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From:   Douglas Anderson <dianders@chromium.org>
To:     Andrzej Hajda <a.hajda@samsung.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
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        Stephen Boyd <swboyd@chromium.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        robdclark@chromium.org,
        Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>,
        linux-arm-msm@vger.kernel.org, Steev Klimaszewski <steev@kali.org>,
        Linus W <linus.walleij@linaro.org>,
        Douglas Anderson <dianders@chromium.org>,
        Boris Brezillon <boris.brezillon@collabora.com>,
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        David Airlie <airlied@linux.ie>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
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        Thomas Zimmermann <tzimmermann@suse.de>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 01/14] drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable()
Date:   Mon, 29 Mar 2021 19:53:32 -0700
Message-Id: <20210329195255.v2.1.If62a003f76a2bc4ccc6c53565becc05d2aad4430@changeid>
In-Reply-To: <20210330025345.3980086-1-dianders@chromium.org>
References: <20210330025345.3980086-1-dianders@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The drm_bridge_chain_pre_enable() is not the proper opposite of
drm_bridge_chain_post_disable(). It continues along the chain to
_before_ the starting bridge. Let's fix that.

Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

(no changes since v1)

 drivers/gpu/drm/drm_bridge.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 64f0effb52ac..044acd07c153 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -522,6 +522,9 @@ void drm_bridge_chain_pre_enable(struct drm_bridge *bridge)
 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
 		if (iter->funcs->pre_enable)
 			iter->funcs->pre_enable(iter);
+
+		if (iter == bridge)
+			break;
 	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_pre_enable);
-- 
2.31.0.291.g576ba9dcdaf-goog