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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 <me@janh.de>
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D8070
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- Fix some comments and whitespace while at it.
MFC after: 1 month
Submitted by: marius@
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- Cleanup some register reads and writes to use existing register
access macros.
- Ensure code which only applies to the control endpoint is not run
for other endpoints in the data transfer path.
MFC after: 3 days
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need work before they work, especially the gadget bindings.
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