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Avoid divide by zero when there is no block device to migrate

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When block migration is requested and no read-write block device is
present, a divide by zero exception is triggered because
total_sector_sum equals zero.

Signed-off-by: Pierre Riteau <Pierre.Riteau@irisa.fr>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Pierre Riteau 2011-01-12 14:41:00 +01:00 committed by Kevin Wolf
parent 70b4f4bb05
commit 8b6b2afcf8
1 changed files with 6 additions and 1 deletions
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7
block-migration.c
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@ -350,7 +350,12 @@ static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f)
} }
} }
progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum; if (block_mig_state.total_sector_sum != 0) {
progress = completed_sector_sum * 100 /
block_mig_state.total_sector_sum;
} else {
progress = 100;
}
if (progress != block_mig_state.prev_progress) { if (progress != block_mig_state.prev_progress) {
block_mig_state.prev_progress = progress; block_mig_state.prev_progress = progress;
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) qemu_put_be64(f, (progress << BDRV_SECTOR_BITS)