mtd: spi-nor: update ptr pointer after spi_nor_read_data

In spi_nor_spimem_xfer_data, it will limit the transfer size
according to nor->bouncebuf_size which is usually equal to
PAGE_SIZE. This means that sometimes a spi_nor_read operation
will be split into several spi_nor_read_data operations if
the transfer size is bigger than PAGE_SIZE .

Considering the case above, when is_ofst_odd is 0, we initialize
the "ptr" to be the "buf" and pass "ptr" as the argument to
spi_nor_read_data, the "ptr" should be updated as the "buf"
after spi_nor_read_data is called, or else the receive data
will be stored in the same place every time.

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
State: pending

drivers/mtd/spi-nor/core.c

@@ -2192,6 +2192,8 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
 			*retlen += ret;
 		}
 		buf += ret;
+		if (!is_ofst_odd)
+			ptr += ret;
 		from += ret;
 		len -= ret;
 	}