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ide: Fix ide_dma_cancel 

When cancelling a request, bdrv_aio_cancel may decide that it waits for
completion of a request rather than for cancellation. IDE therefore can't
abandon its DMA status before calling bdrv_aio_cancel; otherwise the callback
of a completed request would use invalid data.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2010-05-04 16:35:24 +02:00
parent 20be49e47e
commit 38d8dfa193
1 changed files with 4 additions and 4 deletions
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8
hw/ide/core.c
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@ -2838,10 +2838,6 @@ static void ide_dma_restart(IDEState *s, int is_read)
void ide_dma_cancel(BMDMAState *bm)
{
if (bm->status & BM_STATUS_DMAING) {
bm->status &= ~BM_STATUS_DMAING;
/* cancel DMA request */
bm->unit = -1;
bm->dma_cb = NULL;
if (bm->aiocb) {
#ifdef DEBUG_AIO
printf("aio_cancel\n");
@ -2849,6 +2845,10 @@ void ide_dma_cancel(BMDMAState *bm)
bdrv_aio_cancel(bm->aiocb);
bm->aiocb = NULL;
}
bm->status &= ~BM_STATUS_DMAING;
/* cancel DMA request */
bm->unit = -1;
bm->dma_cb = NULL;
}
}