linux-kernel - [PATCH 5.10 005/121] usb: dwc2: gadget: Fix ISOC flow for elapsed frames

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Date:   Mon, 29 Nov 2021 19:17:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, John Keeping <john@...anate.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Subject: [PATCH 5.10 005/121] usb: dwc2: gadget: Fix ISOC flow for elapsed frames

From: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>

commit 7ad4a0b1d46b2612f4429a72afd8f137d7efa9a9 upstream.

Added updating of request frame number for elapsed frames,
otherwise frame number will remain as previous use of request.
This will allow function driver to correctly track frames in
case of Missed ISOC occurs.

Added setting request actual length to 0 for elapsed frames.
In Slave mode when pushing data to RxFIFO by dwords, request
actual length incrementing accordingly. But before whole packet
will be pushed into RxFIFO and send to host can occurs Missed
ISOC and data will not send to host. So, in this case request
actual length should be reset to 0.

Fixes: 91bb163e1e4f ("usb: dwc2: gadget: Fix ISOC flow for BDMA and Slave")
Cc: stable <stable@...r.kernel.org>
Reviewed-by: John Keeping <john@...anate.com>
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Link: https://lore.kernel.org/r/c356baade6e9716d312d43df08d53ae557cb8037.1636011277.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc2/gadget.c |   17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -1198,6 +1198,8 @@ static void dwc2_hsotg_start_req(struct
 			}
 			ctrl |= DXEPCTL_CNAK;
 		} else {
+			hs_req->req.frame_number = hs_ep->target_frame;
+			hs_req->req.actual = 0;
 			dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA);
 			return;
 		}
@@ -2856,9 +2858,12 @@ static void dwc2_gadget_handle_ep_disabl
 
 	do {
 		hs_req = get_ep_head(hs_ep);
-		if (hs_req)
+		if (hs_req) {
+			hs_req->req.frame_number = hs_ep->target_frame;
+			hs_req->req.actual = 0;
 			dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req,
 						    -ENODATA);
+		}
 		dwc2_gadget_incr_frame_num(hs_ep);
 		/* Update current frame number value. */
 		hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg);
@@ -2911,8 +2916,11 @@ static void dwc2_gadget_handle_out_token
 
 	while (dwc2_gadget_target_frame_elapsed(ep)) {
 		hs_req = get_ep_head(ep);
-		if (hs_req)
+		if (hs_req) {
+			hs_req->req.frame_number = ep->target_frame;
+			hs_req->req.actual = 0;
 			dwc2_hsotg_complete_request(hsotg, ep, hs_req, -ENODATA);
+		}
 
 		dwc2_gadget_incr_frame_num(ep);
 		/* Update current frame number value. */
@@ -3001,8 +3009,11 @@ static void dwc2_gadget_handle_nak(struc
 
 	while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
 		hs_req = get_ep_head(hs_ep);
-		if (hs_req)
+		if (hs_req) {
+			hs_req->req.frame_number = hs_ep->target_frame;
+			hs_req->req.actual = 0;
 			dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA);
+		}
 
 		dwc2_gadget_incr_frame_num(hs_ep);
 		/* Update current frame number value. */