From patchwork Mon Nov 7 19:25:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= X-Patchwork-Id: 13035170 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 B9AFDC4332F for ; Mon, 7 Nov 2022 19:26:21 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B4D6D10E3AB; Mon, 7 Nov 2022 19:26:17 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id EE9B610E3A3 for ; Mon, 7 Nov 2022 19:26:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667849171; x=1699385171; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=pLqm1QgEZZjJt/2JM8FqPTfV0l2zyKImmtAMSKtBXaE=; b=F03BLpg0nakG1Rx6DBxQmWOaHfL9mWtD00PVAU/nO1+kZr8AtYGN4bS3 uQ2T8kYqMUomlBEmDj+64+YNP75U861fKR7VaaLbETNTg199s5BXmXfTs h68OdVyeDM1pdzMaZrT/knGrXiM5+fVBWoixeIVHLzttzEva+L+KEUVV5 IYoJy6T0Nt4XXCTxnFRIQwnIGGs9OGjzr4/0mRgZXyrxf+BOAWp5Fu2EJ tcV/5/Em0rMmbVojSioFBnMN8q8SNg7vMPlCRAkLuk/e3CmEy+KKSlKZR x72wfpq852P7ZuJRCm7xUFvDsgXnaF1Lb7pNPDBbh6wrXPhHfMUNAdsFu A==; X-IronPort-AV: E=McAfee;i="6500,9779,10524"; a="308125651" X-IronPort-AV: E=Sophos;i="5.96,145,1665471600"; d="scan'208";a="308125651" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2022 11:26:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10524"; a="705009825" X-IronPort-AV: E=Sophos;i="5.96,145,1665471600"; d="scan'208";a="705009825" Received: from stinkpipe.fi.intel.com (HELO stinkbox) ([10.237.72.191]) by fmsmga004.fm.intel.com with SMTP; 07 Nov 2022 11:26:09 -0800 Received: by stinkbox (sSMTP sendmail emulation); Mon, 07 Nov 2022 21:26:08 +0200 From: Ville Syrjala To: dri-devel@lists.freedesktop.org Subject: [PATCH v2 6/7] drm/rockchip: Use drm_mode_copy() Date: Mon, 7 Nov 2022 21:25:44 +0200 Message-Id: <20221107192545.9896-7-ville.syrjala@linux.intel.com> X-Mailer: git-send-email 2.37.4 In-Reply-To: <20221107192545.9896-1-ville.syrjala@linux.intel.com> References: <20221107192545.9896-1-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: linux-rockchip@lists.infradead.org, Sandy Huang , linux-arm-kernel@lists.infradead.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 Signed-off-by: Ville Syrjälä Cc: Sandy Huang Cc: "Heiko Stübner" Cc: linux-arm-kernel@lists.infradead.org Cc: linux-rockchip@lists.infradead.org --- drivers/gpu/drm/rockchip/cdn-dp-core.c | 2 +- drivers/gpu/drm/rockchip/inno_hdmi.c | 2 +- drivers/gpu/drm/rockchip/rk3066_hdmi.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c index 518ee13b1d6f..8526dda91931 100644 --- a/drivers/gpu/drm/rockchip/cdn-dp-core.c +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c @@ -571,7 +571,7 @@ static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder, video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC); video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC); - memcpy(&dp->mode, adjusted, sizeof(*mode)); + drm_mode_copy(&dp->mode, adjusted); } static bool cdn_dp_check_link_status(struct cdn_dp_device *dp) diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c index 87b2243ea23e..f51774866f41 100644 --- a/drivers/gpu/drm/rockchip/inno_hdmi.c +++ b/drivers/gpu/drm/rockchip/inno_hdmi.c @@ -499,7 +499,7 @@ static void inno_hdmi_encoder_mode_set(struct drm_encoder *encoder, inno_hdmi_setup(hdmi, adj_mode); /* Store the display mode for plugin/DPMS poweron events */ - memcpy(&hdmi->previous_mode, adj_mode, sizeof(hdmi->previous_mode)); + drm_mode_copy(&hdmi->previous_mode, adj_mode); } static void inno_hdmi_encoder_enable(struct drm_encoder *encoder) diff --git a/drivers/gpu/drm/rockchip/rk3066_hdmi.c b/drivers/gpu/drm/rockchip/rk3066_hdmi.c index cf2cf51091a3..90145ad96984 100644 --- a/drivers/gpu/drm/rockchip/rk3066_hdmi.c +++ b/drivers/gpu/drm/rockchip/rk3066_hdmi.c @@ -395,7 +395,7 @@ rk3066_hdmi_encoder_mode_set(struct drm_encoder *encoder, struct rk3066_hdmi *hdmi = encoder_to_rk3066_hdmi(encoder); /* Store the display mode for plugin/DPMS poweron events. */ - memcpy(&hdmi->previous_mode, adj_mode, sizeof(hdmi->previous_mode)); + drm_mode_copy(&hdmi->previous_mode, adj_mode); } static void rk3066_hdmi_encoder_enable(struct drm_encoder *encoder)