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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EAD7C32771 for ; Mon, 26 Sep 2022 11:38:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238113AbiIZLiA (ORCPT ); Mon, 26 Sep 2022 07:38:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238082AbiIZLhL (ORCPT ); Mon, 26 Sep 2022 07:37:11 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 998A81C11B; Mon, 26 Sep 2022 03:44:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C07E6B80972; Mon, 26 Sep 2022 10:43:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DFF8C433D6; Mon, 26 Sep 2022 10:43:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664189038; bh=d2gwwyn7sUx/cFG3rWOZQeZ+/sihKRv0+wPHQx4XLZ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yXsjB/t8i7opbs2kAYSCMQmokifqYCptC4QpVohWH4zFmZg0g2aatGYi2Zfk0zPVm r4RbJ4BmFI3ecT+xRzu/YfBkWQU1FZEw9oPUTd+/LlFiZFmbR7jdlfzq3SMxSP42aj JY5qWpOXpee9AKIRHoL4ddCFq5LThdwKZjCSpAUo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Meng Li , Kent Gibson , Bartosz Golaszewski Subject: [PATCH 5.19 053/207] gpiolib: cdev: Set lineevent_state::irq after IRQ register successfully Date: Mon, 26 Sep 2022 12:10:42 +0200 Message-Id: <20220926100808.996403154@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220926100806.522017616@linuxfoundation.org> References: <20220926100806.522017616@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Meng Li commit 69bef19d6b9700e96285f4b4e28691cda3dcd0d1 upstream. When running gpio test on nxp-ls1028 platform with below command gpiomon --num-events=3 --rising-edge gpiochip1 25 There will be a warning trace as below: Call trace: free_irq+0x204/0x360 lineevent_free+0x64/0x70 gpio_ioctl+0x598/0x6a0 __arm64_sys_ioctl+0xb4/0x100 invoke_syscall+0x5c/0x130 ...... el0t_64_sync+0x1a0/0x1a4 The reason of this issue is that calling request_threaded_irq() function failed, and then lineevent_free() is invoked to release the resource. Since the lineevent_state::irq was already set, so the subsequent invocation of free_irq() would trigger the above warning call trace. To fix this issue, set the lineevent_state::irq after the IRQ register successfully. Fixes: 468242724143 ("gpiolib: cdev: refactor lineevent cleanup into lineevent_free") Cc: stable@vger.kernel.org Signed-off-by: Meng Li Reviewed-by: Kent Gibson Signed-off-by: Bartosz Golaszewski Signed-off-by: Greg Kroah-Hartman --- drivers/gpio/gpiolib-cdev.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -1975,7 +1975,6 @@ static int lineevent_create(struct gpio_ ret = -ENODEV; goto out_free_le; } - le->irq = irq; if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? @@ -1989,7 +1988,7 @@ static int lineevent_create(struct gpio_ init_waitqueue_head(&le->wait); /* Request a thread to read the events */ - ret = request_threaded_irq(le->irq, + ret = request_threaded_irq(irq, lineevent_irq_handler, lineevent_irq_thread, irqflags, @@ -1998,6 +1997,8 @@ static int lineevent_create(struct gpio_ if (ret) goto out_free_le; + le->irq = irq; + fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); if (fd < 0) { ret = fd;