USB: cypress_m8: fix potential scheduling while atomic

Remove erroneous call to usb_clear_halt which is blocking and cannot be
used in interrupt context.

This code has possibly never been executed as it would cause an oops if
it was. Simply treat a stalled-endpoint error as any other error
condition.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

1 files changed, 3 insertions, 16 deletions

diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index bccb1223143a..634f0d6605ed 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -1224,7 +1224,6 @@ static void cypress_write_int_callback(struct urb *urb)
         struct usb_serial_port *port = urb->context;
         struct cypress_private *priv = usb_get_serial_port_data(port);
         struct device *dev = &urb->dev->dev;
-        int result;
         int status = urb->status;
 
         switch (status) {
@@ -1239,21 +1238,9 @@ static void cypress_write_int_callback(struct urb *urb)
                         __func__, status);
                 priv->write_urb_in_use = 0;
                 return;
-        case -EPIPE: /* no break needed; clear halt and resubmit */
-                if (!priv->comm_is_ok)
-                        break;
-                usb_clear_halt(port->serial->dev, 0x02);
-                /* error in the urb, so we have to resubmit it */
-                dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
-                        __func__, status);
-                port->interrupt_out_urb->transfer_buffer_length = 1;
-                result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
-                if (!result)
-                        return;
-                dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
-                        __func__, result);
-                cypress_set_dead(port);
-                break;
+        case -EPIPE:
+                /* Cannot call usb_clear_halt while in_interrupt */
+                /* FALLTHROUGH */
         default:
                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
                         __func__, status);