From patchwork Sat Sep 14 10:50:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 13804354 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (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 A756138C; Sat, 14 Sep 2024 10:51:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311064; cv=none; b=oOshnNDQPzPebC2GStexCdlXHReirc6GQLULqzftCaLlKLkN2ADSnY0wBc9vl9+oT9KVuUAkAnmpkXYe/V5Z6y85ResxsuJmpsTLy0dimLZ/9Ppult8bGvdSEza8a48XGqjn5KJx050jVs92Uh8gMYD2cjVt4bXOVQAe1GEYqtY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311064; c=relaxed/simple; bh=OoicNfJK50cTdvLntxjnZVynjZjfdbu7WKyioFwc1YY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=h0EdVtLxN5VXo3qAT+DVONLbYnXDojoWk3HnvX4kIiJHeYqKgHitemLHhLWvD+FaT8rz2GxKATki3xbs5zi9y2VWSz/0Ns+1VbdCngvFqDPQ7EiEtikedlm9+1zM2t5YXa3OtgbWd6rUqHwfcY3rTH4jHGAj+zDKlbum8gd1/PU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=nQBRqUDX reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="nQBRqUDX" Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 6.2.0) id d0e4e7f6a0323e80; Sat, 14 Sep 2024 12:50:52 +0200 Received: from kreacher.localnet (unknown [195.136.19.94]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by cloudserver094114.home.pl (Postfix) with ESMTPSA id 6A2238532AE; Sat, 14 Sep 2024 12:50:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311052; bh=OoicNfJK50cTdvLntxjnZVynjZjfdbu7WKyioFwc1YY=; h=From:Subject:Date; b=nQBRqUDXby/UJVHDHPlUsiVabT3PqnYQmzWWoXXdgOXXFEY8afGF/OJq9S5ffviM4 /fjQE5xk+bHkL8woYfA+nL6gLmOxXFeIUxgHdg2E9ydvywx3EwDVW+hI2vIewJPXDT kp+AlR8gSyhnHUvZFo+t92uPxOF9IW35DnYwZn4wvs7rWrKUzoj0hM9626XUR26q6Y GDIp/ie2WGcQcc4xAggsznoTDmTj8si23V9MZ/E6+2UASjRIu1c66/Y1w4JnYo3cdj kochoi3d4QSQbPPKGPiiEXViI6rmRP5BVFGDW+dqc6EwDAfZCltiRIu/gl+Y0zhfOQ R8dkH0yDO3Z/Q== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 20/20] thermal: core: Manage thermal_governor_lock using a mutex guard Date: Sat, 14 Sep 2024 12:50:15 +0200 Message-ID: <863177860.0ifERbkFSE@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=5 Fuz1=5 Fuz2=5 From: Rafael J. Wysocki Switch over the thermal core to using a mutex guard for thermal_governor_lock management. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 40 +++++++++++++--------------------------- 1 file changed, 13 insertions(+), 27 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -123,7 +123,7 @@ int thermal_register_governor(struct the if (!governor) return -EINVAL; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); err = -EBUSY; if (!__find_governor(governor->name)) { @@ -162,8 +162,6 @@ int thermal_register_governor(struct the } } - mutex_unlock(&thermal_governor_lock); - return err; } @@ -174,10 +172,10 @@ void thermal_unregister_governor(struct if (!governor) return; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); if (!__find_governor(governor->name)) - goto exit; + return; list_del(&governor->governor_list); @@ -188,9 +186,6 @@ void thermal_unregister_governor(struct THERMAL_NAME_LENGTH)) thermal_set_governor(pos, NULL); } - -exit: - mutex_unlock(&thermal_governor_lock); } int thermal_zone_device_set_policy(struct thermal_zone_device *tz, @@ -199,16 +194,13 @@ int thermal_zone_device_set_policy(struc struct thermal_governor *gov; int ret = -EINVAL; - mutex_lock(&thermal_governor_lock); - + guard(mutex)(&thermal_governor_lock); guard(thermal_zone)(tz); gov = __find_governor(strim(policy)); if (gov) ret = thermal_set_governor(tz, gov); - mutex_unlock(&thermal_governor_lock); - thermal_notify_tz_gov_change(tz, policy); return ret; @@ -219,15 +211,13 @@ int thermal_build_list_of_policies(char struct thermal_governor *pos; ssize_t count = 0; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); list_for_each_entry(pos, &thermal_governor_list, governor_list) { count += sysfs_emit_at(buf, count, "%s ", pos->name); } count += sysfs_emit_at(buf, count, "\n"); - mutex_unlock(&thermal_governor_lock); - return count; } @@ -663,17 +653,18 @@ int for_each_thermal_governor(int (*cb)( void *data) { struct thermal_governor *gov; - int ret = 0; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); + list_for_each_entry(gov, &thermal_governor_list, governor_list) { + int ret; + ret = cb(gov, data); if (ret) - break; + return ret; } - mutex_unlock(&thermal_governor_lock); - return ret; + return 0; } int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *, @@ -1345,20 +1336,15 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_ static int thermal_zone_init_governor(struct thermal_zone_device *tz) { struct thermal_governor *governor; - int ret; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); if (tz->tzp) governor = __find_governor(tz->tzp->governor_name); else governor = def_governor; - ret = thermal_set_governor(tz, governor); - - mutex_unlock(&thermal_governor_lock); - - return ret; + return thermal_set_governor(tz, governor); } static void thermal_zone_init_complete(struct thermal_zone_device *tz)