Add missing function attributes.

16 files changed, 80 insertions, 47 deletions

diff --git a/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h b/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
index fd42c5022..48b8740fe 100644
--- a/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
+++ b/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
@@ -200,6 +200,7 @@
 			 *
 			 *  \return \ref SPI_MODE_MASTER if the interface is currently in SPI Master mode, \ref SPI_MODE_SLAVE otherwise
 			 */
+			static inline uint8_t SPI_GetCurrentMode(void) ATTR_ALWAYS_INLINE;
 			static inline uint8_t SPI_GetCurrentMode(void)
 			{
 				return (SPCR & SPI_MODE_MASTER);
diff --git a/LUFA/Drivers/USB/Class/Host/Audio.h b/LUFA/Drivers/USB/Class/Host/Audio.h
index dafe9e6fb..2c78b4113 100644
--- a/LUFA/Drivers/USB/Class/Host/Audio.h
+++ b/LUFA/Drivers/USB/Class/Host/Audio.h
@@ -145,6 +145,8 @@
 			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
 			 */
 			uint8_t Audio_Host_StartStopStreaming(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
+			                                      const bool EnableStreaming) ATTR_NON_NULL_PTR_ARG(1);
+			uint8_t Audio_Host_StartStopStreaming(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 			                                      const bool EnableStreaming);
 
 			/** Gets or sets the specified property of a streaming audio class endpoint that is bound to a pipe in the given
@@ -160,7 +162,13 @@
 			 *                                     the retrieved data is to be stored for GET operations.
 			 *
 			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
-			 */			
+			 */
+			uint8_t Audio_Host_GetSetEndpointProperty(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
+			                                          const uint8_t DataPipeIndex,
+			                                          const uint8_t EndpointProperty,
+			                                          const uint8_t EndpointControl,
+			                                          const uint16_t DataLength,
+			                                          void* const Data) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(6);
 			uint8_t Audio_Host_GetSetEndpointProperty(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 			                                          const uint8_t DataPipeIndex,
 			                                          const uint8_t EndpointProperty,
@@ -175,7 +183,8 @@
 			 *
 			 *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class host configuration and state.
 			 */
-			static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo);
+			static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
+			                                      ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 			{
 				(void)AudioInterfaceInfo;
@@ -192,7 +201,7 @@
 			 *  \return Boolean \c true if the given Audio interface has a sample to be read, \c false otherwise.
 			 */
 			static inline bool Audio_Host_IsSampleReceived(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
-			                                                 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                               ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline bool Audio_Host_IsSampleReceived(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 			{
 				if ((USB_HostState != HOST_STATE_Configured) || !(AudioInterfaceInfo->State.IsActive))
@@ -219,7 +228,7 @@
 			 *  \return Boolean \c true if the given Audio interface is ready to accept the next sample, \c false otherwise.
 			 */
 			static inline bool Audio_Host_IsReadyForNextSample(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
-			                                                     ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                                   ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline bool Audio_Host_IsReadyForNextSample(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 			{
 				if ((USB_HostState != HOST_STATE_Configured) || !(AudioInterfaceInfo->State.IsActive))
@@ -239,7 +248,7 @@
 			 *  \return  Signed 8-bit audio sample from the audio interface.
 			 */
 			static inline int8_t Audio_Host_ReadSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
-			                                              ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                            ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline int8_t Audio_Host_ReadSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 			{
 				int8_t Sample;
@@ -268,7 +277,7 @@
 			 *  \return  Signed 16-bit audio sample from the audio interface.
 			 */
 			static inline int16_t Audio_Host_ReadSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
-			                                                ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                              ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline int16_t Audio_Host_ReadSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 			{
 				int16_t Sample;
@@ -297,7 +306,7 @@
 			 *  \return Signed 24-bit audio sample from the audio interface.
 			 */
 			static inline int32_t Audio_Host_ReadSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
-			                                                ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                              ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline int32_t Audio_Host_ReadSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 			{
 				int32_t Sample;
@@ -325,9 +334,9 @@
 			 *  \param[in]     Sample              Signed 8-bit audio sample.
 			 */
 			static inline void Audio_Host_WriteSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
-			                                             const int8_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                           const int8_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void Audio_Host_WriteSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
-			                                             const int8_t Sample)
+			                                           const int8_t Sample)
 			{
 				Pipe_Write_8(Sample);
 
