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net: macb: Add shutdown operation support

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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 <abin.joseph@amd.com>
Link: https://patch.msgid.link/20250610114111.1708614-1-abin.joseph@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Abin Joseph 2025-06-10 17:11:11 +05:30 committed by Jakub Kicinski
parent 48c15e974c
commit 5e84d5b36b
1 changed files with 15 additions and 0 deletions
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15
drivers/net/ethernet/cadence/macb_main.c
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@ -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);