Re: [E1000-devel] [PATCH RESEND 3/3] e1000e: fix accessing to suspended device

["Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@intel.com>]

On 2/24/2013 9:19 PM, Konstantin Khlebnikov wrote:
> This patch fixes some annoying messages like 'Error reading PHY register' and
> 'Hardware Erorr' and saves several seconds on reboot.

Any networking-related patches should also include netdev@vger.kernel.org.

I'm also a bit confused how the changes below match the patch 
description.  Elaborating a bit more how the changes suppress the 
messages might be a good thing.

>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Cc: e1000-devel@lists.sourceforge.net
> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> Cc: Bruce Allan <bruce.w.allan@intel.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ethtool.c |   13 +++++++++++++
>   drivers/net/ethernet/intel/e1000e/netdev.c  |    2 ++
>   2 files changed, 15 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 2c18137..f91a8f3 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -36,6 +36,7 @@
>   #include <linux/delay.h>
>   #include <linux/vmalloc.h>
>   #include <linux/mdio.h>
> +#include <linux/pm_runtime.h>
>
>   #include "e1000.h"
>
> @@ -2229,7 +2230,19 @@ static int e1000e_get_ts_info(struct net_device *netdev,
>   	return 0;
>   }
>
> +static int e1000e_ethtool_begin(struct net_device *netdev)
> +{
> +	return pm_runtime_get_sync(netdev->dev.parent);
> +}
> +
> +static void e1000e_ethtool_complete(struct net_device *netdev)
> +{
> +	pm_runtime_put_sync(netdev->dev.parent);
> +}
> +
>   static const struct ethtool_ops e1000_ethtool_ops = {
> +	.begin			= e1000e_ethtool_begin,
> +	.complete		= e1000e_ethtool_complete,
>   	.get_settings		= e1000_get_settings,
>   	.set_settings		= e1000_set_settings,
>   	.get_drvinfo		= e1000_get_drvinfo,

What do the ethtool additions have to do with this patch?  The patch 
description really doesn't seem to cover why these are here.

> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
> index 2954cc7..948b86ff 100644
> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
> @@ -4663,6 +4663,7 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
>   	    (adapter->hw.phy.media_type == e1000_media_type_copper)) {
>   		int ret_val;
>
> +		pm_runtime_get_sync(&adapter->pdev->dev);
>   		ret_val = e1e_rphy(hw, MII_BMCR, &phy->bmcr);
>   		ret_val |= e1e_rphy(hw, MII_BMSR, &phy->bmsr);
>   		ret_val |= e1e_rphy(hw, MII_ADVERTISE, &phy->advertise);
> @@ -4673,6 +4674,7 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
>   		ret_val |= e1e_rphy(hw, MII_ESTATUS, &phy->estatus);
>   		if (ret_val)
>   			e_warn("Error reading PHY register\n");
> +		pm_runtime_put_sync(&adapter->pdev->dev);
>   	} else {
>   		/* Do not read PHY registers if link is not up
>   		 * Set values to typical power-on defaults
>
>
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