From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D0763D9541 for ; Thu, 6 Aug 2026 06:19:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785997176; cv=none; b=iUfXAjvW5YbCOrx15MXyUTzFUINrshkg1cJrAC9bR1iAUaGheN2XQtnO2qZ/3kPKmWUDRFHMEgfK+UMNZNBc0NexaPhYpAqrw1XpE9+z1RBQviMOlJInXYvr/1EDSqpt5Cgb4Fky/oaDnXSbau3PGsTISclqajlWhJWUCH0m0dE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785997176; c=relaxed/simple; bh=4ZQW8bAzXf3z6xTN3u8cqfzyMaqOtkEgC7NekBmJE+M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hD+1Lw7Uy8KuZj2boy0yjN0hFnzHPJUSpkeep0510MlJisS6kG7DLkwlA82ux6inS0TFhBDZywbR5t/hBKx2txAUWkwZH+b+A1ItuWEvrYbQwkCwK39yEzyciKbCSeCTZ6wUdKcL7fJWoZQAAg/M4RNCFJmr7u8lWhM19dEGkRo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ZcadzZSF; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZcadzZSF" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-2cacf197759so27662445ad.2 for ; Wed, 05 Aug 2026 23:19:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785997174; x=1786601974; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=a8OsaR2KbXJDR++z1B7bBvi3orWX3t7kh3YROuTJgmM=; b=ZcadzZSF13qNoO7MXeCcrlQqeGOUyea16+aVLU18H4ed7fURBAFSdBO6bV+Ely9Ttb +Toz0UTvD0VrK6HjAHtpJCQkAJgO5faZAkCc2PG2X/h4tnn7SDP4FUKcj80iWs1VAkWt l09oaKeBwA2xK4pXqziygpkBs3lLH2JFKWqZdnaZLmbo6sUzgbXkv9YjoVEFlZf7OSTq 6je2w32ZQRyhzLwy1YfyjijVii8DaMlhMZSwqLAj5iBtSCGLR+iY6uBNxCHpHBucxanH ENzeLCnNHQFRMMhob1N8QbjEf1PAU5zRBXVlbyqXPGv5/dnOgO2Uw22OpCSw2ilNvyZS sGnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785997174; x=1786601974; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=a8OsaR2KbXJDR++z1B7bBvi3orWX3t7kh3YROuTJgmM=; b=VvSRP9k15adCv6L8x3PBxMQ0+9mtKsUp8Ph3SNRddKswm3Uu5sH2gmMk0A7zPpTiBN rjkk4zhFuDQDSZIGmMTdf+peul2T+pXtp3nzho3W7aYkZ5nUCTRGnMKoOaVstNoQ6br4 c5Lq9HA4yjFFZhtwPhVTThYOP+/+kEoTsd3wquzjBAAfz9e9xxZxAZTnqlyYSRz/9os2 hhaFQg8jGqJnPskAyr6FaO9yz53WFMo+hgI9ux08zh9tD4jnYvp7XWw9Qc7vOftmdU1X EvNbpzYZs/GZ6whFwcPjnBVKVTSuLbgv3AlSQwTadni0D1u2vCOGUjajXTHnjtpXreta Mw8w== X-Forwarded-Encrypted: i=1; AHgh+RotUhL3+iX4DT2CTdaYppEDuTSEY09kisjwYHeOF3A+9sTul1LbWWHN+oTnf49CkxO0j8vkLQIqr6mvNp8=@vger.kernel.org X-Gm-Message-State: AOJu0Yyq/tRl3iohPJIqX4VeYO42Ufzd/vSST7oc8SPtmfp2ziSGs8iS U8huepNSo+K3ynp+Kc258b1EaTbLVTDBR5JhRsmnb+o5GUgC7qBgQPi8 X-Gm-Gg: AR+sD11BJSO8o1u88bp5Hhnfv4FWT9Uw0p1bKYH7NPrh14A6wxZcXKbDeTvbyG9S9E5 0mmhO8hGuKY4VdExvDzMBvh9WAi7oIIZJ7NDC0ufLjPhD11/8uw67hof/QkfV0RvFlZCXMhjWNO lMlp0u/oit/dGLmB7K/7hjSuAf5U7gL6f6Twf901nbKIonDkCBYSOp6r3vypJBxhkJDDNhKjb+8 isXTLx/mSZVEfmVWNwu52PP0OviCCZp/vi8v4WGN52LKIGJ8JGLVvBHFhsGqXJtBavVeE2lgU52 478Rfx2NhYUM1azHdRs6ONl5+glM79vNInNwtuC5rnHJMfYT2D02tNi8RSLZVNaGhFxQspDmd6D cHhcdGE+Y2CWMfosZB40+VWN0m7rhCY1IvyVF0wN3VVm7frwe9WR3AtEJ7m4lUWRNaxg4udNf1P k9u4SGN/Vpr3u1V4KTaS6Tb/mrH6lYfmIkBEAqZHEXs7vQL9Zsrb178mjKwjt90pcuf/uE0ilRI rV+fsvutRa33qWqZzfdheoqzLvRaKNeG+zQahbfFBiIrv3vmJ4= X-Received: by 2002:a05:6a20:e212:b0:3b4:7e2d:a3bc with SMTP id adf61e73a8af0-3cb85bcef1emr12802930637.0.1785997173912; Wed, 05 Aug 2026 23:19:33 -0700 (PDT) Received: from dtor-ws.sjc.corp.google.com ([2a00:79e0:2ebe:8:d081:36b2:965:e66f]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13fca50acddsm21651689c88.3.2026.08.05.23.19.