On Tue, Mar 12, 2019 at 4:11 PM Christophe Fergeau <cfergeau@xxxxxxxxxx> wrote:
>
> On Sun, Mar 10, 2019 at 04:46:08PM +0200, Yuri Benditovich wrote:
> > When processing list of USB devices, avoid allocating memory
> > for devices which later will be skipped. Use existing libusb
> > struct first to check whether the device shall be excluded.
>
> I probably would reword the short log
> "win-usb-dev: do not allocate memory for hub devices"
> -> "win-usb-dev: skip hub devices early in g_udev_client_list_devices"
>
> > -static gboolean g_udev_skip_search(GUdevDevice *udev)
> > +static gboolean g_udev_skip_search(libusb_device *dev)
> > {
> > - GUdevDeviceInfo* udevinfo;
> > gboolean skip;
> > + uint8_t addr = libusb_get_device_address(dev);
> > + struct libusb_device_descriptor desc;
> >
> > - g_return_val_if_fail(G_UDEV_DEVICE(udev), FALSE);
> > -
> > - udevinfo = udev->priv->udevinfo;
> > - g_return_val_if_fail(udevinfo != NULL, FALSE);
> > + libusb_get_device_descriptor(dev, &desc);
>
> Do you know if these
> libusb_get_device_descriptor/libusb_get_device_address are going to be
> expensive compared to using cached values?
These libusb calls use cached values as well
>
> >
> > - skip = ((udevinfo->addr == 0xff) || /* root hub (HCD) */
> > + skip = ((addr == 0xff) || /* root hub (HCD) */
> > #if defined(LIBUSBX_API_VERSION) && (LIBUSBX_API_VERSION >= 0x010000FF)
> > - (udevinfo->addr == 1) || /* root hub addr for libusbx >= 1.0.13 */
> > + (addr == 1) || /* root hub addr for libusbx >= 1.0.13 */
>
> Note for later: I'm not sure this still needs to be conditional as we
> depend on libusb 1.0.16 now.
>
> Looks good otherwise,
>
> Christophe
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