linux-kernel - Re: [PATCH v2 5/7] cxl/core: Use guard() to drop goto pattern of cxl_dpa

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Message-ID: <67b6859048d26_2d1e29482@dwillia2-xfh.jf.intel.com.notmuch>
Date: Wed, 19 Feb 2025 17:29:52 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: Li Ming <ming.li@...omail.com>, Dan Williams <dan.j.williams@...el.com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dave@...olabs.net>, <jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<ira.weiny@...el.com>
Subject: Re: [PATCH v2 5/7] cxl/core: Use guard() to drop goto pattern of
 cxl_dpa_alloc()

Li Ming wrote:
[..]
> After __cxl_dpa_alloc(), a 'devm_add_action_or_reset(&port->dev,
> cxl_dpa_release, cxled)' will be invoked, cxl_dpa_rwsem is possible to
> be held in cxl_dpa_release() in devm_add_action_or_reset() failure
> case.
> 
> So I create __cxl_dpa_alloc() to hold cxl_dpa_rwsem for the operations
> needed cxl_dpa_resem protection, make sure that the cxl_dpa_rwsem is
> released before devm_add_action_or_reset() invoking.

Ah, got it, missing context, makes sense.