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Always check whether dma map is valid before unloading the map.

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When fxp(4) intializes Rx buffers for the first time, there is no
loaded dma map so attempting to unload it is an invalid operation.
This commit is contained in:
Pyun YongHyeon 2009-01-08 04:26:44 +00:00
parent 8550170477
commit e2157cf706
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=186884
1 changed files with 2 additions and 1 deletions
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3
sys/dev/fxp/if_fxp.c
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@ -2545,7 +2545,8 @@ fxp_new_rfabuf(struct fxp_softc *sc, struct fxp_rx *rxp)
return (error);
}
bus_dmamap_unload(sc->fxp_mtag, rxp->rx_map);
if (rxp->rx_mbuf != NULL)
bus_dmamap_unload(sc->fxp_mtag, rxp->rx_map);
tmp_map = sc->spare_map;
sc->spare_map = rxp->rx_map;
rxp->rx_map = tmp_map;