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From: Jonathan Cameron <jic23@kernel.org>
To: linux-iio@vger.kernel.org,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Len Brown <lenb@kernel.org>,
	linux-acpi@vger.kernel.org,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Daniel Scally <djrscally@gmail.com>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Julia Lawall <Julia.Lawall@inria.fr>
Cc: "Nuno Sá" <nuno.sa@analog.com>,
	"Cosmin Tanislav" <cosmin.tanislav@analog.com>,
	"Mihail Chindris" <mihail.chindris@analog.com>,
	"Rasmus Villemoes" <linux@rasmusvillemoes.dk>,
	"Tomislav Denis" <tomislav.denis@avl.com>,
	"Marek Vasut" <marex@denx.de>,
	"Olivier Moysan" <olivier.moysan@foss.st.com>,
	"Fabrice Gasnier" <fabrice.gasnier@foss.st.com>,
	"Lad Prabhakar" <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	"Dmitry Baryshkov" <dmitry.baryshkov@linaro.org>,
	"Marijn Suijten" <marijn.suijten@somainline.org>,
	"Marius Cristea" <marius.cristea@microchip.com>,
	"Ibrahim Tilki" <Ibrahim.Tilki@analog.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Jonathan Cameron" <Jonathan.Cameron@huawei.com>
Subject: [PATCH v4 04/15] device property: Introduce device_for_each_child_node_scoped()
Date: Sat, 17 Feb 2024 16:42:38 +0000	[thread overview]
Message-ID: <20240217164249.921878-5-jic23@kernel.org> (raw)
In-Reply-To: <20240217164249.921878-1-jic23@kernel.org>

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Similar to recently propose for_each_child_of_node_scoped() this
new version of the loop macro instantiates a new local
struct fwnode_handle * that uses the __free(fwnode_handle) auto
cleanup handling so that if a reference to a node is held on early
exit from the loop the reference will be released. If the loop
runs to completion, the child pointer will be NULL and no action will
be taken.

The reason this is useful is that it removes the need for
fwnode_handle_put() on early loop exits.  If there is a need
to retain the reference, then return_ptr(child) or no_free_ptr(child)
may be used to safely disable the auto cleanup.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
v4: Include the alignement changes that were in patch 15 of v3 with
    a tweak as I missed the first line. Thanks Andy!

 include/linux/property.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/property.h b/include/linux/property.h
index 9e67c3c4df6e..eefd662a2f9d 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -182,6 +182,11 @@ struct fwnode_handle *device_get_next_child_node(const struct device *dev,
 	for (child = device_get_next_child_node(dev, NULL); child;	\
 	     child = device_get_next_child_node(dev, child))
 
+#define device_for_each_child_node_scoped(dev, child)			\
+	for (struct fwnode_handle *child __free(fwnode_handle) =	\
+		device_get_next_child_node(dev, NULL);			\
+	     child; child = device_get_next_child_node(dev, child))
+
 struct fwnode_handle *fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
 						  const char *childname);
 struct fwnode_handle *device_get_named_child_node(const struct device *dev,
-- 
2.43.2


  parent reply	other threads:[~2024-02-17 16:43 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-17 16:42 [PATCH v4 00/15] device property / IIO: Use cleanup.h magic for fwnode_handle_put() handling Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 01/15] device property: Move fwnode_handle_put() into property.h Jonathan Cameron
2024-02-19  8:55   ` Greg Kroah-Hartman
2024-02-20  6:55   ` Sakari Ailus
2024-02-17 16:42 ` [PATCH v4 02/15] device property: Add cleanup.h based fwnode_handle_put() scope based cleanup Jonathan Cameron
2024-02-19  8:55   ` Greg Kroah-Hartman
2024-02-20  6:55   ` Sakari Ailus
2024-02-17 16:42 ` [PATCH v4 03/15] iio: temp: ltc2983: Use __free(fwnode_handle) to replace fwnode_handle_put() calls Jonathan Cameron
2024-02-19 13:52   ` Nuno Sá
2024-02-24 11:37     ` Jonathan Cameron
2024-02-17 16:42 ` Jonathan Cameron [this message]
2024-02-19  8:56   ` [PATCH v4 04/15] device property: Introduce device_for_each_child_node_scoped() Greg Kroah-Hartman
2024-02-20  6:59   ` Sakari Ailus
2024-02-17 16:42 ` [PATCH v4 05/15] iio: adc: max11410: Use device_for_each_child_node_scoped() Jonathan Cameron
2024-02-19 13:54   ` Nuno Sá
2024-02-17 16:42 ` [PATCH v4 06/15] iio: adc: mcp3564: " Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 07/15] iio: adc: qcom-spmi-adc5: " Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 08/15] iio: adc: rzg2l_adc: " Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 09/15] iio: adc: stm32: " Jonathan Cameron
2024-02-19 11:45   ` Andy Shevchenko
2024-02-24 12:16     ` Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 10/15] iio: adc: ti-ads1015: " Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 11/15] iio: adc: ti-ads131e08: " Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 12/15] iio: addac: ad74413r: " Jonathan Cameron
2024-02-19 13:55   ` Nuno Sá
2024-02-17 16:42 ` [PATCH v4 13/15] iio: dac: ad3552r: " Jonathan Cameron
2024-02-19 11:46   ` Andy Shevchenko
2024-02-17 16:42 ` [PATCH v4 14/15] iio: dac: ad5770r: " Jonathan Cameron
2024-02-17 16:42 ` [PATCH v4 15/15] iio: dac: ltc2688: " Jonathan Cameron
2024-02-19 11:48   ` Andy Shevchenko
2024-02-19 15:48     ` Jonathan Cameron
2024-02-19 13:49   ` Nuno Sá
2024-02-19 11:49 ` [PATCH v4 00/15] device property / IIO: Use cleanup.h magic for fwnode_handle_put() handling Andy Shevchenko
2024-02-19 15:49   ` Jonathan Cameron
2024-02-24 11:49     ` Jonathan Cameron
2024-02-28 14:15       ` Jonathan Cameron

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