[Spice-devel] [spice-gtk 10/13] win-usb-dev: maintain list of libusb devices
Yuri Benditovich
yuri.benditovich at daynix.com
Mon Mar 18 14:06:17 UTC 2019
On Tue, Mar 12, 2019 at 7:22 PM Christophe Fergeau
<cfergeau at redhat.com> wrote:>> On Sun, Mar 10, 2019 at 04:46:09PM
+0200, Yuri Benditovich wrote:
> > Change internal device list to maintain libusb devices
> > instead of GUdevDevice objects. Create temporary
> > GUdevDevice object only for indication to usb-dev-manager.
> >
> > Signed-off-by: Yuri Benditovich <yuri.benditovich at daynix.com>
> > ---
> > src/win-usb-dev.c | 80 ++++++++++++++++++++++++++++++-----------------
> > 1 file changed, 51 insertions(+), 29 deletions(-)
> >
> > diff --git a/src/win-usb-dev.c b/src/win-usb-dev.c
> > index 1ab704d..5d878ea 100644
> > --- a/src/win-usb-dev.c
> > +++ b/src/win-usb-dev.c
> > @@ -95,7 +95,7 @@ static void g_udev_device_print_list(GList *l, const gchar *msg);
> > #else
> > static void g_udev_device_print_list(GList *l, const gchar *msg) {}
> > #endif
> > -static void g_udev_device_print(GUdevDevice *udev, const gchar *msg);
> > +static void g_udev_device_print(libusb_device *dev, const gchar *msg);
> >
> > static gboolean g_udev_skip_search(libusb_device *dev);
> >
> > @@ -129,8 +129,6 @@ g_udev_client_list_devices(GUdevClient *self, GList **devs,
> > gssize rc;
> > libusb_device **lusb_list, **dev;
> > GUdevClientPrivate *priv;
> > - GUdevDeviceInfo *udevinfo;
> > - GUdevDevice *udevice;
> > ssize_t n;
> >
> > g_return_val_if_fail(G_UDEV_IS_CLIENT(self), -1);
> > @@ -155,10 +153,7 @@ g_udev_client_list_devices(GUdevClient *self, GList **devs,
> > if (g_udev_skip_search(*dev)) {
> > continue;
> > }
> > - udevinfo = g_new0(GUdevDeviceInfo, 1);
> > - get_usb_dev_info(*dev, udevinfo);
> > - udevice = g_udev_device_new(udevinfo);
> > - *devs = g_list_prepend(*devs, udevice);
> > + *devs = g_list_prepend(*devs, libusb_ref_device(*dev));
> > n++;
> > }
> > libusb_free_device_list(lusb_list, 1);
> > @@ -166,11 +161,17 @@ g_udev_client_list_devices(GUdevClient *self, GList **devs,
> > return n;
> > }
> >
> > +static void unreference_libusb_device(gpointer data)
> > +{
> > + libusb_unref_device((libusb_device *)data);
> > +}
> > +
> > static void g_udev_client_free_device_list(GList **devs)
> > {
> > g_return_if_fail(devs != NULL);
> > if (*devs) {
> > - g_list_free_full(*devs, g_object_unref);
> > + /* avoiding casting of imported procedure to GDestroyNotify */
> > + g_list_free_full(*devs, unreference_libusb_device);
>
> Since all unreference_libusb_device is doing is blindly casting a void *
> to libusb_device *, I'd just use a cast to GDestroyNotify here rather
> than introduce an intermediate method. If you prefer to keep that
> intermediate helper, please remove the commit which I don't think is
> needed.
