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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64475C47096 for ; Thu, 3 Jun 2021 17:15:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4EAB1613FF for ; Thu, 3 Jun 2021 17:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233393AbhFCRQo (ORCPT ); Thu, 3 Jun 2021 13:16:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:43278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232655AbhFCRMr (ORCPT ); Thu, 3 Jun 2021 13:12:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 29A9561401; Thu, 3 Jun 2021 17:10:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622740220; bh=e5fmkblM8CdcxRtrWVQQI5defxu8oUddysWoUM9Z8i0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k0BiZTEN+ZSxfFZj+3p2DGgkpR2iBwL9+i2lf8OYLCgA4OYvPD9ZyIRnRTRcpyeq0 dvluU5uqlANc7TyRQkZOLE+icil+Px8mP0OloB0Nhx8vfCt+/3860aSA6vw/Y5YyCR wh8B4YcezSSZH2zidmTPEIhYSIijZLMnZd89xezbMHiM2KGIZxcnaRYnid901bgeh6 05MBnozBnZNlN5CKhoDbp6ou3LDo6Xl+FajBuv5SbQni0UMCPuKasDPbw9jeqLjye0 TYYdXe/ZaP4O0AR2gEo7JvR6tAi/r875EfvcI6FWwPbrbjFDfoWwebHIhxZ0vBrlb5 ZKWujLq6VwaFw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zong Li , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 17/23] net: macb: ensure the device is available before accessing GEMGXL control registers Date: Thu, 3 Jun 2021 13:09:53 -0400 Message-Id: <20210603170959.3169420-17-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210603170959.3169420-1-sashal@kernel.org> References: <20210603170959.3169420-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zong Li [ Upstream commit 5eff1461a6dec84f04fafa9128548bad51d96147 ] If runtime power menagement is enabled, the gigabit ethernet PLL would be disabled after macb_probe(). During this period of time, the system would hang up if we try to access GEMGXL control registers. We can't put runtime_pm_get/runtime_pm_put/ there due to the issue of sleep inside atomic section (7fa2955ff70ce453 ("sh_eth: Fix sleeping function called from invalid context"). Add netif_running checking to ensure the device is available before accessing GEMGXL device. Changed in v2: - Use netif_running instead of its own flag Signed-off-by: Zong Li Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/cadence/macb_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 0374a1ba1010..d110aa616a95 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -2513,6 +2513,9 @@ static struct net_device_stats *gem_get_stats(struct macb *bp) struct gem_stats *hwstat = &bp->hw_stats.gem; struct net_device_stats *nstat = &bp->dev->stats; + if (!netif_running(bp->dev)) + return nstat; + gem_update_stats(bp); nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors + -- 2.30.2