linux-kernel - [PATCH v1 1/4] drm/bridge: analogix_dp: prevent runing enable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 29 Sep 2016 22:46:37 +0800
From:   zain wang <wzz@...k-chips.com>
To:     Sean Paul <seanpaul@...omium.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Inki Dae <inki.dae@...sung.com>,
        David Airlie <airlied@...ux.ie>
Cc:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Mika Kahola <mika.kahola@...el.com>,
        Stéphane Marchesin <marcheu@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>, dianders@...omium.org,
        Thierry Reding <treding@...dia.com>,
        Krzysztof Kozlowski <k.kozlowski@...sung.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Jingoo Han <jingoohan1@...il.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Yakir Yang <ykk@...k-chips.com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-samsung-soc@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, zain wang <wzz@...k-chips.com>
Subject: [PATCH v1 1/4] drm/bridge: analogix_dp: prevent runing enable_psr when disabled bridge.

When disabled bridge, analogix_dp_enable_psr() may run due to timer was set
by rockchip_drm_do_flush(), in this case we should return -EBUSY.

Signed-off-by: zain wang <wzz@...k-chips.com>

---

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 0f2e423..206529a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -106,6 +106,9 @@ int analogix_dp_enable_psr(struct device *dev)
 	if (!dp->psr_support)
 		return -EINVAL;
 
+	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
+		return -EBUSY;
+
 	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
 	memset(&psr_vsc, 0, sizeof(psr_vsc));
 	psr_vsc.sdp_header.HB0 = 0;
@@ -129,6 +132,9 @@ int analogix_dp_disable_psr(struct device *dev)
 	if (!dp->psr_support)
 		return -EINVAL;
 
+	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
+		return -EBUSY;
+
 	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
 	memset(&psr_vsc, 0, sizeof(psr_vsc));
 	psr_vsc.sdp_header.HB0 = 0;
@@ -1097,6 +1103,8 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
 		return;
 
+	dp->dpms_mode = DRM_MODE_DPMS_OFF;
+
 	if (dp->plat_data->panel) {
 		if (drm_panel_disable(dp->plat_data->panel)) {
 			DRM_ERROR("failed to disable the panel\n");
@@ -1115,8 +1123,6 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 	ret = analogix_dp_prepare_panel(dp, false, true);
 	if (ret)
 		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
-
-	dp->dpms_mode = DRM_MODE_DPMS_OFF;
 }
 
 static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
-- 
1.9.1