lkml.org 
[lkml]   [2017]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH net-next v3 05/10] drivers: base: Add device_find_class()
Date
Add a helper function to lookup a device reference given a class name.
This is a preliminary patch to remove adhoc code from net/dsa/dsa.c and
make it more generic.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/base/core.c | 19 +++++++++++++++++++
include/linux/device.h | 1 +
2 files changed, 20 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 020ea7f05520..3dd6047c10d8 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2065,6 +2065,25 @@ struct device *device_find_child(struct device *parent, void *data,
}
EXPORT_SYMBOL_GPL(device_find_child);

+static int dev_is_class(struct device *dev, void *class)
+{
+ if (dev->class != NULL && !strcmp(dev->class->name, class))
+ return 1;
+
+ return 0;
+}
+
+struct device *device_find_class(struct device *parent, char *class)
+{
+ if (dev_is_class(parent, class)) {
+ get_device(parent);
+ return parent;
+ }
+
+ return device_find_child(parent, class, dev_is_class);
+}
+EXPORT_SYMBOL_GPL(device_find_class);
+
int __init devices_init(void)
{
devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
diff --git a/include/linux/device.h b/include/linux/device.h
index 491b4c0ca633..8d37f5ecb972 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1120,6 +1120,7 @@ extern int device_for_each_child_reverse(struct device *dev, void *data,
int (*fn)(struct device *dev, void *data));
extern struct device *device_find_child(struct device *dev, void *data,
int (*match)(struct device *dev, void *data));
+extern struct device *device_find_class(struct device *parent, char *class);
extern int device_rename(struct device *dev, const char *new_name);
extern int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order);
--
2.9.3
\
 
 \ /
  Last update: 2017-01-14 22:49    [W:0.265 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site