@@ -349,9 +358,9 @@
 			 *  \param[in]     Sample              Signed 16-bit audio sample.
 			 */
 			static inline void Audio_Host_WriteSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
-			                                              const int16_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                            const int16_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void Audio_Host_WriteSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
-			                                              const int16_t Sample)
+			                                            const int16_t Sample)
 			{
 				Pipe_Write_16_LE(Sample);
 
@@ -373,9 +382,9 @@
 			 *  \param[in]     Sample              Signed 24-bit audio sample.
 			 */
 			static inline void Audio_Host_WriteSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
-			                                              const int32_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
+			                                            const int32_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void Audio_Host_WriteSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
-			                                              const int32_t Sample)
+			                                            const int32_t Sample)
 			{
 				Pipe_Write_16_LE(Sample);
 				Pipe_Write_8(Sample >> 16);
@@ -393,9 +402,12 @@
 	#if !defined(__DOXYGEN__)
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_AUDIO_HOST_C)
-				static uint8_t DCOMP_Audio_Host_NextAudioControlInterface(void* CurrentDescriptor);
-				static uint8_t DCOMP_Audio_Host_NextAudioStreamInterface(void* CurrentDescriptor);
-				static uint8_t DCOMP_Audio_Host_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor);
+				static uint8_t DCOMP_Audio_Host_NextAudioControlInterface(void* CurrentDescriptor)
+				                                                          ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_Audio_Host_NextAudioStreamInterface(void* CurrentDescriptor)
+				                                                         ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_Audio_Host_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor)
+				                                                               ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/CDC.h b/LUFA/Drivers/USB/Class/Host/CDC.h
index 9be60947f..59ec1372a 100644
--- a/LUFA/Drivers/USB/Class/Host/CDC.h
+++ b/LUFA/Drivers/USB/Class/Host/CDC.h
@@ -334,12 +334,16 @@
 				#endif
 
 				void CDC_Host_Event_Stub(void) ATTR_CONST;
+				
 				void EVENT_CDC_Host_ControLineStateChanged(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo)
 				                                           ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Host_Event_Stub);
 
-				static uint8_t DCOMP_CDC_Host_NextCDCControlInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_CDC_Host_NextCDCDataInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_CDC_Host_NextCDCInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_CDC_Host_NextCDCControlInterface(void* const CurrentDescriptor)
+				                                                      ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_CDC_Host_NextCDCDataInterface(void* const CurrentDescriptor)
+				                                                   ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_CDC_Host_NextCDCInterfaceEndpoint(void* const CurrentDescriptor)
+				                                                       ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/HID.c b/LUFA/Drivers/USB/Class/Host/HID.c
index 08fb66677..512480b3b 100644
--- a/LUFA/Drivers/USB/Class/Host/HID.c
+++ b/LUFA/Drivers/USB/Class/Host/HID.c
@@ -73,7 +73,7 @@ uint8_t HID_Host_ConfigurePipes(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo
 					 (HIDInterface->Protocol != HIDInterfaceInfo->Config.HIDInterfaceProtocol));
 
 			if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
-			                              DCOMP_HID_Host_NextHID) != DESCRIPTOR_SEARCH_COMP_Found)
+			                              DCOMP_HID_Host_NextHIDDescriptor) != DESCRIPTOR_SEARCH_COMP_Found)
 			{
 				return HID_ENUMERROR_NoCompatibleInterfaceFound;
 			}
@@ -168,7 +168,7 @@ static uint8_t DCOMP_HID_Host_NextHIDInterface(void* const CurrentDescriptor)
 	return DESCRIPTOR_SEARCH_NotFound;
 }
 
-static uint8_t DCOMP_HID_Host_NextHID(void* const CurrentDescriptor)
+static uint8_t DCOMP_HID_Host_NextHIDDescriptor(void* const CurrentDescriptor)
 {
 	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
 
