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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 <ben.dooks@codethink.co.uk>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Dooks 2014-03-21 12:09:14 +01:00 committed by David S. Miller
parent 801d233b73
commit b5893a0881
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/renesas/sh_eth.c
View File

@ -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;
}