From nobody Sun Feb 8 22:01:12 2026 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 49B28364E85; Tue, 20 Jan 2026 07:21:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768893702; cv=none; b=VdXL7B+W5ZaeWD0xstomifGZ0j0doadt7/JOLsZ1aZImbNHJWmXodxRzCaO7q3Phw6pxiBvwIjp0CrM4rdTjD2YwncvEXtSunUp1e2bwTTh+H5AkIFNOkB+ZN0Be3ay6ksDywbZYmZr38fz7slsRq4DeHXngsxJSpJOXnKXQCqE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768893702; c=relaxed/simple; bh=p8cAsH+U0zreVFn8XkbRD0x58b2kMBRfvTpcETKZl5w=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=lkXlsPGYNeWAWqjBTv5JotPZ1vF+HBvMxHX+s/2dv1k2Doy73TsD+KiGVsZy1kIyuJ/fMJKw8VakdJjXvwuswwb9Y4bH6t4/9rVzyLZGn+Ucg7t3MMfZGKwGqd3E2Wi0Vie2fK1S6ShjWCQ//6wUof/Xoi6W1S+UGJDwMfrAq7M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=hEdU2e7n; arc=none smtp.client-ip=117.135.210.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="hEdU2e7n" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Fn 8sH/UPGAA1+BoMne6Uvp98j9WI73paMY45+Og8aWs=; b=hEdU2e7ngBfssFCG2O Vh6rK9A6lE03kYCxhIHmuUaZ8JLsY91aVSGIS4oWHYXufaWNgipoZPgH8OxERnkY TugTe6lSk0okFt0fVAWDtqFcrrnkaa76TJsOBc0E6WOQi6UA5lc5WhiDxFT4bhlB 9PlUxBdXFerSvHn5J5K33EmZc= Received: from localhost.localdomain (unknown []) by gzga-smtp-mtada-g0-2 (Coremail) with SMTP id _____wD3P_e4LG9pP7D_Hw--.20586S2; Tue, 20 Jan 2026 15:20:26 +0800 (CST) From: Slark Xiao To: loic.poulain@oss.qualcomm.com, ryazanov.s.a@gmail.com, johannes@sipsolutions.net, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, gustavoars@kernel.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Slark Xiao Subject: [net] Revert "net: wwan: mhi_wwan_mbim: Avoid -Wflex-array-member-not-at-end warning" Date: Tue, 20 Jan 2026 15:20:18 +0800 Message-Id: <20260120072018.29375-1-slark_xiao@163.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wD3P_e4LG9pP7D_Hw--.20586S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxArWUXw48Kw15Jw4fWr1UAwb_yoW5Zw4UpF 4jk3yFvr4kGw1UWw4UAF4fZFWaqwn7K34Iy34Y9a4FqFnxtr15GFy8uFyrCrWYkayDuF13 tFWUKF45ZF1kWw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pRiYFJUUUUU= X-CM-SenderInfo: xvod2y5b0lt0i6rwjhhfrp/xtbC5xpv02lvLLqyyQAA3q Content-Type: text/plain; charset="utf-8" This reverts commit eeecf5d3a3a484cedfa3f2f87e6d51a7390ed960. This change lead to MHI WWAN device can't connect to internet. I found a netwrok issue with kernel 6.19-rc4, but network works well with kernel 6.18-rc1. After checking, this commit is the root cause. Before appliing this serial changes on MHI WWAN network, we shall revert this change in case of v6.19 being impacted. Fixes: eeecf5d3a3a4 ("net: wwan: mhi_wwan_mbim: Avoid -Wflex-array-member-n= ot-at-end warning") Signed-off-by: Slark Xiao --- drivers/net/wwan/mhi_wwan_mbim.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/drivers/net/wwan/mhi_wwan_mbim.c b/drivers/net/wwan/mhi_wwan_m= bim.c index cf6d3e2a007b..1d7e3ad900c1 100644 --- a/drivers/net/wwan/mhi_wwan_mbim.c +++ b/drivers/net/wwan/mhi_wwan_mbim.c @@ -78,9 +78,8 @@ struct mhi_mbim_context { =20 struct mbim_tx_hdr { struct usb_cdc_ncm_nth16 nth16; - - /* Must be last as it ends in a flexible-array member. */ struct usb_cdc_ncm_ndp16 ndp16; + struct usb_cdc_ncm_dpe16 dpe16[2]; } __packed; =20 static struct mhi_mbim_link *mhi_mbim_get_link_rcu(struct mhi_mbim_context= *mbim, @@ -109,20 +108,20 @@ static int mhi_mbim_get_link_mux_id(struct mhi_contro= ller *cntrl) static struct sk_buff *mbim_tx_fixup(struct sk_buff *skb, unsigned int ses= sion, u16 tx_seq) { - DEFINE_RAW_FLEX(struct mbim_tx_hdr, mbim_hdr, ndp16.dpe16, 2); unsigned int dgram_size =3D skb->len; struct usb_cdc_ncm_nth16 *nth16; struct usb_cdc_ncm_ndp16 *ndp16; + struct mbim_tx_hdr *mbim_hdr; =20 /* Only one NDP is sent, containing the IP packet (no aggregation) */ =20 /* Ensure we have enough headroom for crafting MBIM header */ - if (skb_cow_head(skb, __struct_size(mbim_hdr))) { + if (skb_cow_head(skb, sizeof(struct mbim_tx_hdr))) { dev_kfree_skb_any(skb); return NULL; } =20 - mbim_hdr =3D skb_push(skb, __struct_size(mbim_hdr)); + mbim_hdr =3D skb_push(skb, sizeof(struct mbim_tx_hdr)); =20 /* Fill NTB header */ nth16 =3D &mbim_hdr->nth16; @@ -135,11 +134,12 @@ static struct sk_buff *mbim_tx_fixup(struct sk_buff *= skb, unsigned int session, /* Fill the unique NDP */ ndp16 =3D &mbim_hdr->ndp16; ndp16->dwSignature =3D cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN | (session= << 24)); - ndp16->wLength =3D cpu_to_le16(struct_size(ndp16, dpe16, 2)); + ndp16->wLength =3D cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + + sizeof(struct usb_cdc_ncm_dpe16) * 2); ndp16->wNextNdpIndex =3D 0; =20 /* Datagram follows the mbim header */ - ndp16->dpe16[0].wDatagramIndex =3D cpu_to_le16(__struct_size(mbim_hdr)); + ndp16->dpe16[0].wDatagramIndex =3D cpu_to_le16(sizeof(struct mbim_tx_hdr)= ); ndp16->dpe16[0].wDatagramLength =3D cpu_to_le16(dgram_size); =20 /* null termination */ @@ -585,8 +585,7 @@ static void mhi_mbim_setup(struct net_device *ndev) { ndev->header_ops =3D NULL; /* No header */ ndev->type =3D ARPHRD_RAWIP; - ndev->needed_headroom =3D - struct_size_t(struct mbim_tx_hdr, ndp16.dpe16, 2); + ndev->needed_headroom =3D sizeof(struct mbim_tx_hdr); ndev->hard_header_len =3D 0; ndev->addr_len =3D 0; ndev->flags =3D IFF_POINTOPOINT | IFF_NOARP; --=20 2.25.1