Re: [Qemu-devel] [PATCHv2] usb: Fix usb-bt-dongle initialization.

[Paolo Bonzini <pbonzini@redhat.com>]

Il 18/06/2014 01:23, Hani Benhabiles ha scritto:
> Due to an incomplete initialization, adding a usb-bt-dongle device through HMP
> or QMP will cause a segmentation fault.
>
> Signed-off-by: Hani Benhabiles <hani@linux.com>
> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>
> Compared to v1:
> * Remove duplicate code from usb_bt_init() and inline usb_create_simple() call.
> * usb_bt_initfn() check for s->hci.
>
>  hw/usb/dev-bluetooth.c | 24 ++++++++++++++++--------
>  1 file changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/hw/usb/dev-bluetooth.c b/hw/usb/dev-bluetooth.c
> index a9661d2..a76e581 100644
> --- a/hw/usb/dev-bluetooth.c
> +++ b/hw/usb/dev-bluetooth.c
> @@ -19,6 +19,7 @@
>   */
>
>  #include "qemu-common.h"
> +#include "qemu/error-report.h"
>  #include "hw/usb.h"
>  #include "hw/usb/desc.h"
>  #include "sysemu/bt.h"
> @@ -506,6 +507,14 @@ static int usb_bt_initfn(USBDevice *dev)
>
>      usb_desc_create_serial(dev);
>      usb_desc_init(dev);
> +    s->dev.opaque = s;
> +    if (!s->hci) {
> +        s->hci = bt_new_hci(qemu_find_bt_vlan(0));
> +    }
> +    s->hci->opaque = s;
> +    s->hci->evt_recv = usb_bt_out_hci_packet_event;
> +    s->hci->acl_recv = usb_bt_out_hci_packet_acl;
> +    usb_bt_handle_reset(&s->dev);
>      s->intr = usb_ep_get(dev, USB_TOKEN_IN, USB_EVT_EP);
>
>      return 0;
> @@ -516,6 +525,7 @@ static USBDevice *usb_bt_init(USBBus *bus, const char *cmdline)
>      USBDevice *dev;
>      struct USBBtState *s;
>      HCIInfo *hci;
> +    const char *name = "usb-bt-dongle";
>
>      if (*cmdline) {
>          hci = hci_init(cmdline);
> @@ -525,19 +535,17 @@ static USBDevice *usb_bt_init(USBBus *bus, const char *cmdline)
>
>      if (!hci)
>          return NULL;
> -    dev = usb_create_simple(bus, "usb-bt-dongle");
> +    dev = usb_create(bus, name);
>      if (!dev) {
> +        error_report("Failed to create USB device '%s'", name);
>          return NULL;
>      }
>      s = DO_UPCAST(struct USBBtState, dev, dev);
> -    s->dev.opaque = s;
> -
>      s->hci = hci;
> -    s->hci->opaque = s;
> -    s->hci->evt_recv = usb_bt_out_hci_packet_event;
> -    s->hci->acl_recv = usb_bt_out_hci_packet_acl;
> -
> -    usb_bt_handle_reset(&s->dev);
> +    if (qdev_init(&dev->qdev) < 0) {
> +        error_report("Failed to initialize USB device '%s'", name);
> +        return NULL;
> +    }
>
>      return dev;
>  }
>

Perfect!  My comment about inlining usb_create_simple was a bit cryptic, 
but you got what I meant.  Thanks. :)

Not really trivial, but you've CCed Gerd too.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>