linux-kernel - [RFC PATCH 09/12] drivers: base: reintroduce find

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Date:   Mon,  8 Feb 2021 23:22:00 +0100
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     linux-kernel@...r.kernel.org
Cc:     rafael@...nel.org, info@...ux.net, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, robh+dt@...nel.org,
        frowand.list@...il.com, pantelis.antoniou@...sulko.com,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Subject: [RFC PATCH 09/12] drivers: base: reintroduce find_bus()

---
 drivers/base/bus.c         | 14 ++++++++++----
 include/linux/device/bus.h |  2 ++
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 450d3ed6cf1f..a06ae2786092 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -754,13 +754,19 @@ EXPORT_SYMBOL_GPL(device_reprobe);
  *
  * Note that kset_find_obj increments bus' reference count.
  */
-#if 0
-struct bus_type *find_bus(char *name)
+struct bus_type *find_bus(const char *name)
 {
 	struct kobject *k = kset_find_obj(bus_kset, name);
-	return k ? to_bus(k) : NULL;
+	struct subsys_private *subsys_priv;
+
+	if (!k)
+		return NULL;
+
+	subsys_priv = container_of(to_kset(k), struct subsys_private, subsys);
+
+	return subsys_priv->bus;
 }
-#endif  /*  0  */
+EXPORT_SYMBOL_GPL(find_bus);
 
 static int bus_add_groups(struct bus_type *bus,
 			  const struct attribute_group **groups)
diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h
index 36a1dae26c95..b4cbcfe176c5 100644
--- a/include/linux/device/bus.h
+++ b/include/linux/device/bus.h
@@ -254,6 +254,8 @@ void bus_sort_breadthfirst(struct bus_type *bus,
 			   int (*compare)(const struct device *a,
 					  const struct device *b));
 
+struct bus_type *find_bus(const char *name);
+
 /**
  * bus_unregister_device_by_name - remove device by bus id from specific bus
  *                                 and unregister it from device core
-- 
2.11.0