USB: kobil_sct: fix non-atomic allocation in write path

commit 19125283 upstream.

Write may be called from interrupt context so make sure to use
GFP_ATOMIC for all allocations in write.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>

drivers/usb/serial/kobil_sct.c

@@ -447,7 +447,7 @@ static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
 			);
 
 			priv->cur_pos = priv->cur_pos + length;
-			result = usb_submit_urb(port->write_urb, GFP_NOIO);
+			result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 			dbg("%s - port %d Send write URB returns: %i",
 					__func__, port->number, result);
 			todo = priv->filled - priv->cur_pos;
@@ -463,7 +463,7 @@ static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
 		if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
 			priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
 			result = usb_submit_urb(port->interrupt_in_urb,
-								GFP_NOIO);
+								GFP_ATOMIC);
 			dbg("%s - port %d Send read URB returns: %i",
 					__func__, port->number, result);
 		}