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SubjectRe: [PATCH v2 12/28] drivers: Introduce class_find_device_by_name() helper
On 14/06/2019 18:54:07+0100, Suzuki K Poulose wrote:
> Add a new wrapper for class_find_device() to search for devices
> by name and convert the existing users to use the new helper.
>
> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> Cc: Alessandro Zummo <a.zummo@towertech.it>
> Cc: Alexander Aring <alex.aring@gmail.com>
> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Cc: Dan Murphy <dmurphy@ti.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> Cc: linux-leds@vger.kernel.org
> Cc: linux-rtc@vger.kernel.org
> Cc: linux-usb@vger.kernel.org
> Cc: linux-wpan@vger.kernel.org
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Stefan Schmidt <stefan@datenfreihafen.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
> drivers/hwtracing/stm/core.c | 9 +--------
> drivers/leds/led-class.c | 9 +--------
> drivers/rtc/interface.c | 11 +----------
> drivers/s390/crypto/zcrypt_api.c | 11 +----------
> drivers/usb/roles/class.c | 8 +-------
> drivers/usb/typec/class.c | 8 +-------
> include/linux/device.h | 12 ++++++++++++
> net/ieee802154/core.c | 7 +------
> 8 files changed, 19 insertions(+), 56 deletions(-)
>
> diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
> index e55b902..2b6bd42 100644
> --- a/drivers/hwtracing/stm/core.c
> +++ b/drivers/hwtracing/stm/core.c
> @@ -89,13 +89,6 @@ static struct class stm_class = {
> .dev_groups = stm_groups,
> };
>
> -static int stm_dev_match(struct device *dev, const void *data)
> -{
> - const char *name = data;
> -
> - return sysfs_streq(name, dev_name(dev));
> -}
> -
> /**
> * stm_find_device() - find stm device by name
> * @buf: character buffer containing the name
> @@ -116,7 +109,7 @@ struct stm_device *stm_find_device(const char *buf)
> if (!stm_core_up)
> return NULL;
>
> - dev = class_find_device(&stm_class, NULL, buf, stm_dev_match);
> + dev = class_find_device_by_name(&stm_class, buf);
> if (!dev)
> return NULL;
>
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 85848c5..317a619 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -216,13 +216,6 @@ static int led_resume(struct device *dev)
>
> static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
>
> -static int match_name(struct device *dev, const void *data)
> -{
> - if (!dev_name(dev))
> - return 0;
> - return !strcmp(dev_name(dev), (char *)data);
> -}
> -
> static int led_classdev_next_name(const char *init_name, char *name,
> size_t len)
> {
> @@ -233,7 +226,7 @@ static int led_classdev_next_name(const char *init_name, char *name,
> strlcpy(name, init_name, len);
>
> while ((ret < len) &&
> - (dev = class_find_device(leds_class, NULL, name, match_name))) {
> + (dev = class_find_device_by_name(leds_class, name))) {
> put_device(dev);
> ret = snprintf(name, len, "%s_%u", init_name, ++i);
> }
> diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
> index 4124f4d..1bee39c 100644
> --- a/drivers/rtc/interface.c
> +++ b/drivers/rtc/interface.c
> @@ -663,21 +663,12 @@ void rtc_update_irq(struct rtc_device *rtc,
> }
> EXPORT_SYMBOL_GPL(rtc_update_irq);
>
> -static int __rtc_match(struct device *dev, const void *data)
> -{
> - const char *name = data;
> -
> - if (strcmp(dev_name(dev), name) == 0)
> - return 1;
> - return 0;
> -}
> -
> struct rtc_device *rtc_class_open(const char *name)
> {
> struct device *dev;
> struct rtc_device *rtc = NULL;
>
> - dev = class_find_device(rtc_class, NULL, name, __rtc_match);
> + dev = class_find_device_by_name(rtc_class, name);
> if (dev)
> rtc = to_rtc_device(dev);
>
> diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
> index 1058b4b..38a5a47 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 name for find_zcdndev_by_name() */
> -static int __match_zcdn_name(struct device *dev, const void *data)
> -{
