diff --git a/drivers/staging/unisys/visorbus/visorbus_private.h b/drivers/staging/unisys/visorbus/visorbus_private.h
index 8651c87..e878d65 100644
--- a/drivers/staging/unisys/visorbus/visorbus_private.h
+++ b/drivers/staging/unisys/visorbus/visorbus_private.h
@@ -38,12 +38,10 @@ int visorbus_init(void);
 void visorbus_exit(void);
 
 /* visorchannel access functions */
-struct visorchannel *visorchannel_create(u64 physaddr,
-					 unsigned long channel_bytes,
-					 gfp_t gfp, const guid_t *guid);
-struct visorchannel *visorchannel_create_with_lock(u64 physaddr,
-						   unsigned long channel_bytes,
-						   gfp_t gfp, const guid_t *guid);
+struct visorchannel *visorchannel_create(u64 physaddr, gfp_t gfp,
+					 const guid_t *guid);
+struct visorchannel *visorchannel_create_with_lock(u64 physaddr, gfp_t gfp,
+						   const guid_t *guid);
 void visorchannel_destroy(struct visorchannel *channel);
 int visorchannel_read(struct visorchannel *channel, ulong offset,
 		      void *dest, ulong nbytes);
diff --git a/drivers/staging/unisys/visorbus/visorchannel.c b/drivers/staging/unisys/visorbus/visorchannel.c
index 81e428a..49d1f5f 100644
--- a/drivers/staging/unisys/visorbus/visorchannel.c
+++ b/drivers/staging/unisys/visorbus/visorchannel.c
@@ -363,17 +363,8 @@ static int signalinsert_inner(struct visorchannel *channel, u32 queue,
  *                              for a data area in memory, but does NOT modify
  *                              this data area
  * @physaddr:      physical address of start of channel
- * @channel_bytes: size of the channel in bytes; this may 0 if the channel has
- *                 already been initialized in memory (which is true for all
- *                 channels provided to guest environments by the s-Par
- *                 back-end), in which case the actual channel size will be
- *                 read from the channel header in memory
  * @gfp:           gfp_t to use when allocating memory for the data struct
- * @guid:          GUID that identifies channel type; this may 0 if the channel
- *                 has already been initialized in memory (which is true for all
- *                 channels provided to guest environments by the s-Par
- *                 back-end), in which case the actual channel guid will be
- *                 read from the channel header in memory
+ * @guid:          GUID that identifies channel type;
  * @needs_lock:    must specify true if you have multiple threads of execution
  *                 that will be calling visorchannel methods of this
  *                 visorchannel at the same time
@@ -381,11 +372,9 @@ static int signalinsert_inner(struct visorchannel *channel, u32 queue,
  * Return: pointer to visorchannel that was created if successful,
  *         otherwise NULL
  */
-static struct visorchannel *visorchannel_create_guts(
-						u64 physaddr,
-						unsigned long channel_bytes,
-					        gfp_t gfp, const guid_t *guid,
-						bool needs_lock)
+static struct visorchannel *visorchannel_create_guts(u64 physaddr, gfp_t gfp,
+						     const guid_t *guid,
+						     bool needs_lock)
 {
 	struct visorchannel *channel;
 	int err;
@@ -423,35 +412,28 @@ static struct visorchannel *visorchannel_create_guts(
 	channel->physaddr = physaddr;
 	channel->nbytes = size;
 
