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uhci: fix segfault when hot-unplugging uhci controller

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When hot-unplugging the usb controllers (ehci/uhci),
we have to clean all resouce of these devices,
involved registered reset handler. Otherwise, it
may cause NULL pointer access and/or segmentation fault
if we reboot the guest os after hot-unplugging.

Let's hook up reset via DeviceClass->reset() and drop
the qemu_register_reset() call. Then Qemu will register
and unregister the reset handler automatically.

Cc: qemu-stable <qemu-stable@nongnu.org>
Reported-by: Lidonglin <lidonglin@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gonglei 2015-03-18 17:33:46 +08:00 committed by Gerd Hoffmann
parent 8ffd9f4dd4
commit 537e572a7f
1 changed files with 6 additions and 6 deletions
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12
hw/usb/hcd-uhci.c
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@ -348,9 +348,10 @@ static void uhci_update_irq(UHCIState *s)
pci_set_irq(&s->dev, level);
}
static void uhci_reset(void *opaque)
static void uhci_reset(DeviceState *dev)
{
UHCIState *s = opaque;
PCIDevice *d = PCI_DEVICE(dev);
UHCIState *s = DO_UPCAST(UHCIState, dev, d);
uint8_t *pci_conf;
int i;
UHCIPort *port;
@ -454,11 +455,11 @@ static void uhci_port_write(void *opaque, hwaddr addr,
port = &s->ports[i];
usb_device_reset(port->port.dev);
}
uhci_reset(s);
uhci_reset(DEVICE(s));
return;
}
if (val & UHCI_CMD_HCRESET) {
uhci_reset(s);
uhci_reset(DEVICE(s));
return;
}
s->cmd = val;
@ -1230,8 +1231,6 @@ static void usb_uhci_common_realize(PCIDevice *dev, Error **errp)
s->num_ports_vmstate = NB_PORTS;
QTAILQ_INIT(&s->queues);
qemu_register_reset(uhci_reset, s);
memory_region_init_io(&s->io_bar, OBJECT(s), &uhci_ioport_ops, s,
"uhci", 0x20);
@ -1305,6 +1304,7 @@ static void uhci_class_init(ObjectClass *klass, void *data)
k->revision = info->revision;
k->class_id = PCI_CLASS_SERIAL_USB;
dc->vmsd = &vmstate_uhci;
dc->reset = uhci_reset;
if (!info->unplug) {
/* uhci controllers in companion setups can't be hotplugged */
dc->hotpluggable = false;