linux-kernel - [PATCH 5.13 002/151] Revert "usb: dwc3: gadget: Use list_replace

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Date:   Mon, 16 Aug 2021 15:00:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        John Stultz <john.stultz@...aro.org>,
        Ray Chi <raychi@...gle.com>, Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <wcheng@...eaurora.org>
Subject: [PATCH 5.13 002/151] Revert "usb: dwc3: gadget: Use list_replace_init() before traversing lists"

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit 664cc971fb259007e49cc8a3ac43b0787d89443f upstream.

This reverts commit d25d85061bd856d6be221626605319154f9b5043 as it is
reported to cause problems on many different types of boards.

Reported-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Reported-by: John Stultz <john.stultz@...aro.org>
Cc: Ray Chi <raychi@...gle.com>
Link: https://lore.kernel.org/r/CANcMJZCEVxVLyFgLwK98hqBEdc0_n4P0x_K6Gih8zNH3ouzbJQ@mail.gmail.com
Fixes: d25d85061bd8 ("usb: dwc3: gadget: Use list_replace_init() before traversing lists")
Cc: stable <stable@...r.kernel.org>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Wesley Cheng <wcheng@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/gadget.c |   18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1741,13 +1741,9 @@ static void dwc3_gadget_ep_cleanup_cance
 {
 	struct dwc3_request		*req;
 	struct dwc3_request		*tmp;
-	struct list_head		local;
 	struct dwc3			*dwc = dep->dwc;
 
-restart:
-	list_replace_init(&dep->cancelled_list, &local);
-
-	list_for_each_entry_safe(req, tmp, &local, list) {
+	list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) {
 		dwc3_gadget_ep_skip_trbs(dep, req);
 		switch (req->status) {
 		case DWC3_REQUEST_STATUS_DISCONNECTED:
@@ -1765,9 +1761,6 @@ restart:
 			break;
 		}
 	}
-
-	if (!list_empty(&dep->cancelled_list))
-		goto restart;
 }
 
 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
@@ -2963,12 +2956,8 @@ static void dwc3_gadget_ep_cleanup_compl
 {
 	struct dwc3_request	*req;
 	struct dwc3_request	*tmp;
-	struct list_head	local;
 
-restart:
-	list_replace_init(&dep->started_list, &local);
-
-	list_for_each_entry_safe(req, tmp, &local, list) {
+	list_for_each_entry_safe(req, tmp, &dep->started_list, list) {
 		int ret;
 
 		ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
@@ -2976,9 +2965,6 @@ restart:
 		if (ret)
 			break;
 	}
-
-	if (!list_empty(&dep->started_list))
-		goto restart;
 }
 
 static bool dwc3_gadget_ep_should_continue(struct dwc3_ep *dep)