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2026 23:19:32 -0700 (PDT) From: Dmitry Torokhov To: Mark Pearson , "Derek J. Clark" Cc: Henrique de Moraes Holschuh , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Nitin Joshi , platform-driver-x86@vger.kernel.org, ibm-acpi-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] platform/x86: thinkpad_acpi: use __free(kfree) for automatic cleanup Date: Wed, 5 Aug 2026 23:19:24 -0700 Message-ID: <20260806061925.625482-3-dmitry.torokhov@gmail.com> X-Mailer: git-send-email 2.55.0.679.g6767b8d81c-goog In-Reply-To: <20260806061925.625482-1-dmitry.torokhov@gmail.com> References: <20260806061925.625482-1-dmitry.torokhov@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use __free(kfree) for local pointer allocations in dispatch_proc_write(), tpacpi_brightness_get_ecnvram(), and auxmac_init(). This ensures automatic memory cleanup when exiting function scope and removes explicit kfree() calls on exit paths. Assisted-by: Antigravity:gemini-3.6-flash Signed-off-by: Dmitry Torokhov --- drivers/platform/x86/lenovo/thinkpad_acpi.c | 40 +++++++-------------- 1 file changed, 13 insertions(+), 27 deletions(-) diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform/x86/lenovo/thinkpad_acpi.c index 0d0d6fe7eecd..200e20f90a4b 100644 --- a/drivers/platform/x86/lenovo/thinkpad_acpi.c +++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c @@ -885,7 +885,6 @@ static ssize_t dispatch_proc_write(struct file *file, size_t count, loff_t *pos) { struct ibm_struct *ibm = pde_data(file_inode(file)); - char *kernbuf; int ret; if (!ibm || !ibm->write) @@ -893,16 +892,15 @@ static ssize_t dispatch_proc_write(struct file *file, if (count > PAGE_SIZE - 1) return -EINVAL; - kernbuf = memdup_user_nul(userbuf, count); + char *kernbuf __free(kfree) = memdup_user_nul(userbuf, count); if (IS_ERR(kernbuf)) return PTR_ERR(kernbuf); - ret = ibm->write(kernbuf); - if (ret == 0) - ret = count; - kfree(kernbuf); + ret = ibm->write(kernbuf); + if (ret) + return ret; - return ret; + return count; } static const struct proc_ops dispatch_proc_ops = { @@ -6628,26 +6626,21 @@ static const struct backlight_ops ibm_backlight_data = { static int __init tpacpi_evaluate_bcl(struct acpi_device *adev, void *not_used) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - union acpi_object *obj; acpi_status status; - int rc; status = acpi_evaluate_object(adev->handle, "_BCL", NULL, &buffer); if (ACPI_FAILURE(status)) return 0; - obj = buffer.pointer; + union acpi_object *obj __free(kfree) = buffer.pointer; if (!obj || obj->type != ACPI_TYPE_PACKAGE) { acpi_handle_info(adev->handle, "Unknown _BCL data, please report this to %s\n", TPACPI_MAIL); - rc = 0; - } else { - rc = obj->package.count; + return 0; } - kfree(obj); - return rc; + return obj->package.count; } /* @@ -10989,24 +10982,23 @@ static int auxmac_init(struct ibm_init_struct *iibm) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - union acpi_object *obj; - status = acpi_evaluate_object(NULL, "\\MACA", NULL, &buffer); + strscpy(auxmac, "unavailable", sizeof(auxmac)); + status = acpi_evaluate_object(NULL, "\\MACA", NULL, &buffer); if (ACPI_FAILURE(status)) return -ENODEV; - obj = buffer.pointer; - + union acpi_object *obj __free(kfree) = buffer.pointer; if (obj->type != ACPI_TYPE_STRING || obj->string.length != AUXMAC_STRLEN) { pr_info("Invalid buffer for MAC address pass-through.\n"); - goto auxmacinvalid; + return 0; } if (obj->string.pointer[AUXMAC_BEGIN_MARKER] != '#' || obj->string.pointer[AUXMAC_END_MARKER] != '#') { pr_info("Invalid header for MAC address pass-through.\n"); - goto auxmacinvalid; + return 0; } if (strncmp(obj->string.pointer + AUXMAC_START, "XXXXXXXXXXXX", AUXMAC_LEN) != 0) @@ -11014,13 +11006,7 @@ static int auxmac_init(struct ibm_init_struct *iibm) else strscpy(auxmac, "disabled", sizeof(auxmac)); -free: - kfree(obj); return 0; - -auxmacinvalid: - strscpy(auxmac, "unavailable", sizeof(auxmac)); - goto free; } static struct ibm_struct auxmac_data = { -- 2.55.0.679.g6767b8d81c-goog