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Date: Fri, 14 Jun 2019 18:54:10 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-kernel@...r.kernel.org
Cc: gregkh@...uxfoundation.org, rafael@...nel.org,
suzuki.poulose@....com, Heiko Carstens <heiko.carstens@...ibm.com>,
Harald Freudenberger <freude@...ux.ibm.com>,
Tomas Winkler <tomas.winkler@...el.com>,
Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v2 15/28] drivers: Introduce class_find_device_by_devt() helper
Add a wrapper to class_find_device() to search for a device
by the device type, reusing the generic match function. Also
convert the existing users.
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Harald Freudenberger <freude@...ux.ibm.com>
Cc: Tomas Winkler <tomas.winkler@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Acked-by: Harald Freudenberger <freude@...ux.ibm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
drivers/base/core.c | 9 +--------
drivers/misc/mei/main.c | 9 +--------
drivers/s390/crypto/zcrypt_api.c | 11 +----------
drivers/tty/tty_io.c | 8 +-------
include/linux/device.h | 12 ++++++++++++
5 files changed, 16 insertions(+), 33 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 053ee2e..e9746cf 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2839,13 +2839,6 @@ struct device *device_create_with_groups(struct class *class,
}
EXPORT_SYMBOL_GPL(device_create_with_groups);
-static int __match_devt(struct device *dev, const void *data)
-{
- const dev_t *devt = data;
-
- return dev->devt == *devt;
-}
-
/**
* device_destroy - removes a device that was created with device_create()
* @class: pointer to the struct class that this device was registered with
@@ -2858,7 +2851,7 @@ void device_destroy(struct class *class, dev_t devt)
{
struct device *dev;
- dev = class_find_device(class, NULL, &devt, __match_devt);
+ dev = class_find_device_by_devt(class, devt);
if (dev) {
put_device(dev);
device_unregister(dev);
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index ad02097..572502a 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -858,13 +858,6 @@ static ssize_t dev_state_show(struct device *device,
}
static DEVICE_ATTR_RO(dev_state);
-static int match_devt(struct device *dev, const void *data)
-{
- const dev_t *devt = data;
-
- return dev->devt == *devt;
-}
-
/**
* dev_set_devstate: set to new device state and notify sysfs file.
*
@@ -880,7 +873,7 @@ void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state)
dev->dev_state = state;
- clsdev = class_find_device(mei_class, NULL, &dev->cdev.dev, match_devt);
+ clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev);
if (clsdev) {
sysfs_notify(&clsdev->kobj, NULL, "dev_state");
put_device(clsdev);
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 38a5a47..150f623 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -133,12 +133,6 @@ struct zcdn_device {
static int zcdn_create(const char *name);
static int zcdn_destroy(const char *name);
-/* helper function, matches the devt value for find_zcdndev_by_devt() */
-static int __match_zcdn_devt(struct device *dev, const void *data)
-{
- return dev->devt == *((dev_t *) data);
-}
-
/*
* Find zcdn device by name.
* Returns reference to the zcdn device which needs to be released
@@ -158,10 +152,7 @@ static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
*/
static inline struct zcdn_device *find_zcdndev_by_devt(dev_t devt)
{
- struct device *dev =
- class_find_device(zcrypt_class, NULL,
- (void *) &devt,
- __match_zcdn_devt);
+ struct device *dev = class_find_device_by_devt(zcrypt_class, devt);
return dev ? to_zcdn_dev(dev) : NULL;
}
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 033ac7e..202f640 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2950,17 +2950,11 @@ void do_SAK(struct tty_struct *tty)
EXPORT_SYMBOL(do_SAK);
-static int dev_match_devt(struct device *dev, const void *data)
-{
- const dev_t *devt = data;
- return dev->devt == *devt;
-}
-
/* Must put_device() after it's unused! */
static struct device *tty_get_device(struct tty_struct *tty)
{
dev_t devt = tty_devnum(tty);
- return class_find_device(tty_class, NULL, &devt, dev_match_devt);
+ return class_find_device_by_devt(tty_class, devt);
}
diff --git a/include/linux/device.h b/include/linux/device.h
index 52ac911..2effcc2 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -522,6 +522,18 @@ class_find_device_by_fwnode(struct class *class,
return class_find_device(class, NULL, fwnode, device_match_fwnode);
}
+/**
+ * class_find_device_by_devt : device iterator for locating a particular device
+ * matching the device type.
+ * @class: class type
+ * @devt: device type of the device to match.
+ */
+static inline struct device *class_find_device_by_devt(struct class *class,
+ dev_t devt)
+{
+ return class_find_device(class, NULL, &devt, device_match_devt);
+}
+
struct class_attribute {
struct attribute attr;
ssize_t (*show)(struct class *class, struct class_attribute *attr,
--
2.7.4
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