From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D6CF0CD6E74 for ; Fri, 5 Jun 2026 11:33:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/j9usojQrhGiMjx2wHcS8MnUEj9C4dvTS2jU4SvxVis=; b=RJpg+doa06zs18lUd/uZzHOBdI ZK0D7/RCX1A5o56Jztg7mJ+8RxuwDPEDaFZ0uF6X5Wqxpu/cS6dwcey1ftgfnjqKJ1Zx7LQE9np50 5JhYeqdq/kJxx6RBOJ0oSc0laqc8NzopNHJluth3zhdv+zOtWqmGtcBYdnbNfwaioU6ze3sn+70R6 fD2hs76eQuQMAK2CRz0CEMZnQQ7JK9FQexA9bz8KuAi4c/67XpZEpMf/UKPLekRVxejgoE3Ey8WiZ KiTRSCdavTrNWArtfpGePvg8t5BfYI/mgZxqDJfx5BploMBsK2g4KrZi4hy1Fzy1111fnt+jXDgHp Op3bvcRQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wVSni-00000000XdX-2Oza; Fri, 05 Jun 2026 11:33:22 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wVSnf-00000000XcL-2PMh for linux-mediatek@lists.infradead.org; Fri, 05 Jun 2026 11:33:20 +0000 X-UUID: 583842fc60d211f1acbe4559397dec65-20260605 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=/j9usojQrhGiMjx2wHcS8MnUEj9C4dvTS2jU4SvxVis=; b=gnNQpgMwJnEgH5VWXLuFoL9x6GYLlfYsgRLJ0rJ6Q5A/5dnHCbrookk6z4UTimxWZhwpxKmb5Z6Egtz5blXOLZzvOU767O63u2/QDs9c7/JTpn7wFkhuNqJ0HO4JF69yeEGx02yMMNpt4FVasKs/TAf5AQD1H8ibRHaQxOcvdrQ=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.15,REQID:37836c48-576d-467d-b30f-2ad19e158a6e,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:e276073,CLOUDID:87e2552a-13d2-4d29-83ea-b8014339a000,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|865|888|898,TC:-5,Cont ent:0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0 ,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 583842fc60d211f1acbe4559397dec65-20260605 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1751594370; Fri, 05 Jun 2026 04:33:16 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Fri, 5 Jun 2026 19:33:14 +0800 Received: from mussdccf250.eus.mediatek.inc (10.73.250.250) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Fri, 5 Jun 2026 19:33:13 +0800 From: Ryder Lee To: Felix Fietkau CC: , , Shayne Chen , Ryder Lee Subject: [PATCH 2/4] wifi: mt76: mt7921: fix potential tx_retries underflow Date: Fri, 5 Jun 2026 04:33:04 -0700 Message-ID: <20260605113306.3485554-2-ryder.lee@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260605113306.3485554-1-ryder.lee@mediatek.com> References: <20260605113306.3485554-1-ryder.lee@mediatek.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260605_043319_642687_A8578DBD X-CRM114-Status: UNSURE ( 9.56 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org When FIELD_GET returns 0 for the retry count, subtracting 1 causes an unsigned integer underflow, resulting in tx_retries becoming a very large value (0xFFFFFFFF for u32). Fix by checking if count is non-zero before subtracting 1. Fixes: 9aecfa754c7f ("wifi: mt76: mt7921e: report tx retries/failed counts in tx free event") Signed-off-by: Ryder Lee --- drivers/net/wireless/mediatek/mt76/mt7921/mac.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c index 03b4960db..668bfa195 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c @@ -530,8 +530,9 @@ static void mt7921_mac_tx_free(struct mt792x_dev *dev, void *data, int len) stat = FIELD_GET(MT_TX_FREE_STATUS, info); if (wcid) { - wcid->stats.tx_retries += - FIELD_GET(MT_TX_FREE_COUNT, info) - 1; + u32 count = FIELD_GET(MT_TX_FREE_COUNT, info); + + wcid->stats.tx_retries += count ? count - 1 : 0; wcid->stats.tx_failed += !!stat; } -- 2.45.2