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 7C363C77B73 for ; Mon, 8 May 2023 10:14:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234264AbjEHKOw (ORCPT ); Mon, 8 May 2023 06:14:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234267AbjEHKOk (ORCPT ); Mon, 8 May 2023 06:14:40 -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 F102E3A2A4 for ; Mon, 8 May 2023 03:14:39 -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 86ADB62441 for ; Mon, 8 May 2023 10:14:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77F94C433EF; Mon, 8 May 2023 10:14:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683540879; bh=fR447qCUHqd1XIcwE65uEDSnE7I+CdeCFZ5MJpYYjOI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rw+g0jWiqF8zccAShqDmkZqDsRtDVyxuVrznU8/CP2eYq3ulVZRCSTLe5eEcjuCku Cj8gBN28rWrkrc+xpr5gV8n4dZHab0zhBmQkeAIiLq/+pWlGG97ZQeHRuojRK3wvrD xT0Crrm4RCpSxiuhHbYrIfqjxQOam5kHSWsGKAtA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "H. Nikolaus Schaller" , Pavel Machek , =?UTF-8?q?Marek=20Beh=C3=BAn?= , Lee Jones , Sasha Levin Subject: [PATCH 6.1 533/611] leds: tca6507: Fix error handling of using fwnode_property_read_string Date: Mon, 8 May 2023 11:46:15 +0200 Message-Id: <20230508094439.327955706@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094421.513073170@linuxfoundation.org> References: <20230508094421.513073170@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: stable@vger.kernel.org From: H. Nikolaus Schaller [ Upstream commit c1087c29e96a48e9080377e168d35dcb52fb068b ] Commit 96f524105b9c ("leds: tca6507: use fwnode API instead of OF") changed to fwnode API but did not take into account that a missing property "linux,default-trigger" now seems to return an error and as a side effect sets value to -1. This seems to be different from of_get_property() which always returned NULL in any case of error. Neglecting this side-effect leads to [ 11.201965] Unable to handle kernel paging request at virtual address ffffffff when read in the strcmp() of led_trigger_set_default() if there is no led-trigger defined in the DTS. I don't know if this was recently introduced somewhere in the fwnode lib or if the effect was missed in initial testing. Anyways it seems to be a bug to ignore the error return value of an optional value here in the driver. Fixes: 96f524105b9c ("leds: tca6507: use fwnode API instead of OF") Signed-off-by: H. Nikolaus Schaller Acked-by: Pavel Machek Reviewed-by: Marek Behún Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/cbae7617db83113de726fcc423a805ebaa1bfca6.1680433978.git.hns@goldelico.com Signed-off-by: Sasha Levin --- drivers/leds/leds-tca6507.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/leds/leds-tca6507.c b/drivers/leds/leds-tca6507.c index 161bef65c6b7b..62a968613cc37 100644 --- a/drivers/leds/leds-tca6507.c +++ b/drivers/leds/leds-tca6507.c @@ -691,8 +691,9 @@ tca6507_led_dt_init(struct device *dev) if (fwnode_property_read_string(child, "label", &led.name)) led.name = fwnode_get_name(child); - fwnode_property_read_string(child, "linux,default-trigger", - &led.default_trigger); + if (fwnode_property_read_string(child, "linux,default-trigger", + &led.default_trigger)) + led.default_trigger = NULL; led.flags = 0; if (fwnode_property_match_string(child, "compatible", -- 2.39.2