drm: Don't race connector registration

I was under the misconception that the sysfs dev stuff can be fully
set up, and then registered all in one step with device_add. That's
true for properties and property groups, but not for parents and child
devices. Those must be fully registered before you can register a
child.

Add a bit of tracking to make sure that asynchronous mst connector
hotplugging gets this right. For consistency we rely upon the implicit
barriers of the connector->mutex, which is taken anyway, to ensure
that at least either the connector or device registration call will
work out.

Mildly tested since I can't reliably reproduce this on my mst box
here.

Reported-by: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1484237756-2720-1-git-send-email-daniel.vetter@ffwll.ch

path: root/tstamping.h

#ifndef TSTAMPING_H
#define TSTAMPING_H

#include "config.h"

#ifdef HAVE_HARDWARE_TIMESTAMPING
extern int set_sockopt_hwtimestamp(int sock, const char *dev);
#else
static inline int set_sockopt_hwtimestamp(int sock, const char *dev)
{
	return -1;
}
#endif

#endif /* TSTAMPING_H */