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 D65461C57B1; Tue, 15 Oct 2024 12:06:40 +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=1728994001; cv=none; b=joVUrlCQrg6LGeprruNTHQTU8BOVDNuKQrle24qXQSLb6Rkw1dzBbOd+ZHdJQk4sVGdE1TTNrqmLm1AQ+Dthx0Jhto6lZfd1oPAlQh7k7Lh1rJ7dAS2NAtv2rdLl46ja28S7UkuYv63B0oA17wLLVb3mXV6zpezNUMPnXK6JONE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728994001; c=relaxed/simple; bh=j/C6tqke5US5ImDyKAQgqlhftegz9sTvpAQ4fSQE9ag=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HN4ocCD4jXZnJD9XbRRn4otlrpBjnN7s32qIzEWOVDeH3Ua1ynx7Opkv5US4nEFUMGWvUWskuMH1QNibgfQFqd5XqevXt384lyIc1i6PYo59SYCdLCclWDjKzJ+DSm6hs2wIaBHNZx7SoXANQr6enJclybyFkZxcAQkmn1FQsUI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dNcOuswt; 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="dNcOuswt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8287C4CEC6; Tue, 15 Oct 2024 12:06:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728994000; bh=j/C6tqke5US5ImDyKAQgqlhftegz9sTvpAQ4fSQE9ag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dNcOuswtrVlhqksXEtYZSb31w5QbOOnsTv4iAE0Dg5M+Jop6A7aEfM3Mpe9Y2nJpT eRvm4OnQVPtuvA7WtpcAP4jI2CXt7X8D3zjDJIWIJepLPmsl4518u6YUV9k/M3a/Gk zA7kQn967RhFbOM4h0OiUV2dU5qWqhed83hp6mLM= 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 5.15 577/691] ACPI: battery: Simplify battery hook locking Date: Tue, 15 Oct 2024 13:28:45 +0200 Message-ID: <20241015112503.241652289@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241015112440.309539031@linuxfoundation.org> References: <20241015112440.309539031@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 5.15-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 aed4132985a96..6a8580427e1a9 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -701,27 +701,27 @@ 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); @@ -747,7 +747,7 @@ 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; } } @@ -784,7 +784,7 @@ 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); @@ -817,7 +817,7 @@ 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