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

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Message-ID: <20201116172044.36bf1bad@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 16 Nov 2020 17:20:44 -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 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.