This is a note to let you know that I've just added the patch titled
drm: Fix GETCONNECTOR regression
to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-fix-getconnector-regression.patch
and it can be found in the queue-4.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e94ac3510b6a0f696f2c442c4fc4051c8101ef12 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Tue, 20 Jun 2017 22:28:37 +0200
Subject: drm: Fix GETCONNECTOR regression
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
commit e94ac3510b6a0f696f2c442c4fc4051c8101ef12 upstream.
In
commit 91eefc05f0ac71902906b2058360e61bd25137fe
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
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.
v2: Fix up the error path handling when copy_to_user for the modes
failes (Dhinakaran).
Fixes: 91eefc05f0ac ("drm: Tighten locking in drm_mode_getconnector")
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Reported-by: "H.J. Lu" <hjl.tools@xxxxxxxxx>
Tested-by: "H.J. Lu" <hjl.tools@xxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100576
Cc: "H.J. Lu" <hjl.tools@xxxxxxxxx>
Cc: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@xxxxxxxxx>
Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20170620202837.1701-1-daniel.vetter@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_connector.c | 38 ++++++++++++++++++++------------------
1 file changed, 20 insertions(+), 18 deletions(-)
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1169,21 +1169,6 @@ int drm_mode_getconnector(struct drm_dev
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++;
@@ -1196,7 +1181,7 @@ int drm_mode_getconnector(struct drm_dev
if (put_user(connector->encoder_ids[i],
encoder_ptr + copied)) {
ret = -EFAULT;
- goto out_unref;
+ goto out;
}
copied++;
}
@@ -1240,15 +1225,32 @@ int drm_mode_getconnector(struct drm_dev
if (copy_to_user(mode_ptr + copied,
&u_mode, sizeof(u_mode))) {
ret = -EFAULT;
+ mutex_unlock(&dev->mode_config.mutex);
+
goto out;
}
copied++;
}
}
out_resp->count_modes = mode_count;
-out:
mutex_unlock(&dev->mode_config.mutex);
-out_unref:
+
+ 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);
+
+out:
drm_connector_unreference(connector);
return ret;
Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are
queue-4.11/drm-fix-getconnector-regression.patch