netdev - Re: [PATCH net] net: renesas: rswitch: handle stop vs interrupt race

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Message-Id: 
 <173388723251.1105799.6013882460430110390.git-patchwork-notify@kernel.org>
Date: Wed, 11 Dec 2024 03:20:32 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Nikita Yushchenko <nikita.yoush@...entembedded.com>
Cc: yoshihiro.shimoda.uh@...esas.com, andrew@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 geert+renesas@...der.be, netdev@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
 michael.dege@...esas.com, christian.mardmoeller@...esas.com,
 dennis.ostermann@...esas.com
Subject: Re: [PATCH net] net: renesas: rswitch: handle stop vs interrupt race

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Mon,  9 Dec 2024 16:32:04 +0500 you wrote:
> Currently the stop routine of rswitch driver does not immediately
> prevent hardware from continuing to update descriptors and requesting
> interrupts.
> 
> It can happen that when rswitch_stop() executes the masking of
> interrupts from the queues of the port being closed, napi poll for
> that port is already scheduled or running on a different CPU. When
> execution of this napi poll completes, it will unmask the interrupts.
> And unmasked interrupt can fire after rswitch_stop() returns from
> napi_disable() call. Then, the handler won't mask it, because
> napi_schedule_prep() will return false, and interrupt storm will
> happen.
> 
> [...]

Here is the summary with links:
  - [net] net: renesas: rswitch: handle stop vs interrupt race
    https://git.kernel.org/netdev/net/c/3dd002f20098

You are awesome, thank you!
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