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* [PATCH] usb: gadget: udc: atmel: Fix interrupt storm in FIFO mode.
@ 2019-10-04 17:10 cristian.birsan
  0 siblings, 0 replies; only message in thread
From: cristian.birsan @ 2019-10-04 17:10 UTC (permalink / raw)
  To: balbi, gregkh, nicolas.ferre, alexandre.belloni, ludovic.desroches
  Cc: linux-arm-kernel, linux-usb, linux-kernel, Cristian Birsan

From: Cristian Birsan <>

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 <>
 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);

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2019-10-04 17:10 [PATCH] usb: gadget: udc: atmel: Fix interrupt storm in FIFO mode cristian.birsan

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