diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2014-07-09 19:17:30 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2014-07-14 12:03:21 +0200 |
| commit | 58f423fbd5f7f435e8dc56dfa565b043d20d1e1b (patch) | |
| tree | 7d9178c0b85596d3ea4b2565ce1054e8213ce423 /dma-helpers.c | |
| parent | 80504dcaa11097b99842312014f5954a54fe1826 (diff) | |
dma-helpers: Fix too long qiov
If the size of the scatter/gather list isn't a multiple of 512, the
number of sectors for the block layer request is rounded down, resulting
in a qiov that doesn't match the request length. Truncate the qiov to the
new length of the request.
This fixes the IDE qtest case /x86_64/ide/bmdma/short_prdt.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'dma-helpers.c')
| -rw-r--r-- | dma-helpers.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/dma-helpers.c b/dma-helpers.c index 53cbe925d1..499b52bc5a 100644 --- a/dma-helpers.c +++ b/dma-helpers.c @@ -170,6 +170,10 @@ static void dma_bdrv_cb(void *opaque, int ret) return; } + if (dbs->iov.size & ~BDRV_SECTOR_MASK) { + qemu_iovec_discard_back(&dbs->iov, dbs->iov.size & ~BDRV_SECTOR_MASK); + } + dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov, dbs->iov.size / 512, dma_bdrv_cb, dbs); assert(dbs->acb); |