git: if_iwm - Fix iwm_dma_contig_free(). dma->map is always NULL here.

[Imre Vadasz]

commit ef2b29a7ba6ca8a9d2c82ab591c0622227ff84cb
Author: Imre Vadász <imre at vdsz.com>
Date:   Fri Jun 10 02:04:31 2016 +0200

    if_iwm - Fix iwm_dma_contig_free(). dma->map is always NULL here.
    
    * When bus_dmamem_alloc is used, the bus_dmamap_t is set to NULL, so we
      were never actually freeing any dma memory allocations done via
      iwm_dma_contig_alloc(). So we should check dma->vaddr instead of
      dma->map here.
    
    * This reduces dma memory leakage (as displayed by
      "sysctl vm.dma_free_pages") to 11 pages for each if_iwm module
      load/unload cycle.

Summary of changes:
 sys/dev/netif/iwm/if_iwm.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/ef2b29a7ba6ca8a9d2c82ab591c0622227ff84cb


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