diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index dcbe278086dc..6a5f40f11db3 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -207,6 +207,12 @@ static const enum gpiod_flags gpio_flags[] = {
  */
 #define SFP_PHY_ADDR	22
 
+/* SFP_EEPROM_BLOCK_SIZE is the size of data chunk to read the EEPROM
+ * at a time. Some SFP modules and also some Linux I2C drivers do not like
+ * reads longer than 16 bytes.
+ */
+#define SFP_EEPROM_BLOCK_SIZE	16
+
 struct sff_data {
 	unsigned int gpios;
 	bool (*module_supported)(const struct sfp_eeprom_id *id);
@@ -1754,11 +1760,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 	u8 check;
 	int ret;
 
-	/* Some SFP modules and also some Linux I2C drivers do not like reads
-	 * longer than 16 bytes, so read the EEPROM in chunks of 16 bytes at
-	 * a time.
-	 */
-	sfp->i2c_block_size = 16;
+	sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE;
 
 	ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
 	if (ret < 0) {
@@ -2385,6 +2387,7 @@ static struct sfp *sfp_alloc(struct device *dev)
 		return ERR_PTR(-ENOMEM);
 
 	sfp->dev = dev;
+	sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE;
 
 	mutex_init(&sfp->sm_mutex);
 	mutex_init(&sfp->st_mutex);