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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 4A79DC4360F for ; Sat, 30 Mar 2019 01:34:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C19F217F5 for ; Sat, 30 Mar 2019 01:34:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553909693; bh=wxCFi0Vwx4s7u0bNIU7e/yZ+bi5iPpGjLQsdyxd/4cY=; h=From:To:Cc:Subject:Date:List-ID:From; b=uI2TlJAqaMURUM6jhPJBw3gYSCaN884AJNL6hRD0hYqvdN5fNiaHXzOr9VkTYugrI chQQSfEWecYifCjeXdFNCoCY+98gN+8k/6uD84WQaqsOeLHywMuEoDwO5lR/J8M7S2 qwUFVzCKkgQzgGUD4zhhsLKBcDMQZJJJ+Lc8FM+8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732033AbfC3Beq (ORCPT ); Fri, 29 Mar 2019 21:34:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:39936 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731362AbfC3BcD (ORCPT ); Fri, 29 Mar 2019 21:32:03 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C06F421773; Sat, 30 Mar 2019 01:32:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553909522; bh=wxCFi0Vwx4s7u0bNIU7e/yZ+bi5iPpGjLQsdyxd/4cY=; h=From:To:Cc:Subject:Date:From; b=IwHmbjleYJfB+5GY3e9ftOhWrNpdUS41e7KDr00N+yoBm/pD5o47RBv/DgcA83qLr TAV3hGJpHf43KKuf5ZpNMNFT8aRKTawGAmqzgsy3v93agOw9MBbGSuVt2BxL0w+Ist /GuxFaYL++/uBn3vnqbzw9rSckd2xX364j1eCsWA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Siva Rebbagondla , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 01/16] rsi: improve kernel thread handling to fix kernel panic Date: Fri, 29 Mar 2019 21:31:45 -0400 Message-Id: <20190330013200.1130-1-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Siva Rebbagondla [ Upstream commit 4c62764d0fc21a34ffc44eec1210038c3a2e4473 ] While running regressions, observed below kernel panic when sdio disconnect called. This is because of, kthread_stop() is taking care of wait_for_completion() by default. When wait_for_completion triggered in kthread_stop and as it was done already, giving kernel panic. Hence, removing redundant wait_for_completion() from rsi_kill_thread(). ... skipping ... BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] exit_creds+0x1f/0x50 PGD 0 Oops: 0002 [#1] SMP CPU: 0 PID: 6502 Comm: rmmod Tainted: G OE 4.15.9-Generic #154-Ubuntu Hardware name: Dell Inc. Edge Gateway 3003/ , BIOS 01.00.00 04/17/2017 Stack: ffff88007392e600 ffff880075847dc0 ffffffff8108160a 0000000000000000 ffff88007392e600 ffff880075847de8 ffffffff810a484b ffff880076127000 ffff88003cd3a800 ffff880074f12a00 ffff880075847e28 ffffffffc09bed15 Call Trace: [] __put_task_struct+0x5a/0x140 [] kthread_stop+0x10b/0x110 [] rsi_disconnect+0x2f5/0x300 [ven_rsi_sdio] [] ? __pm_runtime_resume+0x5b/0x80 [] sdio_bus_remove+0x38/0x100 [] __device_release_driver+0xa4/0x150 [] driver_detach+0xb5/0xc0 [] bus_remove_driver+0x55/0xd0 [] driver_unregister+0x2c/0x50 [] sdio_unregister_driver+0x1a/0x20 [] rsi_module_exit+0x15/0x30 [ven_rsi_sdio] [] SyS_delete_module+0x1b8/0x210 [] entry_SYSCALL_64_fastpath+0x1c/0xbb Signed-off-by: Siva Rebbagondla Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/rsi/rsi_common.h | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/net/wireless/rsi/rsi_common.h b/drivers/net/wireless/rsi/rsi_common.h index d3fbe33d2324..a13f08fd8690 100644 --- a/drivers/net/wireless/rsi/rsi_common.h +++ b/drivers/net/wireless/rsi/rsi_common.h @@ -75,7 +75,6 @@ static inline int rsi_kill_thread(struct rsi_thread *handle) atomic_inc(&handle->thread_done); rsi_set_event(&handle->event); - wait_for_completion(&handle->completion); return kthread_stop(handle->task); } -- 2.19.1