linux-kernel - [RFC 1/9] of: provide a cleanup helper for OF nodes

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Date: Thu,  1 Feb 2024 16:55:24 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Alex Elder <elder@...aro.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Abel Vesa <abel.vesa@...aro.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Lukas Wunner <lukas@...ner.de>
Cc: linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-bluetooth@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [RFC 1/9] of: provide a cleanup helper for OF nodes

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Allow to use __free() to automatically put references to OF nodes.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 include/linux/of.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index 331e05918f11..5462ed47f25b 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -11,6 +11,8 @@
  * Updates for SPARC64 by David S. Miller
  * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
  */
+
+#include <linux/cleanup.h>
 #include <linux/types.h>
 #include <linux/bitops.h>
 #include <linux/errno.h>
@@ -887,6 +889,8 @@ static inline const void *of_device_get_match_data(const struct device *dev)
 #define of_match_node(_matches, _node)	NULL
 #endif /* CONFIG_OF */
 
+DEFINE_FREE(of_node, struct device_node *, if (_T) of_node_put(_T))
+
 /* Default string compare functions, Allow arch asm/prom.h to override */
 #if !defined(of_compat_cmp)
 #define of_compat_cmp(s1, s2, l)	strcasecmp((s1), (s2))
-- 
2.40.1