Commit b76876e6 authored by Kevin Wolf's avatar Kevin Wolf
Browse files

ide: Reset current_addr after stopping DMA 



Whenever SSBM is reset in the command register all state information is lost.
Restarting DMA means that current_addr must be reset to the base address of the
PRD table. The OS is not required to change the base address register before
starting a DMA operation, it can reuse the value it wrote for an earlier
request.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
parent c29947bb

hw/ide/pci.c

+1 −1
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ void bmdma_cmd_writeb(void *opaque, uint32_t addr, uint32_t val) 
#endif

            }

        } else {

            bm->cur_addr = bm->addr;

            if (!(bm->status & BM_STATUS_DMAING)) {

                bm->status |= BM_STATUS_DMAING;

                /* start dma transfer if possible */
@@ -101,7 +102,6 @@ static void bmdma_addr_write(IORange *ioport, uint64_t addr, 
#endif

    bm->addr &= ~(mask << shift);

    bm->addr |= ((data & mask) << shift) & ~3;

    bm->cur_addr = bm->addr;

}



const IORangeOps bmdma_addr_ioport_ops = {