diff --git a/cpu/sam0_common/sam0_eth/eth-netdev.c b/cpu/sam0_common/sam0_eth/eth-netdev.c
index 3b1ce6166a..d61bb19e94 100644
--- a/cpu/sam0_common/sam0_eth/eth-netdev.c
+++ b/cpu/sam0_common/sam0_eth/eth-netdev.c
@@ -221,13 +221,13 @@ static int _sam0_eth_confirm_send(netdev_t *netdev, void *info)
         return -EAGAIN;
     }
 
-    /* Retry Limit Exceeded */
-    if (tsr & GMAC_TSR_RLE) {
+    /* Retry Limit Exceeded, Collision Occurred */
+    if (tsr & (GMAC_TSR_RLE | GMAC_TSR_COL)) {
         return -EBUSY;
     }
 
-    /* Transmit Frame Corruption, Collision Occurred */
-    if (tsr & (GMAC_TSR_TFC | GMAC_TSR_COL)) {
+    /* Transmit Frame Corruption */
+    if (tsr & GMAC_TSR_TFC) {
         return -EIO;
     }
 
diff --git a/drivers/include/net/netdev.h b/drivers/include/net/netdev.h
index 12266ffa64..53362e59bb 100644
--- a/drivers/include/net/netdev.h
+++ b/drivers/include/net/netdev.h
@@ -468,10 +468,12 @@ typedef struct netdev_driver {
      *          frame delimiters, etc. May be an estimate for performance
      *          reasons.)
      * @retval  -EAGAIN     Transmission still ongoing. (Call later again!)
-     * @retval  -ECOMM      Any kind of transmission error, such as collision
-     *                      detected, layer 2 ACK timeout, etc.
+     * @retval  -EHOSTUNREACH  Layer 2 ACK timeout
+     * @retval  -EBUSY      Medium is busy. (E.g. Auto-CCA failed / timed out,
+     *                      collision detected)
+     * @retval  -ENETDOWN   Interface is not connected / powered down
+     * @retval  -EIO        Any kind of transmission error
      *                      Use @p info for more details
-     * @retval  -EBUSY      Medium is busy. (E.g. Auto-CCA failed / timed out)
      * @retval  <0          Other error. (Please use a negative errno code.)
      *
      * @warning After netdev_driver_t::send was called and returned zero, this