mtd: spi_nor: pass DMA-able buffer to spi_nor_read_raw()

 * @nor:	pointer to a 'struct spi_nor'

 * @addr:	offset in the serial flash memory

 * @len:	number of bytes to read

 * @buf:	buffer where the data is copied into

 * @buf:	buffer where the data is copied into (dma-safe memory)

 *

 * Return: 0 on success, -errno otherwise.

 */

					 u8 smpt_len)

{

	const u32 *ret;

	u8 *buf;

	u32 addr;

	int err;

	u8 i;

	u8 addr_width, read_opcode, read_dummy;

	u8 read_data_mask, data_byte, map_id;

	u8 read_data_mask, map_id;

	/* Use a kmalloc'ed bounce buffer to guarantee it is DMA-able. */

	buf = kmalloc(sizeof(*buf), GFP_KERNEL);

	if (!buf)

		return ERR_PTR(-ENOMEM);

	addr_width = nor->addr_width;

	read_dummy = nor->read_dummy;

		nor->read_opcode = SMPT_CMD_OPCODE(smpt[i]);

		addr = smpt[i + 1];

		err = spi_nor_read_raw(nor, addr, 1, &data_byte);

		err = spi_nor_read_raw(nor, addr, 1, buf);

		if (err) {

			ret = ERR_PTR(err);

			goto out;

		 * Build an index value that is used to select the Sector Map

		 * Configuration that is currently in use.

		 */

		map_id = map_id << 1 | !!(data_byte & read_data_mask);

		map_id = map_id << 1 | !!(*buf & read_data_mask);

	}

	/*

	/* fall through */

out:

	kfree(buf);

	nor->addr_width = addr_width;

	nor->read_dummy = read_dummy;

	nor->read_opcode = read_opcode;