Only try to set configuration if needed.

2 files changed, 10 insertions, 3 deletions

diff --git a/usbmuxd/usb-linux.c b/usbmuxd/usb-linux.c
index 6e99a95..9634d14 100644
--- a/usbmuxd/usb-linux.c
+++ b/usbmuxd/usb-linux.c
@@ -279,11 +279,19 @@ static int usb_discover(void)
                         usbmuxd_log(LL_WARNING, "Could not open device %d-%d: %d", bus, address, res);
                         continue;
                 }
-                if((res = libusb_set_configuration(handle, USB_CONFIGURATION)) != 0) {
-                        usbmuxd_log(LL_WARNING, "Could not set configuration %d for device %d-%d: %d", USB_CONFIGURATION, bus, address, res);
+                int current_config = 0;
+                if((res = libusb_get_configuration(handle, &current_config)) != 0) {
+                        usbmuxd_log(LL_WARNING, "Could not get configuration for device %d-%d: %d", bus, address, res);
                         libusb_close(handle);
                         continue;
                 }
+                if (current_config != devdesc.bNumConfigurations) {
+                        if((res = libusb_set_configuration(handle, devdesc.bNumConfigurations)) != 0) {
+                                usbmuxd_log(LL_WARNING, "Could not set configuration %d for device %d-%d: %d", devdesc.bNumConfigurations, bus, address, res);
+                                libusb_close(handle);
+                                continue;
+                        }
+                }
                 if((res = libusb_claim_interface(handle, USB_INTERFACE)) != 0) {
                         usbmuxd_log(LL_WARNING, "Could not claim interface %d for device %d-%d: %d", USB_INTERFACE, bus, address, res);
                         libusb_close(handle);
diff --git a/usbmuxd/usb.h b/usbmuxd/usb.h
index d13d9ba..621ccb2 100644
--- a/usbmuxd/usb.h
+++ b/usbmuxd/usb.h
@@ -48,7 +48,6 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #define PID_ITOUCH2G 0x1293
 #define PID_IPHONE3GS 0x1294
 
-#define USB_CONFIGURATION 3
 #define USB_INTERFACE 1
 
 struct usb_device;