From patchwork Wed Oct 7 16:04:12 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: 11820873 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 B3859618 for ; Wed, 7 Oct 2020 15:58:15 +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 7A81720789 for ; Wed, 7 Oct 2020 15:58:15 +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="sBminQ92" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A81720789 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 4D3CA6E93F; Wed, 7 Oct 2020 15:58:14 +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 CC5686E936; Wed, 7 Oct 2020 15:58:12 +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 8373120789; Wed, 7 Oct 2020 15:58:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602086292; bh=HBwtJxagqbtQwZ67Dx8naXj+wlYZpPAKjHhzii40SSg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sBminQ92WVBJEwwafMT2XaIQUmSq/7wGDo+qB95LHJy0g79ZrIWTtmvjjuIlyhn4Z 9yEtPd43j5BDsGcUzvcwnhQ277O6G/ZPA6BpyL779Q0fsxFTeoCOh2tIXEM+KEnG2t ZL8UqyTHDh3i/CmVF7LUqo+0XVsmt1okRgFdFtqA= Date: Wed, 7 Oct 2020 11:04:12 -0500 From: "Gustavo A. R. Silva" To: linux-kernel@vger.kernel.org Subject: [PATCH 03/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_clock_array Message-ID: <661ad1c0e07f4eda264c08b219c8c702d67a9531.1602020074.git.gustavoars@kernel.org> 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_clock_array, 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/5f7c433f.ZyMD+YUIVAwiHGVe%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva --- drivers/gpu/drm/amd/pm/inc/hwmgr.h | 2 +- .../amd/pm/powerplay/hwmgr/process_pptables_v1_0.c | 11 ++++------- .../gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c | 7 +++---- .../amd/pm/powerplay/hwmgr/vega10_processpptables.c | 9 +++------ 4 files changed, 11 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index d68b547743e6..e84cff09af2d 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -91,7 +91,7 @@ struct phm_set_power_state_input { struct phm_clock_array { uint32_t count; - uint32_t values[1]; + uint32_t values[]; }; struct phm_clock_voltage_dependency_record { 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 b760f95e7fa7..52188f6cd150 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 @@ -318,19 +318,16 @@ static int get_valid_clk( phm_ppt_v1_clock_voltage_dependency_table const *clk_volt_pp_table ) { - uint32_t table_size, i; + uint32_t i; struct phm_clock_array *table; phm_ppt_v1_clock_voltage_dependency_record *dep_record; PP_ASSERT_WITH_CODE((0 != clk_volt_pp_table->count), "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(uint32_t) * clk_volt_pp_table->count; - - table = kzalloc(table_size, GFP_KERNEL); - - if (NULL == table) + table = kzalloc(struct_size(table, values, clk_volt_pp_table->count), + GFP_KERNEL); + if (!table) return -ENOMEM; table->count = (uint32_t)clk_volt_pp_table->count; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c index d94a7d8e0587..d9bed4df6f65 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -404,12 +404,11 @@ static int get_valid_clk(struct pp_hwmgr *hwmgr, struct phm_clock_array **ptable, const struct phm_clock_voltage_dependency_table *table) { - unsigned long table_size, i; + unsigned long i; struct phm_clock_array *clock_table; - table_size = sizeof(unsigned long) + sizeof(unsigned long) * table->count; - clock_table = kzalloc(table_size, GFP_KERNEL); - if (NULL == clock_table) + clock_table = kzalloc(struct_size(clock_table, values, table->count), GFP_KERNEL); + if (!clock_table) return -ENOMEM; clock_table->count = (unsigned long)table->count; 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 f29af5ca0aa0..e655c04ccdfb 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -875,17 +875,14 @@ static int get_valid_clk( struct phm_clock_array **clk_table, const phm_ppt_v1_clock_voltage_dependency_table *clk_volt_pp_table) { - uint32_t table_size, i; + uint32_t i; struct phm_clock_array *table; PP_ASSERT_WITH_CODE(clk_volt_pp_table->count, "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(uint32_t) * clk_volt_pp_table->count; - - table = kzalloc(table_size, GFP_KERNEL); - + table = kzalloc(struct_size(table, values, clk_volt_pp_table->count), + GFP_KERNEL); if (!table) return -ENOMEM;