> - return strcmp(dev_name(dev), (const char *)data) == 0;
> -}
> -
> /* helper function, matches the devt value for find_zcdndev_by_devt() */
> static int __match_zcdn_devt(struct device *dev, const void *data)
> {
> @@ -152,10 +146,7 @@ static int __match_zcdn_devt(struct device *dev, const void *data)
> */
> static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
> {
> - struct device *dev =
> - class_find_device(zcrypt_class, NULL,
> - (void *) name,
> - __match_zcdn_name);
> + struct device *dev = class_find_device_by_name(zcrypt_class, name);
>
> return dev ? to_zcdn_dev(dev) : NULL;
> }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index f45d8df..07aaa96 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -90,11 +90,6 @@ static int switch_fwnode_match(struct device *dev, const void *fwnode)
> return dev_fwnode(dev) == fwnode;
> }
>
> -static int switch_name_match(struct device *dev, const void *name)
> -{
> - return !strcmp((const char *)name, dev_name(dev));
> -}
> -
> static void *usb_role_switch_match(struct device_connection *con, int ep,
> void *data)
> {
> @@ -107,8 +102,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
> dev = class_find_device(role_class, NULL, con->fwnode,
> switch_fwnode_match);
> } else {
> - dev = class_find_device(role_class, NULL, con->endpoint[ep],
> - switch_name_match);
> + dev = class_find_device_by_name(role_class, con->endpoint[ep]);
> }
>
> return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 2eb6238..18a0687 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -210,11 +210,6 @@ static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
> return dev_fwnode(dev) == fwnode;
> }
>
> -static int typec_port_name_match(struct device *dev, const void *name)
> -{
> - return !strcmp((const char *)name, dev_name(dev));
> -}
> -
> static void *typec_port_match(struct device_connection *con, int ep, void *data)
> {
> struct device *dev;
> @@ -227,8 +222,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
> return class_find_device(typec_class, NULL, con->fwnode,
> typec_port_fwnode_match);
>
> - dev = class_find_device(typec_class, NULL, con->endpoint[ep],
> - typec_port_name_match);
> + dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>
> return dev ? dev : ERR_PTR(-EPROBE_DEFER);
> }
> diff --git a/include/linux/device.h b/include/linux/device.h
> index a449d09..bb14c7f 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -485,6 +485,18 @@ extern struct device *class_find_device(struct class *class,
> struct device *start, const void *data,
> int (*match)(struct device *, const void *));
>
> +/**
> + * class_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @class: class type
> + * @name: name of the device to match
> + */
> +static inline struct device *class_find_device_by_name(struct class *class,
> + const char *name)
> +{
> + return class_find_device(class, NULL, name, device_match_name);
> +}
> +
> struct class_attribute {
> struct attribute attr;
> ssize_t (*show)(struct class *class, struct class_attribute *attr,
> diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
> index 60b7ac5..de259b5 100644
> --- a/net/ieee802154/core.c
> +++ b/net/ieee802154/core.c
> @@ -23,11 +23,6 @@
> LIST_HEAD(cfg802154_rdev_list);
> int cfg802154_rdev_list_generation;
>
> -static int wpan_phy_match(struct device *dev, const void *data)
> -{
> - return !strcmp(dev_name(dev), (const char *)data);
> -}
> -
> struct wpan_phy *wpan_phy_find(const char *str)
> {
> struct device *dev;
> @@ -35,7 +30,7 @@ struct wpan_phy *wpan_phy_find(const char *str)
> if (WARN_ON(!str))
> return NULL;
>
> - dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
> + dev = class_find_device_by_name(&wpan_phy_class, str);
> if (!dev)
> return NULL;
>
> --
> 2.7.4
>

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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