diff --git a/LUFA/Drivers/USB/Class/Host/HID.h b/LUFA/Drivers/USB/Class/Host/HID.h
index a0bef784a..08410f2b1 100644
--- a/LUFA/Drivers/USB/Class/Host/HID.h
+++ b/LUFA/Drivers/USB/Class/Host/HID.h
@@ -290,7 +290,7 @@
 			 *
 			 *  \param[in,out] HIDInterfaceInfo  Pointer to a structure containing a HID Class host configuration and state.
 			 */
-			static inline void HID_Host_USBTask(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo);
+			static inline void HID_Host_USBTask(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 			static inline void HID_Host_USBTask(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo)
 			{
 				(void)HIDInterfaceInfo;
@@ -300,9 +300,12 @@
 	#if !defined(__DOXYGEN__)
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_HID_HOST_C)
-				static uint8_t DCOMP_HID_Host_NextHIDInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_HID_Host_NextHID(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_HID_Host_NextHIDInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_HID_Host_NextHIDInterface(void* const CurrentDescriptor)
+				                                               ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_HID_Host_NextHIDDescriptor(void* const CurrentDescriptor)
+				                                                ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_HID_Host_NextHIDInterfaceEndpoint(void* const CurrentDescriptor)
+				                                                       ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/MIDI.h b/LUFA/Drivers/USB/Class/Host/MIDI.h
index 28bdbfd3e..c4451b117 100644
--- a/LUFA/Drivers/USB/Class/Host/MIDI.h
+++ b/LUFA/Drivers/USB/Class/Host/MIDI.h
@@ -178,8 +178,10 @@
 	#if !defined(__DOXYGEN__)
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_MIDI_HOST_C)
-				static uint8_t DCOMP_MIDI_Host_NextMIDIStreamingInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_MIDI_Host_NextMIDIStreamingInterface(void* const CurrentDescriptor)
+				                                                          ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const CurrentDescriptor)
+				                                                             ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/MassStorage.h b/LUFA/Drivers/USB/Class/Host/MassStorage.h
index 3476e4fa2..497629748 100644
--- a/LUFA/Drivers/USB/Class/Host/MassStorage.h
+++ b/LUFA/Drivers/USB/Class/Host/MassStorage.h
@@ -297,7 +297,7 @@
 			 *
 			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing an Mass Storage Class host configuration and state.
 			 */
-			static inline void MS_Host_USBTask(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo);
+			static inline void MS_Host_USBTask(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void MS_Host_USBTask(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo)
 			{
 				(void)MSInterfaceInfo;
@@ -310,19 +310,21 @@
 
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_MASSSTORAGE_HOST_C)
-				static uint8_t DCOMP_MS_Host_NextMSInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_MS_Host_NextMSInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-
 				static uint8_t MS_Host_SendCommand(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo,
 				                                   MS_CommandBlockWrapper_t* const SCSICommandBlock,
 				                                   const void* const BufferPtr) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 				static uint8_t MS_Host_WaitForDataReceived(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 				static uint8_t MS_Host_SendReceiveData(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo,
 				                                       MS_CommandBlockWrapper_t* const SCSICommandBlock,
-				                                       void* BufferPtr) ATTR_NON_NULL_PTR_ARG(1)  ATTR_NON_NULL_PTR_ARG(2);
+				                                       void* BufferPtr) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 				static uint8_t MS_Host_GetReturnedStatus(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo,
 				                                         MS_CommandStatusWrapper_t* const SCSICommandStatus)
 				                                         ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
+
+				static uint8_t DCOMP_MS_Host_NextMSInterface(void* const CurrentDescriptor)
+				                                             ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_MS_Host_NextMSInterfaceEndpoint(void* const CurrentDescriptor)
+				                                                     ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/Printer.h b/LUFA/Drivers/USB/Class/Host/Printer.h
index 585142d88..d9de036a1 100644
--- a/LUFA/Drivers/USB/Class/Host/Printer.h
+++ b/LUFA/Drivers/USB/Class/Host/Printer.h
@@ -272,8 +272,10 @@
 	#if !defined(__DOXYGEN__)
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_PRINTER_HOST_C)
-				static uint8_t DCOMP_PRNT_Host_NextPRNTInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_PRNT_Host_NextPRNTInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_PRNT_Host_NextPRNTInterface(void* const CurrentDescriptor)
+				                                                 ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_PRNT_Host_NextPRNTInterfaceEndpoint(void* const CurrentDescriptor)
+				                                                         ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/RNDIS.h b/LUFA/Drivers/USB/Class/Host/RNDIS.h
index 97c8a5b8d..f90ed412d 100644
--- a/LUFA/Drivers/USB/Class/Host/RNDIS.h
+++ b/LUFA/Drivers/USB/Class/Host/RNDIS.h
@@ -240,7 +240,7 @@
 			 *
 			 *  \param[in,out] RNDISInterfaceInfo  Pointer to a structure containing an RNDIS Class host configuration and state.
 			 */
-			static inline void RNDIS_Host_USBTask(USB_ClassInfo_RNDIS_Host_t* const RNDISInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
+			static inline void RNDIS_Host_USBTask(USB_ClassInfo_RNDIS_Host_t* const RNDISInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void RNDIS_Host_USBTask(USB_ClassInfo_RNDIS_Host_t* const RNDISInterfaceInfo)
 			{
 				(void)RNDISInterfaceInfo;
@@ -259,9 +259,12 @@
 				                                             const uint16_t Length) ATTR_NON_NULL_PTR_ARG(1)
 				                                             ATTR_NON_NULL_PTR_ARG(2);
 