>
> > *devs = NULL;
> > }
> > }
> > @@ -246,9 +247,22 @@ static void g_udev_client_initable_iface_init(GInitableIface *iface)
> > iface->init = g_udev_client_initable_init;
> > }
> >
> > +static void g_udev_notify_device(GUdevClient *self, libusb_device *dev, int add)
> > +{
> > + GUdevDeviceInfo *udevinfo;
> > + GUdevDevice *udevice;
> > + udevinfo = g_new0(GUdevDeviceInfo, 1);
> > + if (get_usb_dev_info(dev, udevinfo)) {
> > + udevice = g_udev_device_new(udevinfo);
> > + g_signal_emit(self, signals[UEVENT_SIGNAL], 0, udevice, add);
> > + } else {
> > + g_free(udevinfo);
> > + }
> > +}
> > +
> > static void report_one_device(gpointer data, gpointer self)
> > {
> > - g_signal_emit(self, signals[UEVENT_SIGNAL], 0, data, TRUE);
> > + g_udev_notify_device(self, data, TRUE);
> > }
> >
> > void g_udev_client_report_devices(GUdevClient *self)
> > @@ -388,18 +402,20 @@ static gboolean get_usb_dev_info(libusb_device *dev, GUdevDeviceInfo *udevinfo)
> > }
> >
> > /* comparing bus:addr and vid:pid */
> > -static gint gudev_devices_differ(gconstpointer a, gconstpointer b)
> > +static gint compare_libusb_devices(gconstpointer a, gconstpointer b)
> > {
> > - GUdevDeviceInfo *ai, *bi;
> > + libusb_device *a_dev = (libusb_device *)a;
> > + libusb_device *b_dev = (libusb_device *)b;
> > + struct libusb_device_descriptor a_desc, b_desc;
> > gboolean same_bus, same_addr, same_vid, same_pid;
> >
> > - ai = G_UDEV_DEVICE(a)->priv->udevinfo;
> > - bi = G_UDEV_DEVICE(b)->priv->udevinfo;
> > + libusb_get_device_descriptor(a_dev, &a_desc);
> > + libusb_get_device_descriptor(b_dev, &b_desc);
> >
> > - same_bus = (ai->bus == bi->bus);
> > - same_addr = (ai->addr == bi->addr);
> > - same_vid = (ai->vid == bi->vid);
> > - same_pid = (ai->pid == bi->pid);
> > + same_bus = libusb_get_bus_number(a_dev) == libusb_get_bus_number(b_dev);
> > + same_addr = libusb_get_device_address(a_dev) == libusb_get_device_address(b_dev);
> > + same_vid = (a_desc.idVendor == b_desc.idVendor);
> > + same_pid = (a_desc.idProduct == b_desc.idProduct);
> >
> > return (same_bus && same_addr && same_vid && same_pid) ? 0 : -1;
> > }
> > @@ -412,10 +428,17 @@ static void notify_dev_state_change(GUdevClient *self,
> > GList *dev;
> >
> > for (dev = g_list_first(old_list); dev != NULL; dev = g_list_next(dev)) {
> > - if (g_list_find_custom(new_list, dev->data, gudev_devices_differ) == NULL) {
> > - /* Found a device that changed its state */
> > + GList *found = g_list_find_custom(new_list, dev->data, compare_libusb_devices);
> > + if (found == NULL) {
> > g_udev_device_print(dev->data, add ? "add" : "remove");
> > - g_signal_emit(self, signals[UEVENT_SIGNAL], 0, dev->data, add);
> > + g_udev_notify_device(self, dev->data, add);
> > + } else if (add) {
> > + /* keep old existing libusb_device in the new list, when
> > + usb-dev-manager will maintain its own list of libusb_device,
> > + these lists will be completely consistent */
> > + libusb_device *temp = found->data;
> > + found->data = dev->data;
> > + dev->data = temp;
>
> Is this chunk required in this commit for proper behaviour the usb code?
> Or will it be required in some follow-up commit? If it's only going to
> be required later, I'd squash this bit in the commit where it's needed
> so that it's clearer why we want this.
>
When this chunk is not mandatory at this step, it is good in general.
This prevents change in the list of maintained devices when the devices
stays the same. The window receive messages upon any change
related to devices in the OS, not only USB. So I prefer it to be here.
> Apart from these,
>
> Acked-by: Christophe Fergeau <cfergeau at redhat.com>
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