linux-kernel - Re: [PATCH v4 05/10] coresight: Appropriately disable trace bus clocks

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Message-ID: <807d7899-cab4-4449-aba4-645593b1db21@arm.com>
Date: Mon, 21 Jul 2025 10:20:42 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Leo Yan <leo.yan@....com>, Mike Leach <mike.leach@...aro.org>,
 James Clark <james.clark@...aro.org>,
 Anshuman Khandual <anshuman.khandual@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/10] coresight: Appropriately disable trace bus
 clocks

On 27/06/2025 12:51, Leo Yan wrote:
> Some CoreSight components have trace bus clocks 'atclk' and are enabled
> using clk_prepare_enable().  These clocks are not disabled when modules
> exit.
> 
> As atclk is optional, use devm_clk_get_optional_enabled() to manage it.
> The benefit is the driver model layer can automatically disable and
> release clocks.
> 
> Check the returned value with IS_ERR() to detect errors but leave the
> NULL pointer case if the clock is not found.  And remove the error
> handling codes which are no longer needed.
> 
> Fixes: d1839e687773 ("coresight: etm: retrieve and handle atclk")

I would drop this tag as I don't see what we are fixing ?
If there is indeed something, I would recommend:
  - Call it out in the commit description.
  - Move that as a separate patch, so that it can be
    safely backported without touching all the other drivers.

If you agree with the above, I will drop the "Fixes" tag and
can merge it.

Suzuki