linux-kernel - [PATCH v3 3/4] devres: No need to call remove

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Date:   Wed, 14 Apr 2021 19:25:10 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v3 3/4] devres: No need to call remove_nodes() when there none present

If a list of devres nodes is empty, no need to call remove_nodes().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v3: new patch
 drivers/base/devres.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index db1f3137fc81..dee48858663f 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -526,6 +526,10 @@ int devres_release_all(struct device *dev)
 	if (WARN_ON(dev->devres_head.next == NULL))
 		return -ENODEV;
 
+	/* Nothing to release if list is empty */
+	if (list_empty(&dev->devres_head))
+		return 0;
+
 	spin_lock_irqsave(&dev->devres_lock, flags);
 	cnt = remove_nodes(dev, dev->devres_head.next, &dev->devres_head, &todo);
 	spin_unlock_irqrestore(&dev->devres_lock, flags);
-- 
2.30.2