From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 EA0BF1DF252; Wed, 6 Nov 2024 12:17:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730895457; cv=none; b=cDh0c4UC6dhTkb4QZ92Ncvy1Tf6dgykTfEBTZYeqWD9yWDhtiQB6IhacsAeYIoolEiMKVAWvatZKTNVBSz+s2JPnwgoesAPiCEPQZYYXawoikGgzdyXULSuvTxmhjmddn0jul1CYroQA7nyjhQCcUu7cC55xiw7a4JxaPM3YlN0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730895457; c=relaxed/simple; bh=YUcax+c7OSxpd+bFmEOpc8bX7LAQ7dXo8BjkdccrH6k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IciWYEhCzhxR7wjAgP/oWmXtlgr5W2iD8CSN+2zGHl6Bp3gertKck2RfoI4xIsZTgiVWv8yhnkdPO6/i1XP2PHKjM1k0bc+o1c+vBQz0iFQXgVt4AGDuOsrDkdqBdJFCT9c3ZOWyXpuBxLf/JsNnmEV291jkEH06w6GLkowMZic= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RKxgs+Af; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="RKxgs+Af" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6EB62C4CECD; Wed, 6 Nov 2024 12:17:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730895456; bh=YUcax+c7OSxpd+bFmEOpc8bX7LAQ7dXo8BjkdccrH6k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RKxgs+AfyuUmN5wVqeAkVAypglM9RJZBP/0zVxp1PTlFj/dSVBZGmiAm5nZMLs9eQ XB6/vO7qJyOsRU4hBkiu6vGQIhMT2bS3KJIOKogmlfPw+upAzEClyXhz0JY/1ZlJ6j Lui2fzUXFXxQtG7ZTYJcAeo+b1V+CJWfYapR67gA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , =?UTF-8?q?Pali=20Roh=C3=A1r?= , Armin Wolf , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 4.19 225/350] ACPI: battery: Simplify battery hook locking Date: Wed, 6 Nov 2024 13:02:33 +0100 Message-ID: <20241106120326.550783162@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120320.865793091@linuxfoundation.org> References: <20241106120320.865793091@linuxfoundation.org> User-Agent: quilt/0.67 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Armin Wolf [ Upstream commit 86309cbed26139e1caae7629dcca1027d9a28e75 ] Move the conditional locking from __battery_hook_unregister() into battery_hook_unregister() and rename the low-level function to simplify the locking during battery hook removal. Reviewed-by: Ilpo Järvinen Reviewed-by: Pali Rohár Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20241001212835.341788-2-W_Armin@gmx.de Signed-off-by: Rafael J. Wysocki Stable-dep-of: 76959aff14a0 ("ACPI: battery: Fix possible crash when unregistering a battery hook") Signed-off-by: Sasha Levin --- drivers/acpi/battery.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index 88f4040d6c1f2..b741ed87ab3db 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -713,27 +713,27 @@ static LIST_HEAD(acpi_battery_list); static LIST_HEAD(battery_hook_list); static DEFINE_MUTEX(hook_mutex); -static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) +static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook) { struct acpi_battery *battery; + /* * In order to remove a hook, we first need to * de-register all the batteries that are registered. */ - if (lock) - mutex_lock(&hook_mutex); list_for_each_entry(battery, &acpi_battery_list, list) { hook->remove_battery(battery->bat); } list_del(&hook->list); - if (lock) - mutex_unlock(&hook_mutex); + pr_info("extension unregistered: %s\n", hook->name); } void battery_hook_unregister(struct acpi_battery_hook *hook) { - __battery_hook_unregister(hook, 1); + mutex_lock(&hook_mutex); + battery_hook_unregister_unlocked(hook); + mutex_unlock(&hook_mutex); } EXPORT_SYMBOL_GPL(battery_hook_unregister); @@ -759,7 +759,7 @@ void battery_hook_register(struct acpi_battery_hook *hook) * hooks. */ pr_err("extension failed to load: %s", hook->name); - __battery_hook_unregister(hook, 0); + battery_hook_unregister_unlocked(hook); goto end; } } @@ -796,7 +796,7 @@ static void battery_hook_add_battery(struct acpi_battery *battery) */ pr_err("error in extension, unloading: %s", hook_node->name); - __battery_hook_unregister(hook_node, 0); + battery_hook_unregister_unlocked(hook_node); } } mutex_unlock(&hook_mutex); @@ -829,7 +829,7 @@ static void __exit battery_hook_exit(void) * need to remove the hooks. */ list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { - __battery_hook_unregister(hook, 1); + battery_hook_unregister(hook); } mutex_destroy(&hook_mutex); } -- 2.43.0