On Fri, Jun 17, 2016 at 06:54:49PM +0100, Chris Wilson wrote: > During lastclose, we call intel_fbdev_restore_mode() to switch back to > the fbcon configuration on return to VT. However, if we have not yet > finished the asynchronous fbdev initialisation, the current mode will be > invalid and trigger WARNs upon application. > > Serialise with the outstanding initialisation if the first application > exits quickly. Note that to hit this in practice requires using an > unregistered async_domain as otherwise modprobe will force a full > synchronisation prior to init() completing. > > Signed-off-by: Chris Wilson <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93580 Reported-by: Gustav Fägerlind <[email protected]> Reported-by: "Li, Weinan Z" <[email protected]> Cc: [email protected] > --- > drivers/gpu/drm/i915/intel_fbdev.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_fbdev.c > b/drivers/gpu/drm/i915/intel_fbdev.c > index 638e420a59cb..a19d621d8815 100644 > --- a/drivers/gpu/drm/i915/intel_fbdev.c > +++ b/drivers/gpu/drm/i915/intel_fbdev.c > @@ -830,6 +830,11 @@ void intel_fbdev_restore_mode(struct drm_device *dev) > if (!ifbdev) > return; > > + if (ifbdev->cookie) { > + async_synchronize_cookie(ifbdev->cookie + 1); > + ifbdev->cookie = 0; > + } > + > fb_helper = &ifbdev->helper; > > ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); > -- > 2.8.1 > > _______________________________________________ > Intel-gfx mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
