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

commit 191252837626fca0de694c18bb2aa64c118eda89 upstream.

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

Fixes: 1da177e4c3f4 ("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>

diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 4a9a75e..c3a53ac 100644 (file)
--- a/drivers/usb/serial/kobil_sct.c
+++ b/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);
                }