linux-kernel - Re: [Intel-wired-lan] [PATCH] e1000e: Fix e1000_check_for_copper_link

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Message-ID: <441de43f-4234-7616-2879-7e2e31a8d522@intel.com>
Date:   Thu, 21 Dec 2017 08:57:17 +0200
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     Benjamin Poirier <bpoirier@...e.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Gabriel C <nix.or.die@...il.com>, netdev@...r.kernel.org,
        Christian Hesse <list@...rm.de>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org
Subject: Re: [Intel-wired-lan] [PATCH] e1000e: Fix
 e1000_check_for_copper_link_ich8lan return value.

On 11/12/2017 9:26, Benjamin Poirier wrote:
> e1000e_check_for_copper_link() and e1000_check_for_copper_link_ich8lan()
> are the two functions that may be assigned to mac.ops.check_for_link when
> phy.media_type == e1000_media_type_copper. Commit 19110cfbb34d ("e1000e:
> Separate signaling for link check/link up") changed the meaning of the
> return value of check_for_link for copper media but only adjusted the first
> function. This patch adjusts the second function likewise.
>
> Reported-by: Christian Hesse <list@...rm.de>
> Reported-by: Gabriel C <nix.or.die@...il.com>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=198047
> Fixes: 19110cfbb34d ("e1000e: Separate signaling for link check/link up")
> Tested-by: Christian Hesse <list@...rm.de>
> Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ich8lan.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> index d6d4ed7acf03..31277d3bb7dc 100644
> --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> @@ -1367,6 +1367,9 @@ static s32 e1000_disable_ulp_lpt_lp(struct e1000_hw *hw, bool force)
>    *  Checks to see of the link status of the hardware has changed.  If a
>    *  change in link status has been detected, then we read the PHY registers
>    *  to get the current speed/duplex if link exists.
> + *
> + *  Returns a negative error code (-E1000_ERR_*) or 0 (link down) or 1 (link
> + *  up).
>    **/
>   static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
>   {
> @@ -1382,7 +1385,7 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
>   	 * Change or Rx Sequence Error interrupt.
>   	 */
>   	if (!mac->get_link_status)
> -		return 0;
> +		return 1;
>   
>   	/* First we want to see if the MII Status Register reports
>   	 * link.  If so, then we want to get the current speed/duplex
> @@ -1613,10 +1616,12 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
>   	 * different link partner.
>   	 */
>   	ret_val = e1000e_config_fc_after_link_up(hw);
> -	if (ret_val)
> +	if (ret_val) {
>   		e_dbg("Error configuring flow control\n");
> +		return ret_val;
> +	}
>   
> -	return ret_val;
> +	return 1;
>   }
>   
>   static s32 e1000_get_variants_ich8lan(struct e1000_adapter *adapter)

Acked by sasha.neftin@...el.com