diff --git a/drivers/mtd/spi-nor/swp.c b/drivers/mtd/spi-nor/swp.c
index 8a75cd59cb10..229074d4e121 100644
--- a/drivers/mtd/spi-nor/swp.c
+++ b/drivers/mtd/spi-nor/swp.c
@@ -200,7 +200,8 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, u64 len)
 	u64 min_prot_len;
 	int ret;
 	u8 status_old[1] = {}, status_new[1] = {};
-	u8 bp_mask = spi_nor_get_sr_bp_mask(nor);
+	loff_t ofs_old, ofs_new;
+	u64 len_old, len_new;
 	loff_t lock_len;
 	bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
 	bool use_top;
@@ -248,10 +249,6 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, u64 len)
 	if (ret)
 		return ret;
 
-	/* Don't "lock" with no region! */
-	if (!(status_new[0] & bp_mask))
-		return -EINVAL;
-
 	/*
 	 * Disallow further writes if WP# pin is neither left floating nor
 	 * wrongly tied to GND (that includes internal pull-downs).
@@ -260,12 +257,20 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, u64 len)
 	if (!(nor->flags & SNOR_F_NO_WP))
 		status_new[0] |= SR_SRWD;
 
+	spi_nor_get_locked_range_sr(nor, status_old, &ofs_old, &len_old);
+	spi_nor_get_locked_range_sr(nor, status_new, &ofs_new, &len_new);
+
+	/* Don't "lock" with no region! */
+	if (!len_new)
+		return -EINVAL;
+
 	/* Don't bother if they're the same */
 	if (status_new[0] == status_old[0])
 		return 0;
 
 	/* Only modify protection if it will not unlock other areas */
-	if ((status_new[0] & bp_mask) < (status_old[0] & bp_mask))
+	if (len_old &&
+	    (ofs_old < ofs_new || (ofs_new + len_new) < (ofs_old + len_old)))
 		return -EINVAL;
 
 	return spi_nor_write_sr_and_check(nor, status_new[0]);
@@ -281,7 +286,8 @@ static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, u64 len)
 	u64 min_prot_len;
 	int ret;
 	u8 status_old[1], status_new[1];
-	u8 bp_mask = spi_nor_get_sr_bp_mask(nor);
+	loff_t ofs_old, ofs_new;
+	u64 len_old, len_new;
 	loff_t lock_len;
 	bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
 	bool use_top;
@@ -346,7 +352,10 @@ static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, u64 len)
 		return 0;
 
 	/* Only modify protection if it will not lock other areas */
-	if ((status_new[0] & bp_mask) > (status_old[0] & bp_mask))
+	spi_nor_get_locked_range_sr(nor, status_old, &ofs_old, &len_old);
+	spi_nor_get_locked_range_sr(nor, status_new, &ofs_new, &len_new);
+	if (len_old && len_new &&
+	    (ofs_new < ofs_old || (ofs_old + len_old) < (ofs_new + len_new)))
 		return -EINVAL;
 
 	return spi_nor_write_sr_and_check(nor, status_new[0]);