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cxgbei: Explicitly clear the page pode reservation pointer after freeing it.
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Authored by jhb on Apr 22 2021, 9:27 PM.

Details

Summary

A single union ctl_io can be reused across multiple transfers (in
particular by the ramdisk backend). On a reuse, the reservation
pointer would retain its value from the previous transfer tripping an
assertion.

Reported by: Jithesh Arakkan @ Chelsio

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R10 FreeBSD src repository
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