hw/usb/host-libusb.c: fix build with kernel < 5.0

USBDEVFS_GET_SPEED is used since version 5.2.0 and
https://gitlab.com/qemu-project/qemu/-/commit/202d69a715a4b1824dcd7ec1683d027ed2bae6d3
resulting in the following build failure with kernel < 5.0:

../hw/usb/host-libusb.c: In function 'usb_host_open':
../hw/usb/host-libusb.c:953:32: error: 'USBDEVFS_GET_SPEED' undeclared (first use in this function); did you mean 'USBDEVFS_GETDRIVER'?
         int rc = ioctl(hostfd, USBDEVFS_GET_SPEED, NULL);
                                ^~~~~~~~~~~~~~~~~~
                                USBDEVFS_GETDRIVER

A tentative was made to fix this build failure with
https://gitlab.com/qemu-project/qemu/-/commit/4969e697c15ac536d5c0700381d5d026ef7f0588

However, the assumption that distros with old kernels also have old
libusb is just wrong so also add a check for defined(USBDEVFS_GET_SPEED)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Message-id: 20201213213016.457350-1-fontaine.fabrice@gmail.com

[ kraxel: codestyle whitespace fixup ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index b950501d100f7e695b20e58ce8bf902622742f9e..295d20227ad34fa5c7a7e076c2f52c1a549f7a56 100644 (file)
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -941,7 +941,8 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
     usb_host_ep_update(s);
 
     libusb_speed = libusb_get_device_speed(dev);
-#if LIBUSB_API_VERSION >= 0x01000107 && defined(CONFIG_LINUX)
+#if LIBUSB_API_VERSION >= 0x01000107 && defined(CONFIG_LINUX) && \
+        defined(USBDEVFS_GET_SPEED)
     if (hostfd && libusb_speed == 0) {
         /*
          * Workaround libusb bug: libusb_get_device_speed() does not