linux-kernel - [PATCH 3.2 020/101] usb: dwc3: gadget: skip Set/Clear Halt when invalid

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Message-ID: <lsq.1496331655.265024548@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:40:55 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Felipe Balbi" <felipe.balbi@...ux.intel.com>
Subject: [PATCH 3.2 020/101] usb: dwc3: gadget: skip Set/Clear Halt when
 invalid

3.2.89-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Felipe Balbi <felipe.balbi@...ux.intel.com>

commit ffb80fc672c3a7b6afd0cefcb1524fb99917b2f3 upstream.

At least macOS seems to be sending
ClearFeature(ENDPOINT_HALT) to endpoints which
aren't Halted. This makes DWC3's CLEARSTALL command
time out which causes several issues for the driver.

Instead, let's just return 0 and bail out early.

Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -925,6 +925,9 @@ int __dwc3_gadget_ep_set_halt(struct dwc
 	memset(&params, 0x00, sizeof(params));
 
 	if (value) {
+		if (dep->flags & DWC3_EP_STALL)
+			return 0;
+
 		if (dep->number == 0 || dep->number == 1) {
 			/*
 			 * Whenever EP0 is stalled, we will restart
@@ -943,6 +946,9 @@ int __dwc3_gadget_ep_set_halt(struct dwc
 		else
 			dep->flags |= DWC3_EP_STALL;
 	} else {
+		if (!(dep->flags & DWC3_EP_STALL))
+			return 0;
+
 		ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
 			DWC3_DEPCMD_CLEARSTALL, &params);
 		if (ret)