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patch "usb: dwc3: gadget: Return proper request status" added to usb-linus

PATCH [email protected] 1 participant 1 message Apr 26, 2022

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Stable branch USB DesignWare USB3 DRD IP driver
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This is a note to let you know that I've just added the patch titled

usb: dwc3: gadget: Return proper request status

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From c7428dbddcf4ea1919e1c8e15f715b94ca359268 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <[email protected]>
Date: Fri, 22 Apr 2022 17:36:28 -0700
Subject: usb: dwc3: gadget: Return proper request status

If the user sets the usb_request's no_interrupt, then there will be no completion event for the request. Currently the driver incorrectly uses the event status of a different request to report the status for a request with no_interrupt. The dwc3 driver needs to check the TRB status associated with the request when reporting its status.

Note: this is only applicable to missed_isoc TRB completion status, but the other status are also listed for completeness/documentation.

Fixes 6d8a019614f3 ("usb: dwc3: gadget: check for Missed Isoc from event status")
Cc <[email protected]>
Signed-off-by Thinh Nguyen <[email protected]>
Link https://lore.kernel.org/r/db2c80108286cfd108adb05bad52138b78d7c3a7.1650673655.git.Thinh.Nguyen@synopsys.com open here
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/usb/dwc3/gadget.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)
drivers/usb/dwc3/gadget.c +30 -1
index ab725d2262d6..0b9c2493844a 100644
@@ -3274,6 +3274,7 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
 		const struct dwc3_event_depevt *event,
 		struct dwc3_request *req, int status)
 {
+	int request_status;
 	int ret;
 
 	if (req->request.num_mapped_sgs)

@@ -3294,7 +3295,35 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
 		req->needs_extra_trb = false;
 	}
 
-	dwc3_gadget_giveback(dep, req, status);
+	/*
+	 * The event status only reflects the status of the TRB with IOC set.
+	 * For the requests that don't set interrupt on completion, the driver
+	 * needs to check and return the status of the completed TRBs associated
+	 * with the request. Use the status of the last TRB of the request.
+	 */
+	if (req->request.no_interrupt) {
+		struct dwc3_trb *trb;
+
+		trb = dwc3_ep_prev_trb(dep, dep->trb_dequeue);
+		switch (DWC3_TRB_SIZE_TRBSTS(trb->size)) {
+		case DWC3_TRBSTS_MISSED_ISOC:
+			/* Isoc endpoint only */
+			request_status = -EXDEV;
+			break;
+		case DWC3_TRB_STS_XFER_IN_PROG:
+			/* Applicable when End Transfer with ForceRM=0 */
+		case DWC3_TRBSTS_SETUP_PENDING:
+			/* Control endpoint only */
+		case DWC3_TRBSTS_OK:
+		default:
+			request_status = 0;
+			break;
+		}
+	} else {
+		request_status = status;
+	}
+
+	dwc3_gadget_giveback(dep, req, request_status);
 
 out:
 	return ret;
Signature · 1 line
2.36.0