From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc: Daniel Scally <djrscally@gmail.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Bartosz Golaszewski <brgl@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Danilo Krummrich <dakr@kernel.org>,
Johan Hovold <johan@kernel.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
linux-acpi@vger.kernel.org, driver-core@lists.linux.dev,
linux-kernel@vger.kernel.org, imx@lists.linux.dev,
Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH 2/4] software node: use kobject_get_unless_zero() in software_node_find_by_name()
Date: Wed, 4 Nov 2026 23:29:25 +0200 [thread overview]
Message-ID: <auujtfVvejcsyums@ashevche-desk.local> (raw)
In-Reply-To: <20261104-swnode-race-v1-v1-2-9406a67e25be@nxp.com>
On Wed, Nov 04, 2026 at 11:43:14PM +0800, Peng Fan (OSS) wrote:
> software_node_find_by_name() also walks the swnode kset list and takes a
> reference with swnode_get(). Like the pointer-based lookup, it can
> encounter an entry whose refcount has already reached zero but which is
> still linked until its delayed release callback runs.
>
> Use kobject_get_unless_zero() and continue scanning when the entry is
> already dying.
...
> if (parent == swnode->node->parent && swnode->node->name &&
> !strcmp(name, swnode->node->name)) {
> - swnode_get(swnode);
> - break;
> + if (kobject_get_unless_zero(k))
> + break;
Can we rather see even in the previous patch something like
... swnode_get_alive(...)
{
...uses kobject_get_unless_zero()...
}
?
> }
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-11-04 21:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-04 15:43 [PATCH 0/4] software node: fix lookup of swnode in release path Peng Fan (OSS)
2026-11-04 15:43 ` [PATCH 1/4] software node: do not resurrect swnode being released Peng Fan (OSS)
2026-11-04 15:43 ` [PATCH 2/4] software node: use kobject_get_unless_zero() in software_node_find_by_name() Peng Fan (OSS)
2026-11-04 21:29 ` Andy Shevchenko [this message]
2026-11-04 15:43 ` [PATCH 3/4] software node: handle missing remote endpoint node Peng Fan (OSS)
2026-11-04 15:43 ` [PATCH 4/4] software node: skip dying children during traversal Peng Fan (OSS)
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