From: Markus Armbruster <arm...@redhat.com>
usb_msd_init() calls qemu_opts_create() with a made-up ID and false
fail_if_exists. If the ID already exists, it happily messes up those
options, then fails drive_new(), because the BlockDriverState with
that ID already exists, too.
Reproducer: -drive if=none,id=usb0,format=raw -usbdevice disk:tmp.qcow2
Pass true fail_if_exists to qemu_opts_create(), and if it fails, try
the next made-up ID.
The reproducer now succeeds, and creates an usb-storage device with ID
usb1.
Signed-off-by: Markus Armbruster <arm...@redhat.com>
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
hw/usb/dev-storage.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index ae4efcb..eb75f6a 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -666,8 +666,10 @@ static USBDevice *usb_msd_init(USBBus *bus, const char
*filename)
char fmt[32];
/* parse -usbdevice disk: syntax into drive opts */
- snprintf(id, sizeof(id), "usb%d", nr++);
- opts = qemu_opts_create(qemu_find_opts("drive"), id, 0, NULL);
+ do {
+ snprintf(id, sizeof(id), "usb%d", nr++);
+ opts = qemu_opts_create(qemu_find_opts("drive"), id, 1, NULL);
+ } while (!opts);
p1 = strchr(filename, ':');
if (p1++) {
--
1.8.3.1
