diff --git a/drivers/net/ethernet/sfc/efx_common.c b/drivers/net/ethernet/sfc/efx_common.c
index c2224e41a694d849076f43395f42362a74c9e0cd..cc30524c2fe45c9f49857ac6af7d5629166992e2 100644
--- a/drivers/net/ethernet/sfc/efx_common.c
+++ b/drivers/net/ethernet/sfc/efx_common.c
@@ -1164,7 +1164,7 @@ static ssize_t mcdi_logging_show(struct device *dev,
 	struct efx_nic *efx = dev_get_drvdata(dev);
 	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", mcdi->logging_enabled);
+	return sysfs_emit(buf, "%d\n", mcdi->logging_enabled);
 }
 
 static ssize_t mcdi_logging_store(struct device *dev,
diff --git a/drivers/net/ethernet/sfc/siena/efx_common.c b/drivers/net/ethernet/sfc/siena/efx_common.c
index 1fd396b00bfbb84a00e3a47d504911b800270605..e4b294b8e9acb15f68b6597047d493add699196f 100644
--- a/drivers/net/ethernet/sfc/siena/efx_common.c
+++ b/drivers/net/ethernet/sfc/siena/efx_common.c
@@ -1178,7 +1178,7 @@ static ssize_t mcdi_logging_show(struct device *dev,
 	struct efx_nic *efx = dev_get_drvdata(dev);
 	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 
-	return scnprintf(buf, PAGE_SIZE, "%d\n", mcdi->logging_enabled);
+	return sysfs_emit(buf, "%d\n", mcdi->logging_enabled);
 }
 
 static ssize_t mcdi_logging_store(struct device *dev,