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

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Message-ID: <20250916171702.GO12516@e132581.arm.com>
Date: Tue, 16 Sep 2025 18:17:02 +0100
From: Leo Yan <leo.yan@....com>
To: Sean Anderson <sean.anderson@...ux.dev>
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 Tue, Sep 16, 2025 at 12:51:11PM -0400, Sean Anderson wrote:
> 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.

I am fine for adding the notifier block in csdev.

Suzuki, could you confirm if this is the right way to move forward?

Thanks,
Leo