0, 0, buffer, 1, 0);
kfree(buffer);
return retval;
}