NextBSD/src c3f5e53sys/dev/e1000 if_lem.c

Partial workaround for Intel PCI adapters reading past the end of the
host-programmed DMA regions.  This change seemingly fixes the
descriptor fetches, but the packet memory accesses are left
problematic.

Reviewed by:    emaste, erj, sbruno
Sponsored by:   The FreeBSD Foundation
MFC after:      2 weeks
Differential revision:  https://reviews.freebsd.org/D8282
DeltaFile
+15-4sys/dev/e1000/if_lem.c
+15-41 files

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