linux-kernel - Re: [PATCH 1/6] cxl/mem: Fix devm_cxl_memdev_edac

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Message-ID: <adb50a0b-d00c-4c99-a169-127ad68e858a@amd.com>
Date: Thu, 4 Dec 2025 13:09:26 -0600
From: "Cheatham, Benjamin" <benjamin.cheatham@....com>
To: Dan Williams <dan.j.williams@...el.com>, <dave.jiang@...el.com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<Smita.KoralahalliChannabasappa@....com>, <alison.schofield@...el.com>,
	<terry.bowman@....com>, <alejandro.lucero-palau@....com>,
	<linux-pci@...r.kernel.org>, <Jonathan.Cameron@...wei.com>, Shiju Jose
	<shiju.jose@...wei.com>
Subject: Re: [PATCH 1/6] cxl/mem: Fix devm_cxl_memdev_edac_release() confusion

On 12/3/2025 8:21 PM, Dan Williams wrote:
> A device release method is only for undoing allocations on the path to
> preparing the device for device_add(). In contrast, devm allocations are
> post device_add(), are acquired during / after ->probe() and are released
> synchronous with ->remove().
> 
> So, a "devm" helper in a "release" method is a clear anti-pattern.
> 
> Move this devm release action where it belongs, an action created at edac
> object creation time. Otherwise, this leaks resources until
> cxl_memdev_release() time which may be long after these xarray and error
> record caches have gone idle.
> 
> Note, this also fixes up the type of @cxlmd->err_rec_array which needlessly
> dropped type-safety.
> 
> Fixes: 0b5ccb0de1e2 ("cxl/edac: Support for finding memory operation attributes from the current boot")
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Cc: Shiju Jose <shiju.jose@...wei.com>
> Cc: Alison Schofield <alison.schofield@...el.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---

Reviewed-by: Ben Cheatham <benjamin.cheatham@....com>