-				static uint8_t DCOMP_RNDIS_Host_NextRNDISControlInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_RNDIS_Host_NextRNDISDataInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_RNDIS_Host_NextRNDISInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_RNDIS_Host_NextRNDISControlInterface(void* const CurrentDescriptor)
+				                                                          ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_RNDIS_Host_NextRNDISDataInterface(void* const CurrentDescriptor)
+				                                                       ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_RNDIS_Host_NextRNDISInterfaceEndpoint(void* const CurrentDescriptor)
+				                                                           ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Class/Host/StillImage.h b/LUFA/Drivers/USB/Class/Host/StillImage.h
index 66266ef47..2c5c6b1b6 100644
--- a/LUFA/Drivers/USB/Class/Host/StillImage.h
+++ b/LUFA/Drivers/USB/Class/Host/StillImage.h
@@ -295,7 +295,7 @@
 			 *
 			 *  \param[in,out] SIInterfaceInfo  Pointer to a structure containing a Still Image Class host configuration and state.
 			 */
-			static inline void SI_Host_USBTask(USB_ClassInfo_SI_Host_t* const SIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
+			static inline void SI_Host_USBTask(USB_ClassInfo_SI_Host_t* const SIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 			static inline void SI_Host_USBTask(USB_ClassInfo_SI_Host_t* const SIInterfaceInfo)
 			{
 				(void)SIInterfaceInfo;
@@ -308,8 +308,10 @@
 
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_STILLIMAGE_HOST_C)
-				static uint8_t DCOMP_SI_Host_NextSIInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
-				static uint8_t DCOMP_SI_Host_NextSIInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_SI_Host_NextSIInterface(void* const CurrentDescriptor)
+				                                             ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+				static uint8_t DCOMP_SI_Host_NextSIInterfaceEndpoint(void* const CurrentDescriptor)
+				                                                     ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
 			#endif
 	#endif
 
diff --git a/LUFA/Drivers/USB/Core/AVR8/Device_AVR8.h b/LUFA/Drivers/USB/Core/AVR8/Device_AVR8.h
index b5dc7e439..39b4cf7d2 100644
--- a/LUFA/Drivers/USB/Core/AVR8/Device_AVR8.h
+++ b/LUFA/Drivers/USB/Core/AVR8/Device_AVR8.h
@@ -212,6 +212,7 @@
 			}
 		
 			#if (USE_INTERNAL_SERIAL != NO_DESCRIPTOR)
+			static inline void USB_Device_GetSerialString(uint16_t* const UnicodeString) ATTR_NON_NULL_PTR_ARG(1);
 			static inline void USB_Device_GetSerialString(uint16_t* const UnicodeString)
 			{
 				uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
diff --git a/LUFA/Drivers/USB/Core/AVR8/Pipe_AVR8.h b/LUFA/Drivers/USB/Core/AVR8/Pipe_AVR8.h
index efe0ef1ba..2d9972260 100644
--- a/LUFA/Drivers/USB/Core/AVR8/Pipe_AVR8.h
+++ b/LUFA/Drivers/USB/Core/AVR8/Pipe_AVR8.h
@@ -877,7 +877,7 @@
 			 *  \return Boolean \c true if a pipe bound to the given endpoint address of the specified direction is found,
 			 *          \c false otherwise.
 			 */
-			bool Pipe_IsEndpointBound(const uint8_t EndpointAddress);
+			bool Pipe_IsEndpointBound(const uint8_t EndpointAddress) ATTR_WARN_UNUSED_RESULT;
 
