netdev - RE: [Intel-wired-lan] [PATCH] igb: skip phy status check where unavailable

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Date:   Tue, 17 May 2022 04:51:06 +0000
From:   "G, GurucharanX" <gurucharanx.g@...el.com>
To:     Kevin Mitchell <kevmitch@...sta.com>
CC:     "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Takuma Ueba <t.ueba11@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: RE: [Intel-wired-lan] [PATCH] igb: skip phy status check where
 unavailable



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Kevin Mitchell
> Sent: Saturday, April 30, 2022 5:26 AM
> Cc: kevmitch@...sta.com; intel-wired-lan@...ts.osuosl.org; linux-
> kernel@...r.kernel.org; Takuma Ueba <t.ueba11@...il.com>; Jeff Kirsher
> <jeffrey.t.kirsher@...el.com>; netdev@...r.kernel.org; Jakub Kicinski
> <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; David S. Miller
> <davem@...emloft.net>
> Subject: [Intel-wired-lan] [PATCH] igb: skip phy status check where
> unavailable
> 
> igb_read_phy_reg() will silently return, leaving phy_data untouched, if
> hw->ops.read_reg isn't set. Depending on the uninitialized value of
> phy_data, this led to the phy status check either succeeding immediately or
> looping continuously for 2 seconds before emitting a noisy err-level timeout.
> This message went out to the console even though there was no actual
> problem.
> 
> Instead, first check if there is read_reg function pointer. If not, proceed
> without trying to check the phy status register.
> 
> Fixes: b72f3f72005d ("igb: When GbE link up, wait for Remote receiver status
> condition")
> Signed-off-by: Kevin Mitchell <kevmitch@...sta.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 

Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)