linux-kernel - Re: [PATCH v3] coresight: Fix possible deadlock in coresight_panic

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Message-ID: <42f1c98c-1432-47bb-9203-e878f011ff6e@linux.dev>
Date: Tue, 16 Sep 2025 12:51:11 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Leo Yan <leo.yan@....com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>, coresight@...ts.linaro.org,
 linux-arm-kernel@...ts.infradead.org, Yeoreum Yun <yeoreum.yun@....com>,
 Mike Leach <mike.leach@...aro.org>, Linu Cherian <lcherian@...vell.com>,
 linux-kernel@...r.kernel.org,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 James Clark <james.clark@...aro.org>
Subject: Re: [PATCH v3] coresight: Fix possible deadlock in coresight_panic_cb

On 9/16/25 12:48, Leo Yan wrote:
> On Tue, Sep 16, 2025 at 12:14:40PM -0400, Sean Anderson wrote:
> 
> [...]
> 
>> > Could you check if the drafted patch below looks good to you? If so, I
>> 
>> As stated above I disagree with a half-hearted removal. If you want to do that,
>> then I will resend v2 done with an rcu list and you can make your own follow-up.
> 
> It is fine to disagree, but please don't resend v2 :)
> 
> We have plan to refactor locking in CoreSight driver, I will try my
> best to avoid adding new lock unless with a strong reason.

As said above it will be done with an rcu list, so no new lock.

Or I can do this patch but stick the notifier block in csdev as suggested by Suzuki.

--Sean