 	/* Private Interface - For use in library only: */
 	#if !defined(__DOXYGEN__)
diff --git a/LUFA/Drivers/USB/Core/HostStandardReq.h b/LUFA/Drivers/USB/Core/HostStandardReq.h
index caa42e322..7ef439d84 100644
--- a/LUFA/Drivers/USB/Core/HostStandardReq.h
+++ b/LUFA/Drivers/USB/Core/HostStandardReq.h
@@ -132,7 +132,7 @@
 			 *
 			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum to indicate the result.
 			 */
-			uint8_t USB_Host_GetDeviceDescriptor(void* const DeviceDescriptorPtr);
+			uint8_t USB_Host_GetDeviceDescriptor(void* const DeviceDescriptorPtr) ATTR_NON_NULL_PTR_ARG(1);
 
 			/** Sends a GET DESCRIPTOR standard request to the attached device, requesting the string descriptor
 			 *  of the specified index. This can be used to easily retrieve string descriptors from the device by
@@ -151,7 +151,7 @@
 			 */
 			uint8_t USB_Host_GetDeviceStringDescriptor(const uint8_t Index,
 			                                           void* const Buffer,
-			                                           const uint8_t BufferLength);
+			                                           const uint8_t BufferLength) ATTR_NON_NULL_PTR_ARG(2);
 
 			/** Retrieves the current feature status of the attached device, via a GET STATUS standard request. The
 			 *  retrieved feature status can then be examined by masking the retrieved value with the various
@@ -165,7 +165,7 @@
 			 *
 			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum to indicate the result.
 			 */
-			uint8_t USB_Host_GetDeviceStatus(uint8_t* const FeatureStatus);
+			uint8_t USB_Host_GetDeviceStatus(uint8_t* const FeatureStatus) ATTR_NON_NULL_PTR_ARG(1);
 
 			/** Clears a stall condition on the given pipe, via a CLEAR FEATURE standard request to the attached device.
 			 *
diff --git a/LUFA/Drivers/USB/Core/StdRequestType.h b/LUFA/Drivers/USB/Core/StdRequestType.h
index 356606e3a..e5cadfe6e 100644
--- a/LUFA/Drivers/USB/Core/StdRequestType.h
+++ b/LUFA/Drivers/USB/Core/StdRequestType.h
@@ -167,7 +167,7 @@
 				uint16_t wValue; /**< wValue parameter of the request. */
 				uint16_t wIndex; /**< wIndex parameter of the request. */
 				uint16_t wLength; /**< Length of the data to transfer in bytes. */
-			} USB_Request_Header_t;
+			} ATTR_PACKED USB_Request_Header_t;
 
 		/* Enums: */
 			/** Enumeration for the various standard request commands. These commands are applicable when the
diff --git a/LUFA/Drivers/USB/Core/UC3/Device_UC3.h b/LUFA/Drivers/USB/Core/UC3/Device_UC3.h
index 5ed86612b..55e4b0cf7 100644
--- a/LUFA/Drivers/USB/Core/UC3/Device_UC3.h
+++ b/LUFA/Drivers/USB/Core/UC3/Device_UC3.h
@@ -198,6 +198,7 @@
 			}

 

 			#if (USE_INTERNAL_SERIAL != NO_DESCRIPTOR)

+			static inline void USB_Device_GetSerialString(uint16_t* const UnicodeString) ATTR_NON_NULL_PTR_ARG(1);

 			static inline void USB_Device_GetSerialString(uint16_t* const UnicodeString)

 			{

 				uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();

diff --git a/LUFA/Drivers/USB/Core/UC3/Pipe_UC3.h b/LUFA/Drivers/USB/Core/UC3/Pipe_UC3.h
index c9f9eaac2..ae8f0363c 100644
--- a/LUFA/Drivers/USB/Core/UC3/Pipe_UC3.h
+++ b/LUFA/Drivers/USB/Core/UC3/Pipe_UC3.h
@@ -877,7 +877,7 @@
 			 *  \return Boolean \c true if a pipe bound to the given endpoint address of the specified direction is found,

 			 *          \c false otherwise.

 			 */

-			bool Pipe_IsEndpointBound(const uint8_t EndpointAddress);

+			bool Pipe_IsEndpointBound(const uint8_t EndpointAddress) ATTR_WARN_UNUSED_RESULT;

 

 	/* Private Interface - For use in library only: */

 	#if !defined(__DOXYGEN__)