about r4k_dma_cache_inv and r4k_dma_cache_wback_inv in c-r4k.c

[zhuzhenhua <zzh.hust@xxxxxxxxx>]

i see they all call 			
flush_dcache_line(a);	/* Hit_Writeback_Inv_D */

why didn't the r4k_dma_cache_inv call
invalidate_dcache_line(unsigned long addr)        /* Hit_Invalidate_D */;


Best Regards
zhuzhenhua