[PATCH v2 2/4] drivers: net: cpsw: fix wrong regs access in cpsw_remove
From: Grygorii Strashko <grygorii.strashko@ti.com>
Date: 2016-07-28 17:51:08
Also in:
linux-omap, lkml
Subsystem:
networking drivers, the rest, ti ethernet switch driver (cpsw) · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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: Grygorii Strashko <grygorii.strashko@ti.com> --- drivers/net/ethernet/ti/cpsw.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 8f1eab9..ec6f473 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c@@ -2579,6 +2579,13 @@ 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));
@@ -2586,8 +2593,9 @@ 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);
--
2.9.2