linux-kernel - Re: [PATCH v5 3/7] cxl/region: Skip decoder reset on detach for autodiscovered regions

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Message-ID: <20260122161858.00004b0c@huawei.com>
Date: Thu, 22 Jan 2026 16:18:58 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
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Subject: Re: [PATCH v5 3/7] cxl/region: Skip decoder reset on detach for
 autodiscovered regions

On Thu, 22 Jan 2026 04:55:39 +0000
Smita Koralahalli <Smita.KoralahalliChannabasappa@....com> wrote:

> __cxl_decoder_detach() currently resets decoder programming whenever a
> region is detached if cxl_config_state is beyond CXL_CONFIG_ACTIVE. For
> autodiscovered regions, this can incorrectly tear down decoder state
> that may be relied upon by other consumers or by subsequent ownership
> decisions.
> 
> Skip cxl_region_decode_reset() during detach when CXL_REGION_F_AUTO is
> set.
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
purely on basis we should probably not undo things we didn't do in the
first place.

J