From 8b6b2afcf85dd5ff33075e93a2e30fbea34c5a55 Mon Sep 17 00:00:00 2001
From: Pierre Riteau <Pierre.Riteau@irisa.fr>
Date: Wed, 12 Jan 2011 14:41:00 +0100
Subject: [PATCH] Avoid divide by zero when there is no block device to migrate
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>
---
block-migration.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/block-migration.c b/block-migration.c
index 14753254d6..60b9fc0ef0 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -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) {
block_mig_state.prev_progress = progress;
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS)
--
2.30.2