-	err = visorchannel_read(channel, 0, &channel->chan_hdr,
-				sizeof(struct channel_header));
+	err = visorchannel_read(channel, 0, &channel->chan_hdr, size);
 	if (err)
 		goto err_destroy_channel;
-
-	/* we had better be a CLIENT of this channel */
-	if (channel_bytes == 0)
-		channel_bytes = (ulong)channel->chan_hdr.size;
-	if (guid_is_null(guid))
-		guid = &channel->chan_hdr.chtype;
+	size = (ulong)channel->chan_hdr.size;
 
 	memunmap(channel->mapped);
 	if (channel->requested)
 		release_mem_region(channel->physaddr, channel->nbytes);
 	channel->mapped = NULL;
-	channel->requested = request_mem_region(channel->physaddr,
-						channel_bytes, VISOR_DRV_NAME);
+	channel->requested = request_mem_region(channel->physaddr, size,
+						VISOR_DRV_NAME);
 	if (!channel->requested && !guid_equal(guid, &visor_video_guid))
 		/* we only care about errors if this is not the video channel */
 		goto err_destroy_channel;
 
-	channel->mapped = memremap(channel->physaddr, channel_bytes,
-				   MEMREMAP_WB);
+	channel->mapped = memremap(channel->physaddr, size, MEMREMAP_WB);
 	if (!channel->mapped) {
-		release_mem_region(channel->physaddr, channel_bytes);
+		release_mem_region(channel->physaddr, size);
 		goto err_destroy_channel;
 	}
 
-	channel->nbytes = channel_bytes;
+	channel->nbytes = size;
 	guid_copy(&channel->guid, guid);
 	return channel;
 
@@ -460,20 +442,16 @@ static struct visorchannel *visorchannel_create_guts(
 	return NULL;
 }
 
-struct visorchannel *visorchannel_create(u64 physaddr,
-					 unsigned long channel_bytes,
-					 gfp_t gfp, const guid_t *guid)
+struct visorchannel *visorchannel_create(u64 physaddr, gfp_t gfp,
+					 const guid_t *guid)
 {
-	return visorchannel_create_guts(physaddr, channel_bytes, gfp, guid,
-					false);
+	return visorchannel_create_guts(physaddr, gfp, guid, false);
 }
 
-struct visorchannel *visorchannel_create_with_lock(u64 physaddr,
-						   unsigned long channel_bytes,
-						   gfp_t gfp, const guid_t *guid)
+struct visorchannel *visorchannel_create_with_lock(u64 physaddr, gfp_t gfp,
+						   const guid_t *guid)
 {
-	return visorchannel_create_guts(physaddr, channel_bytes, gfp, guid,
-					true);
+	return visorchannel_create_guts(physaddr, gfp, guid, true);
 }
 
 /**
diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index 0ea20bb..5bafadc 100644
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -567,7 +567,6 @@ static int visorbus_create(struct controlvm_message *inmsg)
 	}
 
 	visorchannel = visorchannel_create(cmd->create_bus.channel_addr,
-					   cmd->create_bus.channel_bytes,
 					   GFP_KERNEL,
 					   &cmd->create_bus.bus_data_type_guid);
 	if (!visorchannel) {
@@ -789,7 +788,6 @@ static int visorbus_device_create(struct controlvm_message *inmsg)
 
 	visorchannel =
 	       visorchannel_create_with_lock(cmd->create_device.channel_addr,
-					     cmd->create_device.channel_bytes,
 					     GFP_KERNEL,
 					     &cmd->create_device.data_type_guid);
 	if (!visorchannel) {
@@ -1326,7 +1324,6 @@ static int controlvm_channel_create(struct visorchipset_device *dev)
 {
 	struct visorchannel *chan;
 	u64 addr;
-	u32 size;
 	int err;
 
 	err = unisys_vmcall(VMCALL_CONTROLVM_ADDR,
@@ -1334,8 +1331,7 @@ static int controlvm_channel_create(struct visorchipset_device *dev)
 	if (err)
 		return err;
 	addr = dev->controlvm_params.address;
-	size = dev->controlvm_params.channel_bytes;
-	chan = visorchannel_create_with_lock(addr, size, GFP_KERNEL,
+	chan = visorchannel_create_with_lock(addr, GFP_KERNEL,
 					     &visor_controlvm_channel_guid);
 	if (!chan)
 		return -ENOMEM;