From patchwork Mon May 16 19:36:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 573764 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 3D2EEC433FE for ; Mon, 16 May 2022 20:05:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346844AbiEPUFM (ORCPT ); Mon, 16 May 2022 16:05:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348851AbiEPT7A (ORCPT ); Mon, 16 May 2022 15:59:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 761F813C; Mon, 16 May 2022 12:51:30 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 159D760AB8; Mon, 16 May 2022 19:51:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 215F7C34100; Mon, 16 May 2022 19:51:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730689; bh=ccProHhun/zlF6hS7JP7T+bHG1ax79j7/ZabQXNbMgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZwTQst87WWxUkrpl/F8ys50f+/gl7a+9WHN+e5J6Arq5qxxQEF+dTuvt7EGZt7K/P Q+bisXKE4zw7Hc6LOMHI5S575LfIhxGj4AyhEbPICicQ3G61QPcchxdtEmAUVe3PDm Wrjo7RcZOMImm7H5wWVLzbBXhg6POR/nAW3k9eHQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Indan Zupancic Subject: [PATCH 5.15 078/102] fsl_lpuart: Dont enable interrupts too early Date: Mon, 16 May 2022 21:36:52 +0200 Message-Id: <20220516193626.233730510@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193623.989270214@linuxfoundation.org> References: <20220516193623.989270214@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Indan Zupancic commit 401fb66a355eb0f22096cf26864324f8e63c7d78 upstream. If an irq is pending when devm_request_irq() is called, the irq handler will cause a NULL pointer access because initialisation is not done yet. Fixes: 9d7ee0e28da59 ("tty: serial: lpuart: avoid report NULL interrupt") Cc: stable Signed-off-by: Indan Zupancic Link: https://lore.kernel.org/r/20220505114750.45423-1-Indan.Zupancic@mep-info.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/fsl_lpuart.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -2650,6 +2650,7 @@ static int lpuart_probe(struct platform_ struct device_node *np = pdev->dev.of_node; struct lpuart_port *sport; struct resource *res; + irq_handler_t handler; int ret; sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); @@ -2727,17 +2728,11 @@ static int lpuart_probe(struct platform_ if (lpuart_is_32(sport)) { lpuart_reg.cons = LPUART32_CONSOLE; - ret = devm_request_irq(&pdev->dev, sport->port.irq, lpuart32_int, 0, - DRIVER_NAME, sport); + handler = lpuart32_int; } else { lpuart_reg.cons = LPUART_CONSOLE; - ret = devm_request_irq(&pdev->dev, sport->port.irq, lpuart_int, 0, - DRIVER_NAME, sport); + handler = lpuart_int; } - - if (ret) - goto failed_irq_request; - ret = uart_add_one_port(&lpuart_reg, &sport->port); if (ret) goto failed_attach_port; @@ -2759,13 +2754,18 @@ static int lpuart_probe(struct platform_ sport->port.rs485_config(&sport->port, &sport->port.rs485); + ret = devm_request_irq(&pdev->dev, sport->port.irq, handler, 0, + DRIVER_NAME, sport); + if (ret) + goto failed_irq_request; + return 0; +failed_irq_request: failed_get_rs485: failed_reset: uart_remove_one_port(&lpuart_reg, &sport->port); failed_attach_port: -failed_irq_request: lpuart_disable_clks(sport); failed_clock_enable: failed_out_of_range: