On Monday, October 17, 2016 10:20:39 AM Hans Petter Selasky wrote:
> Author: hselasky
> Date: Mon Oct 17 10:20:38 2016
> New Revision: 307518
> URL: https://svnweb.freebsd.org/changeset/base/307518
> Fix device delete child function.
> When detaching device trees parent devices must be detached prior to
> detaching its children. This is because parent devices can have
> pointers to the child devices in their softcs which are not
> invalidated by device_delete_child(). This can cause use after free
> issues and panic().
> Device drivers implementing trees, must ensure its detach function
> detaches or deletes all its children before returning.
> While at it remove now redundant device_detach() calls before
> device_delete_child() and device_delete_children(), mostly in
> the USB controller drivers.
> Tested by: Jan Henrik Sylvester <m...@janh.de>
> Reviewed by: jhb
> Differential Revision: https://reviews.freebsd.org/D8070
> MFC after: 2 weeks
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