45 lines
1.5 KiB
Diff
45 lines
1.5 KiB
Diff
From cf0ad23ce4dc68d0617b01cc5eefdd133f87cafc Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Sun, 25 Nov 2012 16:49:15 +0100
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Subject: [PATCH] usb: fail usbdevice_create() when there is no USB bus
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Report an error instead of segfaulting when attaching a USB device to a
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machine with no USB busses:
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$ qemu-system-arm -machine vexpress-a9 \
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-sd Fedora-17-armhfp-vexpress-mmcblk0.img \
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-kernel vmlinuz-3.4.2-3.fc17.armv7hl \
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-initrd initramfs-3.4.2-3.fc17.armv7hl.img \
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-usbdevice disk:format=raw:test.img
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Note that the vexpress-a9 machine does not have a USB host controller.
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Reported-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit c128d6a6d785eb9235a4f6dbd52f405ab8c60bee)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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hw/usb/bus.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/usb/bus.c b/hw/usb/bus.c
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index b649360..1f73a52 100644
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--- a/hw/usb/bus.c
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+++ b/hw/usb/bus.c
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@@ -585,6 +585,13 @@ USBDevice *usbdevice_create(const char *cmdline)
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return NULL;
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}
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+ if (!bus) {
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+ error_report("Error: no usb bus to attach usbdevice %s, "
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+ "please try -machine usb=on and check that "
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+ "the machine model supports USB", driver);
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+ return NULL;
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+ }
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+
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if (!f->usbdevice_init) {
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if (*params) {
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error_report("usbdevice %s accepts no params", driver);
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