| Message ID | 1426811056-2202-4-git-send-email-jsnow@redhat.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c index e1ae36f..7a223be 100644 --- a/hw/ide/ahci.c +++ b/hw/ide/ahci.c @@ -799,7 +799,7 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist, qemu_sglist_init(sglist, qbus->parent, (sglist_alloc_hint - off_idx), ad->hba->as); - qemu_sglist_add(sglist, le64_to_cpu(tbl[off_idx].addr + off_pos), + qemu_sglist_add(sglist, le64_to_cpu(tbl[off_idx].addr) + off_pos, prdt_tbl_entry_size(&tbl[off_idx]) - off_pos); for (i = off_idx + 1; i < sglist_alloc_hint; i++) {
This does not bother DMA, because DMA generally transfers the entire SGList in one shot if it can. PIO, on the other hand, tries to transfer just one sector at a time, and will make multiple visits to the sglist to fetch memory addresses. Fix the memory address calculaton when we have an offset by moving the offset addition OUTSIDE of the le64_to_cpu calculation. Signed-off-by: John Snow <jsnow@redhat.com> --- hw/ide/ahci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)