mtd: OneNAND: Fix page offset handling at 2KiB pagesize

When use the 2KiB pagesize, it should be set the correct page offset.

Signed-off-by: Kyungmin Park <[e-mail]>
Signed-off-by: Artem Bityutskiy <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/onenand/samsung.c

···
 	void __iomem *p;
 	void *buf = (void *) buffer;
 	dma_addr_t dma_src, dma_dst;
-	int err, page_dma = 0;
+	int err, ofs, page_dma = 0;
 	struct device *dev = &onenand->pdev->dev;
 
 	p = this->base + area;
···
 		if (!page)
 			goto normal;
 
+		/* Page offset */
+		ofs = ((size_t) buf & ~PAGE_MASK);
 		page_dma = 1;
+
 		/* DMA routine */
 		dma_src = onenand->phys_base + (p - this->base);
-		dma_dst = dma_map_page(dev, page, 0, count, DMA_FROM_DEVICE);
+		dma_dst = dma_map_page(dev, page, ofs, count, DMA_FROM_DEVICE);
 	} else {
 		/* DMA routine */
 		dma_src = onenand->phys_base + (p - this->base);