netdev - Re: [PATCH] net: usb: lan78xx: Use phy_mac_interrupt() for interrupt handling

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Date:   Wed, 23 Oct 2019 10:06:40 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        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

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);

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


Eventually, the rootfs can be loaded and the system boots. Though the
system is not really usable because it often stalls:


root@...ian:~# apt update
Ign:1 http://deb.debian.org/debian stretch InRelease
Hit:2 http://deb.debian.org/debian stretch Release
Reading package lists... 0% 


I don't see this with the irqdomain code reverted.