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/freebsd-11-stable/sys/dev/if_ndis/
H A Dif_ndis_usb.cdiff 189950 Wed Mar 18 00:53:12 MDT 2009 weongyo Some NDIS USB drivers try to call URB funcs like URB_FUNCTION_VENDOR_xxx
or URB_FUNCTION_CLASS_xxx with HAL preemption lock that means it's
non-sleepable during USB requests though usb2_do_request() requires a
sleep so it needs to send queries to the default pipe without those
interfaces to avoid sleep.
H A Dif_ndisvar.hdiff 189950 Wed Mar 18 00:53:12 MDT 2009 weongyo Some NDIS USB drivers try to call URB funcs like URB_FUNCTION_VENDOR_xxx
or URB_FUNCTION_CLASS_xxx with HAL preemption lock that means it's
non-sleepable during USB requests though usb2_do_request() requires a
sleep so it needs to send queries to the default pipe without those
interfaces to avoid sleep.

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