Roger Pau Monné de06f02ea4 xen: check if there are clients waiting in gnttab_end_foreign_access_references
Without a call to check_free_callbacks() clients waiting for grant
references would not be woken up even when there are sufficient grant
references available.

The check was likely left out as a mistake when the function was first
added.

Note that other functions used to free grant references already call
check_free_callbacks.

Submitted by:		pratyush
Reviewed by:		royger
Differential review:	https://reviews.freebsd.org/D15899
2018-06-21 15:47:47 +00:00
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