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block: Don't call ROUND_UP with negative values 

The behaviour of the ROUND_UP macro with negative numbers isn't obvious.
It happens to do the right thing in this please, but better avoid it.

Suggested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Kevin Wolf 2014-02-07 16:00:09 +01:00
parent af91f9a73c
commit 5f5bcd80f8
1 changed files with 2 additions and 2 deletions
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block.c
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@ -2915,8 +2915,8 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
}
total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE);
max_nb_sectors = MAX(0, ROUND_UP(total_sectors - sector_num,
align >> BDRV_SECTOR_BITS));
max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num),
align >> BDRV_SECTOR_BITS);
if (max_nb_sectors > 0) {
ret = drv->bdrv_co_readv(bs, sector_num,
MIN(nb_sectors, max_nb_sectors), qiov);