usb: gadget: udc: atmel: Fix vbus disconnect handling

commit 12b94da411f9c6d950beb067d913024fd5617a61 upstream.

A DMA transfer can be in progress while vbus is lost due to a cable
disconnect. For endpoints that use DMA, this condition can lead to
peripheral hang. The patch ensures that endpoints are disabled before
the clocks are stopped to prevent this issue.

Fixes: a64ef71ddc13 ("usb: gadget: atmel_usba_udc: condition clocks to vbus state")
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
index 1d0d8952a74bfa4a786c6966fff1bbcbc66438a7..58e5b015d40e648667a7466667b4fcce251dbd36 100644 (file)
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -1950,10 +1950,10 @@ static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
                        usba_start(udc);
                } else {
                        udc->suspended = false;
-                       usba_stop(udc);
-
                        if (udc->driver->disconnect)
                                udc->driver->disconnect(&udc->gadget);
+
+                       usba_stop(udc);
                }
                udc->vbus_prev = vbus;
        }