[PATCH] drm: Fix GETCONNECTOR regression

[H.J. Lu]

On Tue, Jun 20, 2017 at 2:32 AM, Jani Nikula
<jani.nikula at linux.intel.com> wrote:
> On Tue, 20 Jun 2017, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>> In
>>
>> commit 91eefc05f0ac71902906b2058360e61bd25137fe
>> Author: Daniel Vetter <daniel.vetter at 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 at chromium.org>
>> Cc: Daniel Vetter <daniel.vetter at intel.com>
>> Cc: Jani Nikula <jani.nikula at linux.intel.com>
>> Cc: David Airlie <airlied at linux.ie>
>> Cc: dri-devel at lists.freedesktop.org
>> Reported-by: "H.J. Lu" <hjl.tools at gmail.com>
>> Cc: "H.J. Lu" <hjl.tools at gmail.com>
>> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
>
> Possibly
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100576
>
>> ---
>>  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);
>

Yes, it fixed my issue.

Thanks.

-- 
H.J.