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usb_packet_set_state: handle p->ep == NULL

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usb_packet_set_state can be called with p->ep = NULL.  The tracepoint
there tries to log endpoint information, which leads to a segfault.
This patch makes usb_packet_set_state handle the NULL pointer properly.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-03-23 13:34:50 +01:00
parent 39c2057700
commit f5bf14bf39
1 changed files with 11 additions and 6 deletions
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17
hw/usb/core.c
View File

@ -484,12 +484,17 @@ void usb_packet_check_state(USBPacket *p, USBPacketState expected)
void usb_packet_set_state(USBPacket *p, USBPacketState state)
{
USBDevice *dev = p->ep->dev;
USBBus *bus = usb_bus_from_device(dev);
trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr, p,
usb_packet_state_name(p->state),
usb_packet_state_name(state));
if (p->ep) {
USBDevice *dev = p->ep->dev;
USBBus *bus = usb_bus_from_device(dev);
trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr, p,
usb_packet_state_name(p->state),
usb_packet_state_name(state));
} else {
trace_usb_packet_state_change(-1, "", -1, p,
usb_packet_state_name(p->state),
usb_packet_state_name(state));
}
p->state = state;
}