mtd: spi-nor: Check all the bits written, not just the BP ones

Check that all the bits written in the write_sr_and_check() method
match the status_new received value. Failing to write the other bits
is dangerous too, extend the check.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: ambarus

drivers/mtd/spi-nor/spi-nor.c

@@ -960,8 +960,7 @@ static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)
 }
 
 /* Write status register and ensure bits in mask match written values */
-static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new,
-				      u8 mask)
+static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new)
 {
 	int ret;
 
@@ -975,7 +974,7 @@ static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new,
 	if (ret)
 		return ret;
 
-	return ((nor->bouncebuf[0] & mask) != (status_new & mask)) ? -EIO : 0;
+	return (nor->bouncebuf[0] != status_new) ? -EIO : 0;
 }
 
 /**
@@ -1774,7 +1773,7 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 	if ((status_new & mask) < (status_old & mask))
 		return -EINVAL;
 
-	return spi_nor_write_sr_and_check(nor, status_new, mask);
+	return spi_nor_write_sr_and_check(nor, status_new);
 }
 
 /*
@@ -1859,7 +1858,7 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 	if ((status_new & mask) > (status_old & mask))
 		return -EINVAL;
 
-	return spi_nor_write_sr_and_check(nor, status_new, mask);
+	return spi_nor_write_sr_and_check(nor, status_new);
 }
 
 /*