linux-kernel - Re: [PATCH] net: usb: asix: ax88772_bind return error when hw

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Date:   Thu, 24 Jan 2019 22:33:40 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     zhang.run@....com.cn
Cc:     marcel.ziswiler@...adex.com, lynxis@...0.eu,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, xue.zhihong@....com.cn,
        wang.yi59@....com.cn
Subject: Re: [PATCH] net: usb: asix: ax88772_bind return error when
 hw_reset fail

From: Zhang Run <zhang.run@....com.cn>
Date: Thu, 24 Jan 2019 13:48:49 +0800

> The ax88772_bind() should return error code immediately when the PHY
> was not reset properly through ax88772a_hw_reset().
> Otherwise, The asix_get_phyid() will block when get the PHY 
> Identifier from the PHYSID1 MII registers through asix_mdio_read() 
> due to the PHY isn't ready. Furthermore, it will produce a lot of 
> error message cause system crash.As follows:
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to write
>  reg index 0x0000: -71
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to send
>  software reset: ffffffb9
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to write
>  reg index 0x0000: -71
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to enable
>  software MII access
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to read
>  reg index 0x0000: -71
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to write
>  reg index 0x0000: -71
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to enable
>  software MII access
> asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to read
>  reg index 0x0000: -71
> ... 
> 
> Signed-off-by: Zhang Run <zhang.run@....com.cn>
> Reviewed-by: Yang Wei <yang.wei9@....com.cn>

Applied.