@@ -19,6 +19,7 @@
#include <linux/device.h>
#include <linux/delay.h>
+#include <linux/notifier.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/wait.h>
@@ -53,6 +54,7 @@ static LIST_HEAD(deferred_probe_pending_list);
static LIST_HEAD(deferred_probe_active_list);
static struct workqueue_struct *deferred_wq;
static atomic_t deferred_trigger_count = ATOMIC_INIT(0);
+static BLOCKING_NOTIFIER_HEAD(deferred_notifier_head);
/*
* In some cases, like suspend to RAM or hibernation, It might be reasonable
@@ -113,6 +115,9 @@ static void deferred_probe_work_func(struct work_struct *work)
put_device(dev);
}
mutex_unlock(&deferred_probe_mutex);
+
+ /* Notify any listeners about triggering deferred probe */
+ blocking_notifier_call_chain(&deferred_notifier_head, 0, NULL);
}
static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func);
@@ -224,6 +229,32 @@ static int deferred_probe_initcall(void)
late_initcall(deferred_probe_initcall);
/**
+ * deferred_probe_register_notifier - Register a notifier for deferred probe
+ * @nb: notifier block to signal
+ *
+ * This function allows caller to get a notification when deferred probe has
+ * been triggered. This lets it to retry some actions, which earlier failed
+ * with -EPROBE_DEFER error code.
+ */
+int deferred_probe_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&deferred_notifier_head, nb);
+}
+EXPORT_SYMBOL_GPL(deferred_probe_register_notifier);
+
+/**
+ * deferred_probe_unregister_notifier - Unregister a notifier
+ * @nb: notifier block to signal
+ *
+ * Unregister a previously registered deferred probe notifier.
+ */
+int deferred_probe_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&deferred_notifier_head, nb);
+}
+EXPORT_SYMBOL_GPL(deferred_probe_unregister_notifier);
+
+/**
* device_is_bound() - Check if device is bound to a driver
* @dev: device to check
*
@@ -1066,6 +1066,9 @@ extern int __must_check device_reprobe(struct device *dev);
extern bool device_is_bound(struct device *dev);
+extern int deferred_probe_register_notifier(struct notifier_block *nb);
+extern int deferred_probe_unregister_notifier(struct notifier_block *nb);
+
/*
* Easy functions for dynamically creating devices on the fly
*/
This patch adds code which allow other subsystems get a notification when deferred probe has been triggered. This way one can retry some actions, which earlier failed with -EPROBE_DEFER error code. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- drivers/base/dd.c | 31 +++++++++++++++++++++++++++++++ include/linux/device.h | 3 +++ 2 files changed, 34 insertions(+) -- 1.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html