From 5e84d5b36b5b0e8552fbbdfbfd9c81bb79ab0947 Mon Sep 17 00:00:00 2001 From: Abin Joseph Date: Tue, 10 Jun 2025 17:11:11 +0530 Subject: [PATCH] net: macb: Add shutdown operation support Implement the shutdown hook to ensure clean and complete deactivation of MACB controller. The shutdown sequence is protected with 'rtnl_lock()' to serialize access and prevent race conditions while detaching and closing the network device. This ensure a safe transition when the Kexec utility calls the shutdown hook, facilitating seamless loading and booting of a new kernel from the currently running one. Signed-off-by: Abin Joseph Link: https://patch.msgid.link/20250610114111.1708614-1-abin.joseph@amd.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/cadence/macb_main.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index d1f1ae5ea161c..53aaf6b08e39a 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -5654,6 +5654,20 @@ static int __maybe_unused macb_runtime_resume(struct device *dev) return 0; } +static void macb_shutdown(struct platform_device *pdev) +{ + struct net_device *netdev = platform_get_drvdata(pdev); + + rtnl_lock(); + + if (netif_running(netdev)) + dev_close(netdev); + + netif_device_detach(netdev); + + rtnl_unlock(); +} + static const struct dev_pm_ops macb_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(macb_suspend, macb_resume) SET_RUNTIME_PM_OPS(macb_runtime_suspend, macb_runtime_resume, NULL) @@ -5667,6 +5681,7 @@ static struct platform_driver macb_driver = { .of_match_table = of_match_ptr(macb_dt_ids), .pm = &macb_pm_ops, }, + .shutdown = macb_shutdown, }; module_platform_driver(macb_driver); -- 2.47.2