From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7F40747A877; Fri, 7 Aug 2026 15:44:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786117490; cv=none; b=UGAsC709oMPDm61EP0k1byZtLphzvOx73xRrGaHyICb28SGP5hzaMlWpp5xOCymyVT3jcZcaFknG7BggS7d1mYQBEJg1LY9Koek2BhKSou94WWyeYMcZOoEgsNlMaw47s7w7OmQExUj3EnfXPqmM73cJt8PJUeunbgAtJfeOHQA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786117490; c=relaxed/simple; bh=DVIollRPDNLqO6PaqBiYdhALzrSRY2UAc65F7JDlBgg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uz1jiWJxq6Ma4TE3Cz/2Ife5i5HJLU/sFcJGXc5iyc5k1vUSjGbdFgZonr3Wpv6Q8dslbTaJw7N2PC4/bZLLPOydEDuAHcZLnCNY2Cua0Vjhlqy1VhGpwEVNkbtSVxv+ca1JaIEIAykAnNrvAT8kJCdz2GOEdAW80aOOLXrfnDs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=L5Ww3pX6; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="L5Ww3pX6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC66C1F000E9; Fri, 7 Aug 2026 15:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786117489; bh=Q9p9lfWTjRIeWkj0PFFAd4EYw65QkSRorfmmaDrS8Y0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=L5Ww3pX6JZvrESyfTxIA4nmeLAiQTYIHU9l0rpGZtj7d7ZGCESBEZ4q7wSdfRdF5d hnDIGWQhJd/tUWfxEX2KeeIoGEXyPUOA5U/lwR33cFZkDL21m4TMYC1+4NIimbayeX hD9gw64kiLvfClkDlxye4LaLgEsVmlxULPrDf1cU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jianing Li , Sebastian Reichel Subject: [PATCH 7.1 336/438] power: supply: max17040: handle missing status supplier Date: Fri, 7 Aug 2026 16:38:52 +0200 Message-ID: <20260807143435.136685669@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260807143428.008222056@linuxfoundation.org> References: <20260807143428.008222056@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jianing Li commit 725668c6b6aa3971fe850659102c250d0d676e18 upstream. MAX17040 does not report charger state itself, so the driver forwards POWER_SUPPLY_PROP_STATUS to a supplier power supply. If no supplier is registered, power_supply_get_property_from_supplier() returns -ENODEV and leaves the output value untouched. max17040_get_property() currently ignores that error and returns success, so userspace can read an uninitialized status value from the battery power supply. This happens on systems that use the fuel gauge without a charger supplier relationship in firmware. Return POWER_SUPPLY_STATUS_UNKNOWN when no supplier provides STATUS, and propagate other supplier lookup errors. Fixes: f4b782af61ae ("power: max17040: pass status property from supplier") Cc: stable@vger.kernel.org # 6.7+ Signed-off-by: Jianing Li Link: https://patch.msgid.link/20260701061042.1008-1-m13940358460@163.com Signed-off-by: Sebastian Reichel Signed-off-by: Greg Kroah-Hartman --- drivers/power/supply/max17040_battery.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/power/supply/max17040_battery.c +++ b/drivers/power/supply/max17040_battery.c @@ -405,7 +405,11 @@ static int max17040_get_property(struct val->intval = chip->low_soc_alert; break; case POWER_SUPPLY_PROP_STATUS: - power_supply_get_property_from_supplier(psy, psp, val); + ret = power_supply_get_property_from_supplier(psy, psp, val); + if (ret == -ENODEV) + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + else if (ret) + return ret; break; case POWER_SUPPLY_PROP_TEMP: if (!chip->channel_temp)