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drm/connector: notify userspace on hotplug after register complete 

commit 968d81a64a upstream.

drm connector notifies userspace on hotplug event prematurely before
late_register and mode_object register completes. This leads to a race
between userspace and kernel on updating the IDR list. So, move the
notification to end of connector register.

Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Steve Cohen <cohens@codeaurora.org>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1591155451-10393-1-git-send-email-jsanka@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Jeykumar Sankaran 2020-06-02 20:37:31 -07:00 committed by Greg Kroah-Hartman
parent 35bd59b8b6
commit 50df31ea31
2 changed files with 5 additions and 3 deletions
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5
drivers/gpu/drm/drm_connector.c
View File

@ -27,6 +27,7 @@
#include <drm/drm_print.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_sysfs.h>
#include <linux/uaccess.h>
@ -511,6 +512,10 @@ int drm_connector_register(struct drm_connector *connector)
drm_mode_object_register(connector->dev, &connector->base);
connector->registration_state = DRM_CONNECTOR_REGISTERED;
/* Let userspace know we have a new connector */
drm_sysfs_hotplug_event(connector->dev);
goto unlock;
err_debugfs:

3
drivers/gpu/drm/drm_sysfs.c
View File

@ -293,9 +293,6 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
return PTR_ERR(connector->kdev);
}
/* Let userspace know we have a new connector */
drm_sysfs_hotplug_event(dev);
if (connector->ddc)
return sysfs_create_link(&connector->kdev->kobj,
&connector->ddc->dev.kobj, "ddc");