Re: [PATCH] usb-host: workaround libusb bug

["Alex Bennée" <alex.bennee@linaro.org>]

Gerd Hoffmann <kraxel@redhat.com> writes:

> libusb_get_device_speed() does not work for
> libusb_wrap_sys_device() devices in v1.0.23.
>
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1871090
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/usb/host-libusb.c | 37 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
> index c474551d8456..77f1eaa5fe9e 100644
> --- a/hw/usb/host-libusb.c
> +++ b/hw/usb/host-libusb.c
> @@ -39,6 +39,11 @@
>  #endif
>  #include <libusb.h>
>  
> +#ifdef CONFIG_LINUX
> +#include <sys/ioctl.h>
> +#include <linux/usbdevice_fs.h>
> +#endif
> +
>  #include "qapi/error.h"
>  #include "migration/vmstate.h"
>  #include "monitor/monitor.h"
> @@ -885,6 +890,7 @@ static void usb_host_ep_update(USBHostDevice *s)
>  static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
>  {
>      USBDevice *udev = USB_DEVICE(s);
> +    int libusb_speed;
>      int bus_num = 0;
>      int addr = 0;
>      int rc;
> @@ -935,7 +941,36 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
>      usb_ep_init(udev);
>      usb_host_ep_update(s);
>  
> -    udev->speed     = speed_map[libusb_get_device_speed(dev)];
> +    libusb_speed = libusb_get_device_speed(dev);
> +#ifdef CONFIG_LINUX
> +    if (hostfd && libusb_speed == 0) {
> +        /*
> +         * Workaround libusb bug: libusb_get_device_speed() does not
> +         * work for libusb_wrap_sys_device() devices in v1.0.23.
> +         *
> +         * Speeds are defined in linux/usb/ch9.h, file not included
> +         * due to name conflicts.
> +         */
> +        int rc = ioctl(hostfd, USBDEVFS_GET_SPEED, NULL);

This (further) breaks a bunch of the Travis jobs - I assume because libusb doesn't
always have this symbol:

  Compiling C object libcommon.fa.p/hw_input_vhost-user-input.c.o

  ../hw/usb/host-libusb.c: In function ‘usb_host_open’:

  ../hw/usb/host-libusb.c:954:32: error: ‘USBDEVFS_GET_SPEED’ undeclared (first use in this function)

  int rc = ioctl(hostfd, USBDEVFS_GET_SPEED, NULL);

  ^

  ../hw/usb/host-libusb.c:954:32: note: each undeclared identifier is reported only once for each function it appears in

  Makefile.ninja:961: recipe for target 'libcommon.fa.p/hw_usb_host-libusb.c.o' failed

  make: *** [libcommon.fa.p/hw_usb_host-libusb.c.o] Error 1

  make: *** Waiting for unfinished jobs....

-- 
Alex Bennée