Konstantin Belousov
2c38cc792e
When creation of the v_pollinfo raced and our instance of vpollinfo ...
must be destroyed, knlist_clear() and seldrain() calls could be
avoided, since vpollinfo was not used. More, the knlist_clear()
calling protocol requires the knlist locked, which is not true at the
call site.
Split the destruction into the helper destroy_vpollinfo_free(), and
call it when raced, instead of destroy_vpollinfo().
Reported and tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
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2c38cc792e