From patchwork Wed Oct 7 16:10:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 11820911 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C6E4613B2 for ; Wed, 7 Oct 2020 16:04:18 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9377D217BA for ; Wed, 7 Oct 2020 16:04:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="MJHOYLbu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9377D217BA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8872B6E94C; Wed, 7 Oct 2020 16:04:17 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C31A890BA; Wed, 7 Oct 2020 16:04:16 +0000 (UTC) Received: from embeddedor (187-162-31-110.static.axtel.net [187.162.31.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0E92321707; Wed, 7 Oct 2020 16:04:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602086656; bh=3cmBsuMFJG0w/OcgqfCHa6aItbGr0wGxUb1AbOPczm8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MJHOYLbukTm0WNj7dQ3yrvGHH7JCMjOiLrVlaNeB3+s5+WrFH835OEL1PuMnE77nZ lvD5iNOZn16kE5hLy7W7amlx9MvBm7FCX3Rpsz5nGxKZmTzL69mgZ8DdZUU8dxSPhW qKmsuyaD9KOLNLm1szfnasqAa3X7Sy8wgL9Th2rw= Date: Wed, 7 Oct 2020 11:10:16 -0500 From: "Gustavo A. R. Silva" To: linux-kernel@vger.kernel.org Subject: [PATCH 12/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_ppt_v1_voltage_lookup_table Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , dri-devel@lists.freedesktop.org, "Gustavo A. R. Silva" , amd-gfx@lists.freedesktop.org, linux-hardening@vger.kernel.org, Alex Deucher , Christian =?iso-8859-1?q?K=F6nig?= Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. Refactor the code according to the use of a flexible-array member in struct phm_ppt_v1_voltage_lookup_table, instead of a one-element array, and use the struct_size() helper to calculate the size for the allocation. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays Build-tested-by: kernel test robot Link: https://lore.kernel.org/lkml/5f7d61df.jWrFfnjxGbjSkPOp%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h | 2 +- .../drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c | 10 +++------- .../amd/pm/powerplay/hwmgr/vega10_processpptables.c | 10 +++------- 3 files changed, 7 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h index 923cc04e405a..e11298cdeb30 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h @@ -86,7 +86,7 @@ typedef struct phm_ppt_v1_voltage_lookup_record phm_ppt_v1_voltage_lookup_record struct phm_ppt_v1_voltage_lookup_table { uint32_t count; - phm_ppt_v1_voltage_lookup_record entries[1]; /* Dynamically allocate count entries. */ + phm_ppt_v1_voltage_lookup_record entries[]; /* Dynamically allocate count entries. */ }; typedef struct phm_ppt_v1_voltage_lookup_table phm_ppt_v1_voltage_lookup_table; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c index 5d8016cd1986..426655b9c678 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c @@ -157,7 +157,7 @@ static int get_vddc_lookup_table( uint32_t max_levels ) { - uint32_t table_size, i; + uint32_t i; phm_ppt_v1_voltage_lookup_table *table; phm_ppt_v1_voltage_lookup_record *record; ATOM_Tonga_Voltage_Lookup_Record *atom_record; @@ -165,12 +165,8 @@ static int get_vddc_lookup_table( PP_ASSERT_WITH_CODE((0 != vddc_lookup_pp_tables->ucNumEntries), "Invalid CAC Leakage PowerPlay Table!", return 1); - table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_voltage_lookup_record) * max_levels; - - table = kzalloc(table_size, GFP_KERNEL); - - if (NULL == table) + table = kzalloc(struct_size(table, entries, max_levels), GFP_KERNEL); + if (!table) return -ENOMEM; table->count = vddc_lookup_pp_tables->ucNumEntries; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c index 4f6a73a2cf28..3d7f915381c8 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -1040,18 +1040,14 @@ static int get_vddc_lookup_table( const ATOM_Vega10_Voltage_Lookup_Table *vddc_lookup_pp_tables, uint32_t max_levels) { - uint32_t table_size, i; + uint32_t i; phm_ppt_v1_voltage_lookup_table *table; PP_ASSERT_WITH_CODE((vddc_lookup_pp_tables->ucNumEntries != 0), "Invalid SOC_VDDD Lookup Table!", return 1); - table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_voltage_lookup_record) * max_levels; - - table = kzalloc(table_size, GFP_KERNEL); - - if (table == NULL) + table = kzalloc(struct_size(table, entries, max_levels), GFP_KERNEL); + if (!table) return -ENOMEM; table->count = vddc_lookup_pp_tables->ucNumEntries;