From: Ira Weiny <ira.weiny@intel.com>
To: Sungwoo Kim <iam@sung-woo.kim>,
Davidlohr Bueso <dave@stgolabs.net>,
Jonathan Cameron <jonathan.cameron@huawei.com>,
Dave Jiang <dave.jiang@intel.com>,
Alison Schofield <alison.schofield@intel.com>,
"Vishal Verma" <vishal.l.verma@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
"Dan Williams" <dan.j.williams@intel.com>,
Ben Widawsky <bwidawsk@kernel.org>
Cc: <daveti@purdue.edu>, Sungwoo Kim <iam@sung-woo.kim>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
<linux-cxl@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] cxl/region: Fix a race bug in delete_region_store
Date: Mon, 9 Mar 2026 15:32:42 -0500 [thread overview]
Message-ID: <69af2e6a81cf6_1a62c11004c@iweiny-mobl.notmuch> (raw)
In-Reply-To: <20260308185958.2453707-2-iam@sung-woo.kim>
Sungwoo Kim wrote:
> A race exists when two concurrent sysfs writes to delete_region specify
> the same region name. Both calls succeed in cxl_find_region_by_name()
> (which only does device_find_child_by_name and takes a reference), and
> both then proceed to call devm_release_action(). The first call atomically
> removes and releases the devres entry successfully. The second call finds
> no matching entry, causing devres_release() to return -ENOENT, which trips
> the WARN_ON.
>
> Fix this by replacing devm_release_action() with devm_remove_action_nowarn()
> followed by a manual call to unregister_region(). devm_remove_action_nowarn()
> removes the devres tracking entry and returns an error code.
>
[snip]
>
> Fixes: 779dd20cfb56 ("cxl/region: Add region creation support")
> Signed-off-by: Sungwoo Kim <iam@sung-woo.kim>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
[snip]
next prev parent reply other threads:[~2026-03-09 20:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-08 18:59 Sungwoo Kim
2026-03-09 12:00 ` Jonathan Cameron
2026-03-09 17:56 ` Sungwoo Kim
2026-03-09 18:10 ` Jonathan Cameron
2026-03-09 20:32 ` Ira Weiny [this message]
2026-03-10 18:36 ` Davidlohr Bueso
2026-03-10 22:53 ` Dan Williams
2026-03-11 6:55 ` Sungwoo Kim
2026-04-01 3:50 ` Dan Williams
2026-04-02 19:11 ` Sungwoo Kim
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