linux-kernel - Re: [PATCH] net: usb: lan78xx: Use phy_mac

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Message-ID: <20191024104317.32bp32krrjmfb36p@linutronix.de>
Date:   Thu, 24 Oct 2019 12:43:17 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        Marc Zyngier <maz@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Stefan Wahren <wahrenst@....net>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] net: usb: lan78xx: Use phy_mac_interrupt() for interrupt
 handling

On 2019-10-23 10:06:40 [+0200], Daniel Wagner wrote:
> Sebastian suggested to try this here:
> 
> --- a/drivers/net/usb/lan78xx.c
> +++ b/drivers/net/usb/lan78xx.c
> @@ -1264,8 +1264,11 @@ static void lan78xx_status(struct lan78xx_net *dev, struct urb *urb)
>                 netif_dbg(dev, link, dev->net, "PHY INTR: 0x%08x\n", intdata);
>                 lan78xx_defer_kevent(dev, EVENT_LINK_RESET);
>  
> -               if (dev->domain_data.phyirq > 0)
> +               if (dev->domain_data.phyirq > 0) {
> +                       local_irq_disable();
>                         generic_handle_irq(dev->domain_data.phyirq);
> +                       local_irq_enable();
> +               }
>         } else
>                 netdev_warn(dev->net,
>                             "unexpected interrupt: 0x%08x\n", intdata);

This should should be applied as a regression fix introduced by commit
   ed194d1367698 ("usb: core: remove local_irq_save() around ->complete() handler")

> While this gets rid of the warning, the networking interface is not
> really stable:
> 
> [   43.999628] nfs: server 192.168.19.2 not responding, still trying
> [   43.999633] nfs: server 192.168.19.2 not responding, still trying
> [   43.999649] nfs: server 192.168.19.2 not responding, still trying
> [   43.999674] nfs: server 192.168.19.2 not responding, still trying
> [   43.999678] nfs: server 192.168.19.2 not responding, still trying
> [   44.006712] nfs: server 192.168.19.2 OK
> [   44.018443] nfs: server 192.168.19.2 OK
> [   44.024765] nfs: server 192.168.19.2 OK
> [   44.025361] nfs: server 192.168.19.2 OK
> [   44.025420] nfs: server 192.168.19.2 OK
> [  256.991659] nfs: server 192.168.19.2 not responding, still trying
> [  256.991664] nfs: server 192.168.19.2 not responding, still trying
> [  256.991669] nfs: server 192.168.19.2 not responding, still trying
> [  256.991685] nfs: server 192.168.19.2 not responding, still trying
> [  256.991713] nfs: server 192.168.19.2 not responding, still trying
> [  256.998797] nfs: server 192.168.19.2 OK
> [  256.999745] nfs: server 192.168.19.2 OK
> [  256.999828] nfs: server 192.168.19.2 OK
> [  257.000438] nfs: server 192.168.19.2 OK
> [  257.004784] nfs: server 192.168.19.2 OK

Since this does not improve the situation as a whole it might be best to
remove the code as suggested by Daniel.

Sebastian