[PATCH] usb: gadget: udc: atmel: Fix interrupt storm in FIFO mode.

[cristian.birsan]

From: Cristian Birsan <cristian.bir...@microchip.com>

Fix interrupt storm generated by endpoints when working in FIFO mode.
The TX_COMPLETE interrupt is used only by control endpoints processing.
Do not enable it for other types of endpoints.

Fixes: 914a3f3b3754 ("USB: add atmel_usba_udc driver")
Signed-off-by: Cristian Birsan <cristian.bir...@microchip.com>
---
 drivers/usb/gadget/udc/atmel_usba_udc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c 
b/drivers/usb/gadget/udc/atmel_usba_udc.c
index 86ffc8307864..1d0d8952a74b 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -449,9 +449,11 @@ static void submit_request(struct usba_ep *ep, struct 
usba_request *req)
                next_fifo_transaction(ep, req);
                if (req->last_transaction) {
                        usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
-                       usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
+                       if (ep_is_control(ep))
+                               usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
                } else {
-                       usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
+                       if (ep_is_control(ep))
+                               usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
                        usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
                }
        }
-- 
2.17.1