staging: dgnc: cls_uart_struct: adds marker and changes vars' types for sparse

This patch removes these sparse warnings found in the cls.c file:

warning: incorrect type in argument 1 (different address spaces)
  expected void const volatile [noderef] <asn:2>*addr
  got unsigned char volatile *<noident>
warning: incorrect type in argument 2 (different address spaces)
  expected void volatile [noderef] <asn:2>*addr
  got unsigned char volatile *<noident>

The variables passed to readb and writeb need to
be of type u8 with a __iomem marker. These warnings
were popping up everytime the readb and writeb
functions were called with a cls_uart_struct variable.

The change made to the driver.h file adds the marker
to the cls_uart_struct and the changes in cls.h
changes its variables' types.
Signed-off-by: Lidza Louina <lidza.louina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_cls.h

@@ -36,14 +36,14 @@
  ************************************************************************/
 
 struct cls_uart_struct {
-	volatile uchar txrx;		/* WR  RHR/THR - Holding Reg */
-	volatile uchar ier;		/* WR  IER - Interrupt Enable Reg */
-	volatile uchar isr_fcr;		/* WR  ISR/FCR - Interrupt Status Reg/Fifo Control Reg */
-	volatile uchar lcr;		/* WR  LCR - Line Control Reg */
-	volatile uchar mcr;		/* WR  MCR - Modem Control Reg */
-	volatile uchar lsr;		/* WR  LSR - Line Status Reg */
-	volatile uchar msr;		/* WR  MSR - Modem Status Reg */
-	volatile uchar spr;		/* WR  SPR - Scratch Pad Reg */
+	u8 txrx;		/* WR  RHR/THR - Holding Reg */
+	u8 ier;		/* WR  IER - Interrupt Enable Reg */
+	u8 isr_fcr;		/* WR  ISR/FCR - Interrupt Status Reg/Fifo Control Reg */
+	u8 lcr;		/* WR  LCR - Line Control Reg */
+	u8 mcr;		/* WR  MCR - Modem Control Reg */
+	u8 lsr;		/* WR  LSR - Line Status Reg */
+	u8 msr;		/* WR  MSR - Modem Status Reg */
+	u8 spr;		/* WR  SPR - Scratch Pad Reg */
 };
 
 /* Where to read the interrupt register (8bits) */

drivers/staging/dgnc/dgnc_driver.h

@@ -481,7 +481,7 @@ struct channel_t {
 	uchar		ch_mistat;	/* FEP input modem status       */
 
 	struct neo_uart_struct *ch_neo_uart;	/* Pointer to the "mapped" UART struct */
-	struct cls_uart_struct *ch_cls_uart;	/* Pointer to the "mapped" UART struct */
+	struct cls_uart_struct __iomem *ch_cls_uart;	/* Pointer to the "mapped" UART struct */
 
 	uchar		ch_cached_lsr;	/* Cached value of the LSR register */