Re: [PATCH v2] watchdog: Add a device managed API for watchdog_register_device()

[Guenter Roeck]

On 05/27/2016 08:33 AM, Neil Armstrong wrote:

This helps in reducing code in .remove callbacks and sometimes
dropping .remove callbacks entirely.

Changes since v1 at 
http://lkml.kernel.org/r/1464251510-15554-1-git-send-email-narmstr...@baylibre.com
 :
- Fix brackets in devm_watchdog_register_device()

Hi Neil,

For future patches: Change log after '---', please.

Signed-off-by: Neil Armstrong <narmstr...@baylibre.com>

Reviewed-by: Guenter Roeck <li...@roeck-us.net>

Thanks,
Guenter

---
  Documentation/driver-model/devres.txt |  3 +++
  drivers/watchdog/watchdog_core.c      | 37 +++++++++++++++++++++++++++++++++++
  include/linux/watchdog.h              |  3 +++
  3 files changed, 43 insertions(+)

diff --git a/Documentation/driver-model/devres.txt 
b/Documentation/driver-model/devres.txt
index c63eea0..589296b 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -357,3 +357,6 @@ SLAVE DMA ENGINE

  SPI
    devm_spi_register_master()
+
+WATCHDOG
+  devm_watchdog_register_device()
diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 981a668..7c5e3dc 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -329,6 +329,43 @@ void watchdog_unregister_device(struct watchdog_device 
*wdd)

  EXPORT_SYMBOL_GPL(watchdog_unregister_device);

+static void devm_watchdog_unregister_device(struct device *dev, void *res)
+{
+       watchdog_unregister_device(*(struct watchdog_device **)res);
+}
+
+/**
+ * devm_watchdog_register_device() - resource managed 
watchdog_register_device()
+ * @dev: device that is registering this watchdog device
+ * @wdd: watchdog device
+ *
+ * Managed watchdog_register_device(). For watchdog device registered by this
+ * function,  watchdog_unregister_device() is automatically called on driver
+ * detach. See watchdog_register_device() for more information.
+ */
+int devm_watchdog_register_device(struct device *dev,
+                               struct watchdog_device *wdd)
+{
+       struct watchdog_device **rcwdd;
+       int ret;
+
+       rcwdd = devres_alloc(devm_watchdog_unregister_device, sizeof(*wdd),
+                            GFP_KERNEL);
+       if (!rcwdd)
+               return -ENOMEM;
+
+       ret = watchdog_register_device(wdd);
+       if (!ret) {
+               *rcwdd = wdd;
+               devres_add(dev, rcwdd);
+       } else {
+               devres_free(rcwdd);
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(devm_watchdog_register_device);
+
  static int __init watchdog_deferred_registration(void)
  {
        mutex_lock(&wtd_deferred_reg_mutex);
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 51732d6c..6b75e38 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -180,4 +180,7 @@ extern int watchdog_init_timeout(struct watchdog_device 
*wdd,
  extern int watchdog_register_device(struct watchdog_device *);
  extern void watchdog_unregister_device(struct watchdog_device *);

+/* devres register variant */
+int devm_watchdog_register_device(struct device *dev, struct watchdog_device 
*);
+
  #endif  /* ifndef _LINUX_WATCHDOG_H */