Commit 8a0b6dc9 authored by Grygorii Strashko's avatar Grygorii Strashko Committed by David S. Miller

drivers: net: cpsw: fix wrong regs access in cpsw_remove

The L3 error will be generated and system will crash during unloading
of CPSW driver if CPSW is used as module and ethX devices are down.
This happens because CPSW can be power off by PM runtime now when ethX
devices are down.

Hence, ensure that CPSW powered up by PM runtime before performing any
deinitialization actions which require CPSW registers access. In case
of PM runtime error just leave cpsw_remove() as we can't do anything
anymore.
Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: default avatarMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fccd5bad
......@@ -2577,6 +2577,13 @@ static int cpsw_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct cpsw_priv *priv = netdev_priv(ndev);
int ret;
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0) {
pm_runtime_put_noidle(&pdev->dev);
return ret;
}
if (priv->data.dual_emac)
unregister_netdev(cpsw_get_slave_ndev(priv, 1));
......@@ -2584,8 +2591,9 @@ static int cpsw_remove(struct platform_device *pdev)
cpsw_ale_destroy(priv->ale);
cpdma_ctlr_destroy(priv->dma);
pm_runtime_disable(&pdev->dev);
device_for_each_child(&pdev->dev, NULL, cpsw_remove_child_device);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
if (priv->data.dual_emac)
free_netdev(cpsw_get_slave_ndev(priv, 1));
free_netdev(ndev);
......
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