From patchwork Fri Feb 18 10:03:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ville Syrjala X-Patchwork-Id: 12751222 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 65E7EC433F5 for ; Fri, 18 Feb 2022 10:05:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E322510F019; Fri, 18 Feb 2022 10:05:09 +0000 (UTC) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 003FE10EEE5; Fri, 18 Feb 2022 10:05:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645178703; x=1676714703; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=R4w61C2KcssCMmhmacISGBGw98IvAAT3IU7Fyo1+BuQ=; b=RpKTTKa3WtDJx24YMxQ+Yv7cu91z5zu9BeL1pwOyyD0VPb8RecFqHsZi +QbNJqpWgUiDhNNmp/HmZ+8B45m+BBt48H5KP1/QYtjvfkIZtCmj6AeTE FJBhUVYIR0W8yvffJLAik/Jm3Oubf7/4hOjb8ULKc7lvNlBKCPrwUc3sJ RJsdpaDmugOCf/vi+xPfbRGsKorwZeUZ81byFNvsprs/hJv22aqnmXEEF kKa7Y1E3Xeshe0XTGsxoom+2j5gtkezEqQJ8YoCuTc2X4fvlWgP/D6eU/ fmk7aUCbc+KCVbVtOKzaQUiYWYp8k7ZOJEw4KRK9M6T475Qgu2cdI624o A==; X-IronPort-AV: E=McAfee;i="6200,9189,10261"; a="311839864" X-IronPort-AV: E=Sophos;i="5.88,378,1635231600"; d="scan'208";a="311839864" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Feb 2022 02:05:02 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,378,1635231600"; d="scan'208";a="530863557" Received: from stinkpipe.fi.intel.com (HELO stinkbox) ([10.237.72.151]) by orsmga007.jf.intel.com with SMTP; 18 Feb 2022 02:04:58 -0800 Received: by stinkbox (sSMTP sendmail emulation); Fri, 18 Feb 2022 12:04:58 +0200 From: Ville Syrjala To: dri-devel@lists.freedesktop.org Subject: [PATCH 12/22] drm/msm: Use drm_mode_copy() Date: Fri, 18 Feb 2022 12:03:53 +0200 Message-Id: <20220218100403.7028-13-ville.syrjala@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220218100403.7028-1-ville.syrjala@linux.intel.com> References: <20220218100403.7028-1-ville.syrjala@linux.intel.com> MIME-Version: 1.0 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: Sean Paul , linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, Abhinav Kumar , freedreno@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Ville Syrjälä struct drm_display_mode embeds a list head, so overwriting the full struct with another one will corrupt the list (if the destination mode is on a list). Use drm_mode_copy() instead which explicitly preserves the list head of the destination mode. Even if we know the destination mode is not on any list using drm_mode_copy() seems decent as it sets a good example. Bad examples of not using it might eventually get copied into code where preserving the list head actually matters. Obviously one case not covered here is when the mode itself is embedded in a larger structure and the whole structure is copied. But if we are careful when copying into modes embedded in structures I think we can be a little more reassured that bogus list heads haven't been propagated in. @is_mode_copy@ @@ drm_mode_copy(...) { ... } @depends on !is_mode_copy@ struct drm_display_mode *mode; expression E, S; @@ ( - *mode = E + drm_mode_copy(mode, &E) | - memcpy(mode, E, S) + drm_mode_copy(mode, E) ) @depends on !is_mode_copy@ struct drm_display_mode mode; expression E; @@ ( - mode = E + drm_mode_copy(&mode, &E) | - memcpy(&mode, E, S) + drm_mode_copy(&mode, E) ) @@ struct drm_display_mode *mode; @@ - &*mode + mode Cc: Rob Clark Cc: Sean Paul Cc: Abhinav Kumar Cc: linux-arm-msm@vger.kernel.org Cc: freedreno@lists.freedesktop.org Signed-off-by: Ville Syrjälä Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 2 +- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 2 +- drivers/gpu/drm/msm/dp/dp_display.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c index 34a6940d12c5..57592052af23 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c @@ -157,7 +157,7 @@ static void dpu_encoder_phys_cmd_mode_set( DPU_ERROR("invalid args\n"); return; } - phys_enc->cached_mode = *adj_mode; + drm_mode_copy(&phys_enc->cached_mode, adj_mode); DPU_DEBUG_CMDENC(cmd_enc, "caching mode:\n"); drm_mode_debug_printmodeline(adj_mode); diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c index e7813c6f7bd9..d5deca07b65a 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c @@ -370,7 +370,7 @@ static void dpu_encoder_phys_vid_mode_set( struct dpu_encoder_irq *irq; if (adj_mode) { - phys_enc->cached_mode = *adj_mode; + drm_mode_copy(&phys_enc->cached_mode, adj_mode); drm_mode_debug_printmodeline(adj_mode); DPU_DEBUG_VIDENC(phys_enc, "caching mode:\n"); } diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 7cc4d21f2091..2ed6028ca8d6 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -825,7 +825,7 @@ static int dp_display_set_mode(struct msm_dp *dp_display, dp = container_of(dp_display, struct dp_display_private, dp_display); - dp->panel->dp_mode.drm_mode = mode->drm_mode; + drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode); dp->panel->dp_mode.bpp = mode->bpp; dp->panel->dp_mode.capabilities = mode->capabilities; dp_panel_init_panel_info(dp->panel);