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-rw-r--r--hw/char/virtio-serial-bus.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index e336bdb..6e2ad82 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -814,12 +814,12 @@ static uint32_t find_free_port_id(VirtIOSerial *vser)
max_nr_ports = vser->serial.max_virtserial_ports;
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
- uint32_t map, bit;
+ uint32_t map, zeroes;
map = vser->ports_map[i];
- bit = ffs(~map);
- if (bit) {
- return (bit - 1) + i * 32;
+ zeroes = ctz32(~map);
+ if (zeroes != 32) {
+ return zeroes + i * 32;
}
}
return VIRTIO_CONSOLE_BAD_ID;
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