From b5893a08812602de164fa5ac6494f84df8d09a4f Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Fri, 21 Mar 2014 12:09:14 +0100 Subject: [PATCH] sh_eth: ensure pm_runtime cannot suspend the device during init The pm_rumtime work queue is causing the device to be suspended during initialisation, thus the initialisation may not be able to access registers properly. As the code is called from a work queue, it is possible that this is not seen from certain configurations/builds due to the asynchronos nature of the code. Another issue has also been found where the network device registration calls back into the driver thus causing further pm_runtime calls that also caused issues with the MDIO bus code. This has now been checked and is the only place the MDIO can be called without the device open. Use pm_runtime_get_sync() and pm_runtime_put() to ensure that the pm system does not suspend it during the probe() call and remove the now unnecessary pm_runtime_resume() call. Also add a call in the error path to call pm_runtime_disable(). This fixes the external abort that can cause /sbin/init or other such init processed to die. Signed-off-by: Ben Dooks Tested-by: Geert Uytterhoeven Acked-by: Laurent Pinchart Signed-off-by: David S. Miller --- drivers/net/ethernet/renesas/sh_eth.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c index e4bff181c910..6a9509ccd33b 100644 --- a/drivers/net/ethernet/renesas/sh_eth.c +++ b/drivers/net/ethernet/renesas/sh_eth.c @@ -2772,6 +2772,9 @@ static int sh_eth_drv_probe(struct platform_device *pdev) if (!ndev) return -ENOMEM; + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + /* The sh Ether-specific entries in the device structure. */ ndev->base_addr = res->start; devno = pdev->id; @@ -2799,8 +2802,6 @@ static int sh_eth_drv_probe(struct platform_device *pdev) spin_lock_init(&mdp->lock); mdp->pdev = pdev; - pm_runtime_enable(&pdev->dev); - pm_runtime_resume(&pdev->dev); if (pdev->dev.of_node) pd = sh_eth_parse_dt(&pdev->dev); @@ -2898,6 +2899,7 @@ static int sh_eth_drv_probe(struct platform_device *pdev) netdev_info(ndev, "Base address at 0x%x, %pM, IRQ %d.\n", (u32)ndev->base_addr, ndev->dev_addr, ndev->irq); + pm_runtime_put(&pdev->dev); platform_set_drvdata(pdev, ndev); return ret; @@ -2911,6 +2913,8 @@ out_release: if (ndev) free_netdev(ndev); + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); return ret; } -- 2.30.2