pxa3xx_nand: fix memory out of bound

When fetch nand data with non-DMA mode, we should align info->data_size to
32bit, not 8bit.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

drivers/mtd/nand/pxa3xx_nand.c

@@ -9,6 +9,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
@@ -489,7 +490,7 @@ static int handle_data_pio(struct pxa3xx_nand_info *info)
 	switch (info->state) {
 	case STATE_PIO_WRITING:
 		__raw_writesl(info->mmio_base + NDDB, info->data_buff,
-				info->data_size << 2);
+				DIV_ROUND_UP(info->data_size, 4));
 
 		enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 
@@ -501,7 +502,7 @@ static int handle_data_pio(struct pxa3xx_nand_info *info)
 		break;
 	case STATE_PIO_READING:
 		__raw_readsl(info->mmio_base + NDDB, info->data_buff,
-				info->data_size << 2);
+				DIV_ROUND_UP(info->data_size, 4));
 		break;
 	default:
 		printk(KERN_ERR "%s: invalid state %d\n", __func__,