target/linux/bcm4908/patches-5.10/078-v6.1-0001-net-broadcom-bcm4908_enet-handle-EPROBE_DEFER-when-g.patch

   1 From e93a766da57fff3273bcb618edf5dfca1fb86b89 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Thu, 15 Sep 2022 15:30:13 +0200
   4 Subject: [PATCH] net: broadcom: bcm4908_enet: handle -EPROBE_DEFER when
   5  getting MAC
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Reading MAC from OF may return -EPROBE_DEFER if underlaying NVMEM device
  11 isn't ready yet. In such case pass that error code up and "wait" to be
  12 probed later.
  13
  14 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  15 Link: https://lore.kernel.org/r/20220915133013.2243-1-zajec5@gmail.com
  16 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  17 ---
  18  drivers/net/ethernet/broadcom/bcm4908_enet.c | 13 +++++++++----
  19  1 file changed, 9 insertions(+), 4 deletions(-)
  20
  21 --- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
  22 +++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
  23 @@ -712,7 +712,9 @@ static int bcm4908_enet_probe(struct pla
  24                 return err;
  25
  26         SET_NETDEV_DEV(netdev, &pdev->dev);
  27 -       of_get_mac_address(dev->of_node, netdev->dev_addr);
  28 +       err = of_get_mac_address(dev->of_node, netdev->dev_addr);
  29 +       if (err == -EPROBE_DEFER)
  30 +               goto err_dma_free;
  31         if (!is_valid_ether_addr(netdev->dev_addr))
  32                 eth_hw_addr_random(netdev);
  33         netdev->netdev_ops = &bcm4908_enet_netdev_ops;
  34 @@ -723,14 +725,17 @@ static int bcm4908_enet_probe(struct pla
  35         netif_napi_add(netdev, &enet->rx_ring.napi, bcm4908_enet_poll_rx, NAPI_POLL_WEIGHT);
  36
  37         err = register_netdev(netdev);
  38 -       if (err) {
  39 -               bcm4908_enet_dma_free(enet);
  40 -               return err;
  41 -       }
  42 +       if (err)
  43 +               goto err_dma_free;
  44
  45         platform_set_drvdata(pdev, enet);
  46
  47         return 0;
  48 +
  49 +err_dma_free:
  50 +       bcm4908_enet_dma_free(enet);
  51 +
  52 +       return err;
  53  }
  54
  55  static int bcm4908_enet_remove(struct platform_device *pdev)