[nrf fromtree] drivers: udc_dwc2: Stop OUT transfers on ZLP

tmon-nordic · github-actions[bot] · commit e0deed4fab2a · 2025-02-10T13:15:52.000Z
The transfer is finished after ZLP is transmitted. Do not re-enable the endpoint waiting for more data. Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no> (cherry picked from commit ea72b27) (cherry picked from commit a82f2fc)
diff --git a/drivers/usb/udc/udc_dwc2.c b/drivers/usb/udc/udc_dwc2.c
@@ -2540,7 +2540,7 @@ static inline void dwc2_handle_out_xfercompl(const struct device *dev,
 		net_buf_add(buf, bcnt);
 	}
 
-	if (!is_iso && (bcnt % udc_mps_ep_size(ep_cfg)) == 0 &&
+	if (!is_iso && bcnt && (bcnt % udc_mps_ep_size(ep_cfg)) == 0 &&
 	    net_buf_tailroom(buf)) {
 		dwc2_prep_rx(dev, buf, ep_cfg);
 	} else {

Original file line number	Diff line number	Diff line change
`@@ -2540,7 +2540,7 @@ static inline void dwc2_handle_out_xfercompl(const struct device *dev,`
`2540`	`2540`	`net_buf_add(buf, bcnt);`
`2541`	`2541`	`}`
`2542`	`2542`
`2543`		`- if (!is_iso && (bcnt % udc_mps_ep_size(ep_cfg)) == 0 &&`
	`2543`	`+ if (!is_iso && bcnt && (bcnt % udc_mps_ep_size(ep_cfg)) == 0 &&`
`2544`	`2544`	`net_buf_tailroom(buf)) {`
`2545`	`2545`	`dwc2_prep_rx(dev, buf, ep_cfg);`
`2546`	`2546`	`} else {`