From nobody Fri Feb 13 14:10:29 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 864B1CE7A94 for ; Mon, 25 Sep 2023 14:49:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232431AbjIYOtj (ORCPT ); Mon, 25 Sep 2023 10:49:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232370AbjIYOta (ORCPT ); Mon, 25 Sep 2023 10:49:30 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A394103; Mon, 25 Sep 2023 07:49:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695653364; x=1727189364; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=q+/woL1SUetoYx4WHnjb+jA28q5j/h55czCXRHM5v18=; b=EVi4jwC78Q1kyaVDxLOHzLEeZDGfnBCaQC5dthhyBxUmQ34rkB4u6e9r gmFQT2EcKdcqYtGagkSC59CveZKxXn2h6koVUbyd37cNkVrTtg4pfpoyo DOkVf0Uk2U4+emLvjtCRUzxWooTyihQq0n5gCIRATNbZadLCxYVksb/XB loyy79sN03mC6Mr330R9Fqhe+Px9f1fllLNUAJsnIR1vCZQxN9spafy7+ cgnY+X4knkUYGiyuf38lZFAgYvQvlF2HLDQZACEOSVVTN44UqMTHVromg 3rrtTOwSU7FDMsF1ZCIiIH9fo2bVOAyxIq7j608hoJYoXO220zdZsr/ad A==; X-IronPort-AV: E=McAfee;i="6600,9927,10843"; a="378548004" X-IronPort-AV: E=Sophos;i="6.03,175,1694761200"; d="scan'208";a="378548004" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2023 07:49:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10843"; a="995409465" X-IronPort-AV: E=Sophos;i="6.03,175,1694761200"; d="scan'208";a="995409465" Received: from powerlab.fi.intel.com ([10.237.71.25]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2023 07:49:20 -0700 From: Michal Wilczynski To: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev Cc: rafael.j.wysocki@intel.com, andriy.shevchenko@intel.com, lenb@kernel.org, dan.j.williams@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, rui.zhang@intel.com, Michal Wilczynski Subject: [PATCH v1 3/9] ACPI: AC: Remove unnecessary checks Date: Mon, 25 Sep 2023 17:48:36 +0300 Message-ID: <20230925144842.586829-4-michal.wilczynski@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230925144842.586829-1-michal.wilczynski@intel.com> References: <20230925144842.586829-1-michal.wilczynski@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Remove unnecessary checks for NULL for variables that can't be NULL at the point they're checked for it. Defensive programming is discouraged in the kernel. Signed-off-by: Michal Wilczynski --- drivers/acpi/ac.c | 27 ++++----------------------- 1 file changed, 4 insertions(+), 23 deletions(-) diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c index 0b245f9f7ec8..dd04809a787c 100644 --- a/drivers/acpi/ac.c +++ b/drivers/acpi/ac.c @@ -131,9 +131,6 @@ static void acpi_ac_notify(acpi_handle handle, u32 even= t, void *data) struct acpi_device *device =3D data; struct acpi_ac *ac =3D acpi_driver_data(device); =20 - if (!ac) - return; - switch (event) { default: acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", @@ -216,12 +213,8 @@ static const struct dmi_system_id ac_dmi_table[] __in= itconst =3D { static int acpi_ac_add(struct acpi_device *device) { struct power_supply_config psy_cfg =3D {}; - int result =3D 0; - struct acpi_ac *ac =3D NULL; - - - if (!device) - return -EINVAL; + struct acpi_ac *ac; + int result; =20 ac =3D kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); if (!ac) @@ -275,16 +268,9 @@ static int acpi_ac_add(struct acpi_device *device) #ifdef CONFIG_PM_SLEEP static int acpi_ac_resume(struct device *dev) { - struct acpi_ac *ac; + struct acpi_ac *ac =3D acpi_driver_data(to_acpi_device(dev)); unsigned int old_state; =20 - if (!dev) - return -EINVAL; - - ac =3D acpi_driver_data(to_acpi_device(dev)); - if (!ac) - return -EINVAL; - old_state =3D ac->state; if (acpi_ac_get_state(ac)) return 0; @@ -299,12 +285,7 @@ static int acpi_ac_resume(struct device *dev) =20 static void acpi_ac_remove(struct acpi_device *device) { - struct acpi_ac *ac =3D NULL; - - if (!device || !acpi_driver_data(device)) - return; - - ac =3D acpi_driver_data(device); + struct acpi_ac *ac =3D acpi_driver_data(device); =20 acpi_dev_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY, acpi_ac_notify); --=20 2.41.0