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Make sure to check that the active provider pointer points to something before

Description

Make sure to check that the active provider pointer points to something before
dereferencing the pointer.

Sponsored by: Pansas
MFC after: 1 week

Details

Provenance
Matt Jacob <mjacob@FreeBSD.org>Authored on May 14 2010, 4:56 PM
Parents
rG4812aef51078: Controller updates RFA via DMA so driver needs synchronization.
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