On Wed, Oct 30, 2013 at 02:05:02PM -0200, Paulo Zanoni wrote: > 2013/10/30 Thierry Reding <thierry.reding@xxxxxxxxx>: > > device_unregister() already drops its reference to the struct device, so > > explicitly calling put_device() before device_unregister() can cause the > > device to have been freed before it can be unregistered. > > > > Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> > > I started investigating this problem yesterday and reached the same > conclusion. The connector path can be easily reproduced on i915.ko: > get a machine that has an eDP panel, physically disconnect the panel, > boot the machine, "modprobe i915" and watch the segfault. > > Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > Tested-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > > I didn't really bisect, but I believe this is probably a regression > from "drm/sysfs: sort out minor and connector device object > lifetimes". Yes, I think that's the one that broke it. Thierry
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