linux-kernel - Re: [PATCH v2 net] net: dsa: microchip: Added the condition for scheduling ksz_mib_read

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Date:   Tue, 12 Oct 2021 10:40:07 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        george.mccollister@...il.com, kuba@...nel.org, davem@...emloft.net,
        olteanv@...il.com, f.fainelli@...il.com, vivien.didelot@...il.com,
        andrew@...n.ch, UNGLinuxDriver@...rochip.com,
        woojung.huh@...rochip.com
Subject: Re: [PATCH v2 net] net: dsa: microchip: Added the condition for
 scheduling ksz_mib_read_work

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Mon, 11 Oct 2021 21:18:08 +0530 you wrote:
> When the ksz module is installed and removed using rmmod, kernel crashes
> with null pointer dereferrence error. During rmmod, ksz_switch_remove
> function tries to cancel the mib_read_workqueue using
> cancel_delayed_work_sync routine and unregister switch from dsa.
> 
> During dsa_unregister_switch it calls ksz_mac_link_down, which in turn
> reschedules the workqueue since mib_interval is non-zero.
> Due to which queue executed after mib_interval and it tries to access
> dp->slave. But the slave is unregistered in the ksz_switch_remove
> function. Hence kernel crashes.
> 
> [...]

Here is the summary with links:
  - [v2,net] net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work
    https://git.kernel.org/netdev/net/c/ef1100ef20f2

You are awesome, thank you!
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