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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: "H.J. Lu" <hjl.tools@gmail.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH] drm: Fix GETCONNECTOR regression
Date: Tue, 20 Jun 2017 11:16:05 +0200	[thread overview]
Message-ID: <20170620091605.3749-1-daniel.vetter@ffwll.ch> (raw)

In

commit 91eefc05f0ac71902906b2058360e61bd25137fe
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Dec 14 00:08:10 2016 +0100

    drm: Tighten locking in drm_mode_getconnector

I reordered the logic a bit in that IOCTL, but that broke userspace
since it'll get the new mode list, but not the new property values.
Fix that again.

Fixes: 91eefc05f0ac ("drm: Tighten locking in drm_mode_getconnector")
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Reported-by: "H.J. Lu" <hjl.tools@gmail.com>
Cc: "H.J. Lu" <hjl.tools@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_connector.c | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 5cd61aff7857..e0fd8168a178 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1293,21 +1293,6 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
 	if (!connector)
 		return -ENOENT;
 
-	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-	encoder = drm_connector_get_encoder(connector);
-	if (encoder)
-		out_resp->encoder_id = encoder->base.id;
-	else
-		out_resp->encoder_id = 0;
-
-	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
-			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
-			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
-			&out_resp->count_props);
-	drm_modeset_unlock(&dev->mode_config.connection_mutex);
-	if (ret)
-		goto out_unref;
-
 	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
 		if (connector->encoder_ids[i] != 0)
 			encoders_count++;
@@ -1372,6 +1357,24 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
 	out_resp->count_modes = mode_count;
 out:
 	mutex_unlock(&dev->mode_config.mutex);
+
+	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
+	encoder = drm_connector_get_encoder(connector);
+	if (encoder)
+		out_resp->encoder_id = encoder->base.id;
+	else
+		out_resp->encoder_id = 0;
+
+	/* Only grab properties after probing, to make sure EDID and other
+	 * properties reflect the latest status. */
+	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
+			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
+			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
+			&out_resp->count_props);
+	drm_modeset_unlock(&dev->mode_config.connection_mutex);
+	if (ret)
+		goto out_unref;
+
 out_unref:
 	drm_connector_put(connector);
 
-- 
2.11.0

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             reply	other threads:[~2017-06-20  9:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-20  9:16 Daniel Vetter [this message]
2017-06-20  9:32 ` [PATCH] drm: Fix GETCONNECTOR regression Jani Nikula
2017-06-20 16:24   ` H.J. Lu
2017-06-20 18:50 ` Daniel Vetter
2017-06-20 19:32 ` [Intel-gfx] " Pandiyan, Dhinakaran
2017-06-20 20:29   ` Daniel Vetter
  -- strict thread matches above, loose matches on Subject: below --
2017-06-20 20:28 Daniel Vetter
2017-06-20 21:40 ` Sean Paul
2017-06-21  7:51   ` Daniel Vetter

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