Staging: unisys: Fixup sparse warnings for dereferencing noderef types.

Fixed the usage of the following so they don't try to dereference
pointers to iomem.
	CHANNEL_U64_MISMATCH
	CHANNEL_U32_MISMATCH
	wait_for_valid_guid

Signed-off-by: Ken Cox <jkc@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/common-spar/include/channels/channel.h

@@ -333,8 +333,9 @@ ULTRA_check_channel_client(void __iomem *pChannel,
 			   (pChannel))->Size) < expectedMinBytes) {
 			CHANNEL_U64_MISMATCH(expectedTypeGuid, channelName,
 					     "size", expectedMinBytes,
-					     ((CHANNEL_HEADER __iomem *)
-					      (pChannel))->Size, fileName,
+					     readq(&((CHANNEL_HEADER __iomem *)
+						     (pChannel))->Size),
+					     fileName,
 					     lineNumber, logCtx);
 			return 0;
 		}
@@ -344,9 +345,9 @@ ULTRA_check_channel_client(void __iomem *pChannel,
 		    != expectedVersionId) {
 			CHANNEL_U32_MISMATCH(expectedTypeGuid, channelName,
 					     "version", expectedVersionId,
-					     ((CHANNEL_HEADER __iomem *)
-					      (pChannel))->VersionId, fileName,
-					     lineNumber, logCtx);
+					     readl(&((CHANNEL_HEADER __iomem *)
+						     (pChannel))->VersionId),
+					     fileName, lineNumber, logCtx);
 			return 0;
 		}
 	if (expectedSignature > 0)	/* caller wants us to verify
@@ -355,8 +356,9 @@ ULTRA_check_channel_client(void __iomem *pChannel,
 		    != expectedSignature) {
 			CHANNEL_U64_MISMATCH(expectedTypeGuid, channelName,
 					     "signature", expectedSignature,
-					     ((CHANNEL_HEADER __iomem *)
-					      (pChannel))->Signature, fileName,
+					     readq(&((CHANNEL_HEADER __iomem *)
+						     (pChannel))->Signature),
+					     fileName,
 					     lineNumber, logCtx);
 			return 0;
 		}

drivers/staging/unisys/include/uisutils.h

@@ -194,14 +194,21 @@ struct chaninfo {
  * correctly at DEVICE_CREATE time, INSTEAD OF waiting until
  * DEVICE_CONFIGURE time.
  */
-#define WAIT_FOR_VALID_GUID(guid) \
-	do {						   \
-		while (uuid_le_cmp(guid, NULL_UUID_LE) == 0) {	\
-			LOGERR("Waiting for non-0 GUID (why???)...\n"); \
-			UIS_THREAD_WAIT_SEC(5);				\
-		}							\
-		LOGERR("OK... GUID is non-0 now\n");			\
-	} while (0)
+static inline void
+wait_for_valid_guid(uuid_le __iomem *guid)
+{
+	uuid_le tmpguid;
+
+	while (1) {
+		memcpy_fromio((void *)&tmpguid,
+			      (void __iomem *)guid, sizeof(uuid_le));
+		if (uuid_le_cmp(tmpguid, NULL_UUID_LE) != 0)
+			break;
+		LOGERR("Waiting for non-0 GUID (why???)...\n");
+		UIS_THREAD_WAIT_SEC(5);
+	}
+	LOGERR("OK... GUID is non-0 now\n");
+}
 
 /* CopyFragsInfoFromSkb returns the number of entries added to frags array
  * Returns -1 on failure.

drivers/staging/unisys/uislib/uislib.c

@@ -447,7 +447,7 @@ create_device(CONTROLVM_MESSAGE *msg, char *buf)
 				struct guest_msgs cmd;
 				if (!uuid_le_cmp(dev->channelTypeGuid,
 				     UltraVhbaChannelProtocolGuid)) {
-					WAIT_FOR_VALID_GUID(((CHANNEL_HEADER
+					wait_for_valid_guid(&((CHANNEL_HEADER
 							      __iomem *) (dev->
 								  chanptr))->
 							    Type);
@@ -472,7 +472,7 @@ create_device(CONTROLVM_MESSAGE *msg, char *buf)
 				} else
 				    if (!uuid_le_cmp(dev->channelTypeGuid,
 					 UltraVnicChannelProtocolGuid)) {
-					WAIT_FOR_VALID_GUID(((CHANNEL_HEADER
+					wait_for_valid_guid(&((CHANNEL_HEADER
 							      __iomem *) (dev->
 								  chanptr))->
 							    Type);