netdev - Re: [PATCH v2] net: ftgmac100: Fix crash when removing driver

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Date:   Mon, 16 Nov 2020 17:21:25 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Joel Stanley <joel@....id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "David S . Miller" <davem@...emloft.net>,
        Andrew Jeffery <andrew@...id.au>,
        Ivan Mikhaylov <i.mikhaylov@...ro.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: ftgmac100: Fix crash when removing driver

On Mon, 16 Nov 2020 17:20:44 -0800 Jakub Kicinski wrote:
> On Mon, 16 Nov 2020 13:57:15 +1030 Joel Stanley wrote:
> > When removing the driver we would hit BUG_ON(!list_empty(&dev->ptype_specific))
> > in net/core/dev.c due to still having the NC-SI packet handler
> > registered.
> > 
> >  # echo 1e660000.ethernet > /sys/bus/platform/drivers/ftgmac100/unbind
> >   ------------[ cut here ]------------
> >   kernel BUG at net/core/dev.c:10254!
> >   Internal error: Oops - BUG: 0 [#1] SMP ARM
> >   CPU: 0 PID: 115 Comm: sh Not tainted 5.10.0-rc3-next-20201111-00007-g02e0365710c4 #46
> >   Hardware name: Generic DT based system
> >   PC is at netdev_run_todo+0x314/0x394
> >   LR is at cpumask_next+0x20/0x24
> >   pc : [<806f5830>]    lr : [<80863cb0>]    psr: 80000153
> >   sp : 855bbd58  ip : 00000001  fp : 855bbdac
> >   r10: 80c03d00  r9 : 80c06228  r8 : 81158c54
> >   r7 : 00000000  r6 : 80c05dec  r5 : 80c05d18  r4 : 813b9280
> >   r3 : 813b9054  r2 : 8122c470  r1 : 00000002  r0 : 00000002
> >   Flags: Nzcv  IRQs on  FIQs off  Mode SVC_32  ISA ARM  Segment none
> >   Control: 00c5387d  Table: 85514008  DAC: 00000051
> >   Process sh (pid: 115, stack limit = 0x7cb5703d)
> >  ...
> >   Backtrace:
> >   [<806f551c>] (netdev_run_todo) from [<80707eec>] (rtnl_unlock+0x18/0x1c)
> >    r10:00000051 r9:854ed710 r8:81158c54 r7:80c76bb0 r6:81158c10 r5:8115b410
> >    r4:813b9000
> >   [<80707ed4>] (rtnl_unlock) from [<806f5db8>] (unregister_netdev+0x2c/0x30)
> >   [<806f5d8c>] (unregister_netdev) from [<805a8180>] (ftgmac100_remove+0x20/0xa8)
> >    r5:8115b410 r4:813b9000
> >   [<805a8160>] (ftgmac100_remove) from [<805355e4>] (platform_drv_remove+0x34/0x4c)
> > 
> > Fixes: bd466c3fb5a4 ("net/faraday: Support NCSI mode")
> > Signed-off-by: Joel Stanley <joel@....id.au>  
> 
> > diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
> > index 983b6db2d80d..88bfe2107938 100644
> > --- a/drivers/net/ethernet/faraday/ftgmac100.c
> > +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> > @@ -1926,6 +1926,8 @@ static int ftgmac100_probe(struct platform_device *pdev)
> >  err_phy_connect:
> >  	ftgmac100_phy_disconnect(netdev);  
> 
> This line does not exist in net, only in net-next, please respin on top
> of net so we can apply this to Linux 5.10 and backport to older stable
> releases.

Ah, and when you respin please put [PATCH net v3] in the subject so
that bots know which tree to test against.