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,URIBL_BLOCKED,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 F2E08C433DB for ; Tue, 2 Feb 2021 15:21:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1AE564E40 for ; Tue, 2 Feb 2021 15:21:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235486AbhBBPU4 (ORCPT ); Tue, 2 Feb 2021 10:20:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:39394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235359AbhBBPQz (ORCPT ); Tue, 2 Feb 2021 10:16:55 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id D49DE64FAF; Tue, 2 Feb 2021 15:07:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1612278474; bh=vwY4oJVsAOPWacoX4pBi7QpzcbEii844hqLpg8lt2B0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A/Z4vTsE12uOH5V2rS4tuSjzT20++Izh39aDkSrBtYdmDomrS8wzg1pzjHo7DH3PI VlENevyxj9FNQnvJVz5+FOZY2yZRlygHhW9F66tW2M2plmb34n+zDy/z26C3ZWuVeQ EGEBd4BiNsQ44qva56B1wGf5tLcPT/jmYKX8ihBm1nTsAuuVP0gP7qr3BFDpUYyxCv Ga+LWb594TrwsFGgifvXD3c+H2DR1qH7Ke4JbUXduii1M5qf2fzQtjUWmo87i5l/4o rxnSUbr1UpeIYVpYjUeNYnYoXZhVVcgcgn0flJimUVXjIDBuG+aaYU9ry8Xx9L8N5X aH6FX39k86Fsw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Johannes Berg , Luca Coelho , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 3/5] iwlwifi: mvm: guard against device removal in reprobe Date: Tue, 2 Feb 2021 10:07:48 -0500 Message-Id: <20210202150750.1864953-3-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210202150750.1864953-1-sashal@kernel.org> References: <20210202150750.1864953-1-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: netdev@vger.kernel.org From: Johannes Berg [ Upstream commit 7a21b1d4a728a483f07c638ccd8610d4b4f12684 ] If we get into a problem severe enough to attempt a reprobe, we schedule a worker to do that. However, if the problem gets more severe and the device is actually destroyed before this worker has a chance to run, we use a free device. Bump up the reference count of the device until the worker runs to avoid this situation. Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/iwlwifi.20210122144849.871f0892e4b2.I94819e11afd68d875f3e242b98bef724b8236f1e@changeid Signed-off-by: Sasha Levin --- drivers/net/wireless/iwlwifi/mvm/ops.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/ops.c b/drivers/net/wireless/iwlwifi/mvm/ops.c index 13c97f665ba88..bb81261de45fa 100644 --- a/drivers/net/wireless/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/iwlwifi/mvm/ops.c @@ -909,6 +909,7 @@ static void iwl_mvm_reprobe_wk(struct work_struct *wk) reprobe = container_of(wk, struct iwl_mvm_reprobe, work); if (device_reprobe(reprobe->dev)) dev_err(reprobe->dev, "reprobe failed!\n"); + put_device(reprobe->dev); kfree(reprobe); module_put(THIS_MODULE); } @@ -991,7 +992,7 @@ void iwl_mvm_nic_restart(struct iwl_mvm *mvm, bool fw_error) module_put(THIS_MODULE); return; } - reprobe->dev = mvm->trans->dev; + reprobe->dev = get_device(mvm->trans->dev); INIT_WORK(&reprobe->work, iwl_mvm_reprobe_wk); schedule_work(&reprobe->work); } else if (mvm->cur_ucode == IWL_UCODE_REGULAR) { -- 2.27.0