linux-kernel - [PATCH v3] usb: dwc3: gadget: Simplify TRB reclaim logic by removing redundant 'chain' argument

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID:
 <AM8PR06MB752168CCAF31023017025DD5BC7BA@AM8PR06MB7521.eurprd06.prod.outlook.com>
Date: Wed, 25 Jun 2025 07:53:17 +0000
From: SCHNEIDER Johannes <johannes.schneider@...ca-geosystems.com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, "linux-usb@...r.kernel.org"
	<linux-usb@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, GEO-CHHER-bsp-development
	<bsp-development.geo@...ca-geosystems.com>
Subject: [PATCH v3] usb: dwc3: gadget: Simplify TRB reclaim logic by removing
 redundant 'chain' argument

Now that the TRB reclaim logic always inspects the TRB's CHN (Chain) bit
directly to determine whether a TRB is part of a chain, the explicit
'chain' parameter passed into dwc3_gadget_ep_reclaim_completed_trb()
is no longer necessary.

This cleanup simplifies the reclaim code by avoiding duplication of
chain state tracking, and makes the reclaim logic rely entirely on the
hardware descriptor flags — which are already present and accurate at
this stage.

No functional changes intended.

Signed-off-by: Johannes Schneider <johannes.schneider@...ca-geosystems.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
---
v3: no changes, re-submission as single patch
v2: no changes to the patch, "faulty" re-submission
v1: initial submission as part of a series
Link: https://lore.kernel.org/lkml/AM8PR06MB7521CFF1CD8A93622A537EEDBC78A@AM8PR06MB7521.eurprd06.prod.outlook.com/

 drivers/usb/dwc3/gadget.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 99fbd29d8f46..a4a2bf273f94 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3497,7 +3497,7 @@ static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
 
 static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
 		struct dwc3_request *req, struct dwc3_trb *trb,
-		const struct dwc3_event_depevt *event, int status, int chain)
+		const struct dwc3_event_depevt *event, int status)
 {
 	unsigned int		count;
 
@@ -3549,7 +3549,8 @@ static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
 	if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
 		return 1;
 
-	if (event->status & DEPEVT_STATUS_SHORT && !chain)
+	if (event->status & DEPEVT_STATUS_SHORT &&
+	    !(trb->ctrl & DWC3_TRB_CTRL_CHN))
 		return 1;
 
 	if ((trb->ctrl & DWC3_TRB_CTRL_ISP_IMI) &&
@@ -3576,8 +3577,7 @@ static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
 		trb = &dep->trb_pool[dep->trb_dequeue];
 
 		ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
-				trb, event, status,
-				!!(trb->ctrl & DWC3_TRB_CTRL_CHN));
+				trb, event, status);
 		if (ret)
 			break;
 	}
-- 
2.43.0