From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 F034A1BF7F9; Wed, 20 Nov 2024 13:01:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732107710; cv=none; b=pUgJR3OV2msOQMf2IP4WhctzAxUq4oWHS5ZAIGTAVE8HEKAAc9Q2VubW75o7WeJCiOHggG0NU5JskpS4hF4zMgGz4ojvmS8J/5w+1y+69guMDlaZu7IKZVMIDanNSsgz5dZg8ooSt9IFOch1DJvhOS/UIUG9a7NFi/qcN3Fr1fU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732107710; c=relaxed/simple; bh=GwfFr5xbFpIl2xt/z6tftNiOWtaGjwxP2Y2qGgBd1w8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jRHGSWstOn7vfjSLT1YYMxTNQgH5pDm5dkdVzZeE7v+s6eWek1XFcY1zs5XuVQy00zg0/xdKbViuJNq9IEAdrV6n/sjz7Grv5atVl+fMj1hLaPnrBChqKkcmxui1Z1SuQ/LaWjRMfP7s58jS5JhonmELyqGRYGwnounQTRlgni4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=At7iecgM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="At7iecgM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD480C4CED1; Wed, 20 Nov 2024 13:01:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1732107709; bh=GwfFr5xbFpIl2xt/z6tftNiOWtaGjwxP2Y2qGgBd1w8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=At7iecgMMHMcxfZ/FmU0UpoYpIFY8HeTmkEiS9wJu/qA0nhK2pnasTnddP6PEXlBo IRNHUYsCdgGczGPe5AQLbD67hYds26+9CKtbpsNDh1fOBV3L6cpF/lNQlZYsaC0Msq m7UEJRbQ7qLKNDNG4oGS1nBct1NiBmhGJqRqkJCw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wei Fang , Jakub Kicinski , Sasha Levin , Xiangyu Chen Subject: [PATCH 6.1 60/73] net: fec: remove .ndo_poll_controller to avoid deadlocks Date: Wed, 20 Nov 2024 13:58:46 +0100 Message-ID: <20241120125811.049647321@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241120125809.623237564@linuxfoundation.org> References: <20241120125809.623237564@linuxfoundation.org> User-Agent: quilt/0.67 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-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wei Fang [ Upstream commit c2e0c58b25a0a0c37ec643255558c5af4450c9f5 ] There is a deadlock issue found in sungem driver, please refer to the commit ac0a230f719b ("eth: sungem: remove .ndo_poll_controller to avoid deadlocks"). The root cause of the issue is that netpoll is in atomic context and disable_irq() is called by .ndo_poll_controller interface of sungem driver, however, disable_irq() might sleep. After analyzing the implementation of fec_poll_controller(), the fec driver should have the same issue. Due to the fec driver uses NAPI for TX completions, the .ndo_poll_controller is unnecessary to be implemented in the fec driver, so fec_poll_controller() can be safely removed. Fixes: 7f5c6addcdc0 ("net/fec: add poll controller function for fec nic") Signed-off-by: Wei Fang Link: https://lore.kernel.org/r/20240511062009.652918-1-wei.fang@nxp.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin Signed-off-by: Xiangyu Chen Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/freescale/fec_main.c | 26 -------------------------- 1 file changed, 26 deletions(-) --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -3508,29 +3508,6 @@ fec_set_mac_address(struct net_device *n return 0; } -#ifdef CONFIG_NET_POLL_CONTROLLER -/** - * fec_poll_controller - FEC Poll controller function - * @dev: The FEC network adapter - * - * Polled functionality used by netconsole and others in non interrupt mode - * - */ -static void fec_poll_controller(struct net_device *dev) -{ - int i; - struct fec_enet_private *fep = netdev_priv(dev); - - for (i = 0; i < FEC_IRQ_NUM; i++) { - if (fep->irq[i] > 0) { - disable_irq(fep->irq[i]); - fec_enet_interrupt(fep->irq[i], dev); - enable_irq(fep->irq[i]); - } - } -} -#endif - static inline void fec_enet_set_netdev_features(struct net_device *netdev, netdev_features_t features) { @@ -3604,9 +3581,6 @@ static const struct net_device_ops fec_n .ndo_tx_timeout = fec_timeout, .ndo_set_mac_address = fec_set_mac_address, .ndo_eth_ioctl = fec_enet_ioctl, -#ifdef CONFIG_NET_POLL_CONTROLLER - .ndo_poll_controller = fec_poll_controller, -#endif .ndo_set_features = fec_set_features, };