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usb-storage: Fix how legacy init handles option ID clash 

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 <armbru@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Markus Armbruster 2014-09-12 21:24:34 +02:00 committed by Gerd Hoffmann
parent 07e2863d02
commit 31376776d0
1 changed files with 4 additions and 2 deletions
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6
hw/usb/dev-storage.c
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@ -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++) {