staging: xgifb: delete offscreen memory management

The offscreen memory area currently conflicts with the video memory
exported to the framebuffer layer. The driver does not utilize offscreen
memory, so the functionality can be deleted.

The patch also eliminates the one last memory leak when the driver
is unloaded.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/xgifb/XGI_main.h

@@ -65,9 +65,6 @@ MODULE_DEVICE_TABLE(pci, xgifb_pci_table);
 
 #define MAX_ROM_SCAN              0x10000
 
-#define OH_ALLOC_SIZE             4000
-#define SENTINEL                  0x7fffffff
-
 #define SEQ_ADR                   0x14
 #define SEQ_DATA                  0x15
 #define DAC_ADR                   0x18
@@ -315,7 +312,6 @@ static int XGIfb_userom = 0;
 /* global flags */
 static int XGIfb_registered;
 static int XGIfb_tvmode = 0;
-static int XGIfb_mem = 0;
 static int XGIfb_pdc = 0;
 static int enable_dstn = 0;
 static int XGIfb_ypan = -1;
@@ -538,31 +534,6 @@ static const struct _chswtable {
 	{ 0,      0,      ""       , ""       }
 };
 
-typedef struct _XGI_OH {
-	struct _XGI_OH *poh_next;
-	struct _XGI_OH *poh_prev;
-	unsigned long offset;
-	unsigned long size;
-} XGI_OH;
-
-typedef struct _XGI_OHALLOC {
-	struct _XGI_OHALLOC *poha_next;
-	XGI_OH aoh[1];
-} XGI_OHALLOC;
-
-typedef struct _XGI_HEAP {
-	XGI_OH oh_free;
-	XGI_OH oh_used;
-	XGI_OH *poh_freelist;
-	XGI_OHALLOC *poha_chain;
-	unsigned long max_freesize;
-} XGI_HEAP;
-
-static unsigned long XGIfb_heap_start;
-static unsigned long XGIfb_heap_end;
-static unsigned long XGIfb_heap_size;
-static XGI_HEAP      XGIfb_heap;
-
 // Eden Chen
 static const struct _XGI_TV_filter {
 	u8 filter[9][4];
@@ -766,15 +737,6 @@ static int      XGIfb_do_set_var(struct fb_var_screeninfo *var, int isactive,
 static void     XGIfb_pre_setmode(void);
 static void     XGIfb_post_setmode(void);
 
-struct XGI_memreq {
-	unsigned long offset;
-	unsigned long size;
-};
-
-/* XGI-specific Export functions */
-void            XGI_malloc(struct XGI_memreq *req);
-void            XGI_free(unsigned long base);
-
 /* Internal hardware access routines */
 void            XGIfb_set_reg4(u16 port, unsigned long data);
 u32             XGIfb_get_reg3(u16 port);
@@ -788,15 +750,6 @@ static void     XGIfb_get_VB_type(void);
 static int      XGIfb_has_VB(void);
 
 
-/* Internal heap routines */
-static int      XGIfb_heap_init(void);
-static XGI_OH   *XGIfb_poh_new_node(void);
-static XGI_OH   *XGIfb_poh_allocate(unsigned long size);
-static void     XGIfb_delete_node(XGI_OH *poh);
-static void     XGIfb_insert_node(XGI_OH *pohList, XGI_OH *poh);
-static XGI_OH   *XGIfb_poh_free(unsigned long base);
-static void     XGIfb_free_node(XGI_OH *poh);
-
 /* Internal routines to access PCI configuration space */
 unsigned char XGIfb_query_VGA_config_space(struct xgi_hw_device_info *pXGIhw_ext,
 					   unsigned long offset,