diff --git a/drivers/input/ft5x06.c b/drivers/input/ft5x06.c
index 8afe629ae00..0502a3e3df3 100644
--- a/drivers/input/ft5x06.c
+++ b/drivers/input/ft5x06.c
@@ -1177,7 +1177,7 @@ int ft5x06_register(FAR struct i2c_master_s *i2c,
   priv = (FAR struct ft5x06_dev_s *)kmm_zalloc(sizeof(struct ft5x06_dev_s));
   if (!priv)
     {
-      ierr("ERROR: kmm_malloc(%d) failed\n", sizeof(struct ft5x06_dev_s));
+      ierr("ERROR: kmm_zalloc(%d) failed\n", sizeof(struct ft5x06_dev_s));
       return -ENOMEM;
     }
 
diff --git a/drivers/sensors/apds9960.c b/drivers/sensors/apds9960.c
index 9eb10b82299..f7c195c8f78 100644
--- a/drivers/sensors/apds9960.c
+++ b/drivers/sensors/apds9960.c
@@ -1251,7 +1251,7 @@ int apds9960_register(FAR const char *devpath,
   /* Initialize the APDS9960 device structure */
 
   FAR struct apds9960_dev_s *priv =
-    (FAR struct apds9960_dev_s *)kmm_malloc(sizeof(struct apds9960_dev_s));
+    (FAR struct apds9960_dev_s *)kmm_zalloc(sizeof(struct apds9960_dev_s));
 
   if (priv == NULL)
     {
@@ -1260,7 +1260,6 @@ int apds9960_register(FAR const char *devpath,
     }
 
   priv->config         = config;
-  priv->work.worker    = NULL;
   priv->gesture_motion = DIR_NONE;
   nxsem_init(&priv->sample_sem, 0, 0);
 
diff --git a/drivers/wireless/nrf24l01.c b/drivers/wireless/nrf24l01.c
index 06da78d77a4..1c42778f906 100644
--- a/drivers/wireless/nrf24l01.c
+++ b/drivers/wireless/nrf24l01.c
@@ -1460,7 +1460,7 @@ int nrf24l01_register(FAR struct spi_dev_s *spi,
 
   DEBUGASSERT((spi != NULL) & (cfg != NULL));
 
-  if ((dev = kmm_malloc(sizeof(struct nrf24l01_dev_s))) == NULL)
+  if ((dev = kmm_zalloc(sizeof(struct nrf24l01_dev_s))) == NULL)
     {
       return -ENOMEM;
     }
@@ -1469,16 +1469,9 @@ int nrf24l01_register(FAR struct spi_dev_s *spi,
   dev->config     = cfg;
 
   dev->state      = ST_UNKNOWN;
-  dev->en_aa      = 0;
   dev->ce_enabled = false;
 
   nxsem_init(&(dev->devsem), 0, 1);
-  dev->nopens     = 0;
-
-#ifndef CONFIG_DISABLE_POLL
-  dev->pfd        = NULL;
-#endif
-
   nxsem_init(&dev->sem_tx, 0, 0);
   nxsem_setprotocol(&dev->sem_tx, SEM_PRIO_NONE);
 
@@ -1490,10 +1483,6 @@ int nrf24l01_register(FAR struct spi_dev_s *spi,
     }
 
   dev->rx_fifo         = rx_fifo;
-  dev->nxt_read        = 0;
-  dev->nxt_write       = 0;
-  dev->fifo_len        = 0;
-  dev->irq_work.worker = 0;
 
   nxsem_init(&(dev->sem_fifo), 0, 1);
   nxsem_init(&(dev->sem_rx), 0, 0);