Make Host mode Class drivers only set the class driver instance's state values once...

[pub/USBasp.git] / LUFA / Drivers / USB / Class / Host / MIDI.c

diff --git a/LUFA/Drivers/USB/Class/Host/MIDI.c b/LUFA/Drivers/USB/Class/Host/MIDI.c
index 6f34933..ed958c1 100644 (file)
--- a/LUFA/Drivers/USB/Class/Host/MIDI.c
+++ b/LUFA/Drivers/USB/Class/Host/MIDI.c
@@ -40,38 +40,31 @@ uint8_t MIDI_Host_ConfigurePipes(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceI
                                  uint16_t ConfigDescriptorSize,
                                  void* ConfigDescriptorData)
 {
-       USB_Descriptor_Endpoint_t* DataINEndpoint  = NULL;
-       USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
+       USB_Descriptor_Endpoint_t*  DataINEndpoint  = NULL;
+       USB_Descriptor_Endpoint_t*  DataOUTEndpoint = NULL;
+       USB_Descriptor_Interface_t* MIDIInterface   = NULL;
 
        memset(&MIDIInterfaceInfo->State, 0x00, sizeof(MIDIInterfaceInfo->State));
 
        if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration)
          return MIDI_ENUMERROR_InvalidConfigDescriptor;
 
-       if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
-                                     DCOMP_MIDI_Host_NextMIDIStreamingInterface) != DESCRIPTOR_SEARCH_COMP_Found)
-       {
-               return MIDI_ENUMERROR_NoCompatibleInterfaceFound;
-       }
-       
-       MIDIInterfaceInfo->State.InterfaceNumber = DESCRIPTOR_PCAST(ConfigDescriptorData, USB_Descriptor_Interface_t)->InterfaceNumber;
-
        while (!(DataINEndpoint) || !(DataOUTEndpoint))
        {
-               if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
+               if (!(MIDIInterface) ||
+                   USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
                                              DCOMP_MIDI_Host_NextMIDIStreamingDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
                {
-                       DataINEndpoint  = NULL;
-                       DataOUTEndpoint = NULL;
-
                        if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
                                                                                  DCOMP_MIDI_Host_NextMIDIStreamingInterface) != DESCRIPTOR_SEARCH_COMP_Found)
                        {
                                return MIDI_ENUMERROR_NoCompatibleInterfaceFound;
                        }
 
-                       MIDIInterfaceInfo->State.InterfaceNumber = DESCRIPTOR_PCAST(ConfigDescriptorData,
-                                                                                   USB_Descriptor_Interface_t)->InterfaceNumber;
+                       MIDIInterface = DESCRIPTOR_PCAST(ConfigDescriptorData, USB_Descriptor_Interface_t);
+
+                       DataINEndpoint  = NULL;
+                       DataOUTEndpoint = NULL;
 
                        continue;
                }
@@ -104,6 +97,7 @@ uint8_t MIDI_Host_ConfigurePipes(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceI
                }
        }
 
+       MIDIInterfaceInfo->State.InterfaceNumber = MIDIInterface->InterfaceNumber;
        MIDIInterfaceInfo->State.IsActive = true;
 
        return MIDI_ENUMERROR_NoError;