From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7324C51B16C; Wed, 30 Sep 2026 18:23:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792631; cv=none; b=Jhp0NPKVU8mu5KV+M7WEdw++j283HXPnioPOyb8yvYir5ph0fs2GfklAfUz1OtqzvJiaOg1t0qfD+cG0CE3h2bfzISzasZbmUCMIjUIWnp1+3ZWAA5/9PQbE8P4lyH+T6i0cyWkQXsQbs0MxHM8SmlKC2kmMMeJsXpBXrpbF2Xw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792631; c=relaxed/simple; bh=1JjEFuSLaEtRF3eOBojRX9B60o+J4gOgwdCyaRK4Av8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EvTVQij5GAgYLdZ6+Gn+NLklur87WdDHpMXKau05PO+BGYKzJqzVU2wc4mz2rOgArJYZ+/N866EfyVheZxuRDy95GgOq33bPjy0fq6hfU5RxHccmxpDWRyKUD3sK5nBUfSUNGsMAHV81p8XhFJ4OljbllwtIKAcME/w4maJT7eI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1gkfrq16; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="1gkfrq16" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A229F1F000FF; Wed, 30 Sep 2026 18:23:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790792630; bh=ZbIrUl0h4BQ8l4fU688G2es1i/jGeeY7535Nz4zvI4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=1gkfrq16o6skR1vFNJDudcz4cpOOujVLoFQR3SpPzZNYcvGLlfQuyoFfb2jZDPcBm ValfT2z9fCkS8ClmxtU0KRmWxGJudLGuaIdMUpGsCb3vqim54XEn/tkEhyz11ediuQ jUC8lcBCcNVGpTu4HwE9nL2Q4VA8jZaMXRo7XsZk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Gajdos=20Tam=C3=A1s?= , Paolo Abeni Subject: [PATCH 5.15 723/752] net: atl1e: fix soft lockup on out-of-range hw_next_to_clean read Date: Wed, 30 Sep 2026 17:29:53 +0200 Message-ID: <20260930152413.865780116@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Gajdos Tamás commit 374bf9e4b90f979e052332c4faca2d745c491a12 upstream. Same issue as atl1c (see the first commit in this series, "net: atl1c: fix soft lockup on out-of-range tpd_cons read"): the hardware can report an out-of-range hw_next_to_clean (seen as 0xffff) while the PCIe link/MAC is resetting. An out-of-range value can never be reached and the loop below would spin forever. Treat it as "nothing new to clean" instead. Fixes: a6a5325239c202 ("atl1e: Atheros L1E Gigabit Ethernet driver") Cc: stable@vger.kernel.org Signed-off-by: Gajdos Tamás Link: https://patch.msgid.link/20260921091334.3571525-3-tamas@rimpianto.com Signed-off-by: Paolo Abeni Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/atheros/atl1e/atl1e_main.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c +++ b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c @@ -1234,6 +1234,9 @@ static bool atl1e_clean_tx_irq(struct at u16 hw_next_to_clean = AT_READ_REGW(&adapter->hw, REG_TPD_CONS_IDX); u16 next_to_clean = atomic_read(&tx_ring->next_to_clean); + if (unlikely(hw_next_to_clean >= tx_ring->count)) + hw_next_to_clean = next_to_clean; + while (next_to_clean != hw_next_to_clean) { tx_buffer = &tx_ring->tx_buffer[next_to_clean]; if (tx_buffer->dma) {