commit 1cb0e4339ecd39c62840c74b53546bd28c1ea1a9
Author: Alan Cox <alan@linux.intel.com>
Date:   Tue May 4 20:38:47 2010 +0100

    rar: perform a clean up pass
    
    - Move to a registration model where each RAR is claimed/unclaimed
    - Use that to fix the client stuff (one client per RAR so no need to queue stuff)
    - Support unregister so drivers can rmmod themselves safely
    - Fix locking hang on calling rar lock from rar callback
    - Clean up
    - Kerneldoc
    
    Folded in the memrar update as Greg asked
    
    - Fix various unload related bugs
    - Use the per RAR allocator/deallocator
    - Add kerneldoc
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>

diff --git a/drivers/staging/memrar/memrar_handler.c b/drivers/staging/memrar/memrar_handler.c
index 4bbf66f..281d8d7 100644
--- a/drivers/staging/memrar/memrar_handler.c
+++ b/drivers/staging/memrar/memrar_handler.c
@@ -114,6 +114,7 @@ struct memrar_rar_info {
 	struct memrar_allocator *allocator;
 	struct memrar_buffer_info buffers;
 	struct mutex lock;
+	int allocated;	/* True if we own this RAR */
 };
 
 /*
@@ -150,11 +151,13 @@ static struct memrar_rar_info *memrar_get_rar_info(u32 vaddr)
 	return NULL;
 }
 
-/*
- * Retrieve bus address from given handle.
+/**
+ *	memrar_get_bus address		-	handle to bus address
+ *
+ *	Retrieve bus address from given handle.
  *
- * Returns address corresponding to given handle.  Zero if handle is
- * invalid.
+ *	Returns address corresponding to given handle.  Zero if handle is
+ *	invalid.
  */
 static dma_addr_t memrar_get_bus_address(
 	struct memrar_rar_info *rar,
@@ -176,11 +179,13 @@ static dma_addr_t memrar_get_bus_address(
 	return rar->base + (vaddr - iobase);
 }
 
-/*
- * Retrieve physical address from given handle.
+/**
+ *	memrar_get_physical_address	-	handle to physical address
+ *
+ *	Retrieve physical address from given handle.
  *
- * Returns address corresponding to given handle.  Zero if handle is
- * ...
[ message continues ]