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path: root/drivers/base/dd.c
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Diffstat (limited to 'drivers/base/dd.c')
-rw-r--r--drivers/base/dd.c32
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 4882f06d12df..ad44b40fe284 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -20,6 +20,7 @@
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
+#include <linux/init.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/wait.h>
@@ -53,6 +54,7 @@ static DEFINE_MUTEX(deferred_probe_mutex);
static LIST_HEAD(deferred_probe_pending_list);
static LIST_HEAD(deferred_probe_active_list);
static atomic_t deferred_trigger_count = ATOMIC_INIT(0);
+static bool initcalls_done;
/*
* In some cases, like suspend to RAM or hibernation, It might be reasonable
@@ -62,6 +64,26 @@ static atomic_t deferred_trigger_count = ATOMIC_INIT(0);
static bool defer_all_probes;
/*
+ * For initcall_debug, show the deferred probes executed in late_initcall
+ * processing.
+ */
+static void deferred_probe_debug(struct device *dev)
+{
+ ktime_t calltime, delta, rettime;
+ unsigned long long duration;
+
+ printk(KERN_DEBUG "deferred probe %s @ %i\n", dev_name(dev),
+ task_pid_nr(current));
+ calltime = ktime_get();
+ bus_probe_device(dev);
+ rettime = ktime_get();
+ delta = ktime_sub(rettime, calltime);
+ duration = (unsigned long long) ktime_to_ns(delta) >> 10;
+ printk(KERN_DEBUG "deferred probe %s returned after %lld usecs\n",
+ dev_name(dev), duration);
+}
+
+/*
* deferred_probe_work_func() - Retry probing devices in the active list.
*/
static void deferred_probe_work_func(struct work_struct *work)
@@ -106,7 +128,10 @@ static void deferred_probe_work_func(struct work_struct *work)
device_pm_unlock();
dev_dbg(dev, "Retrying from deferred list\n");
- bus_probe_device(dev);
+ if (initcall_debug && !initcalls_done)
+ deferred_probe_debug(dev);
+ else
+ bus_probe_device(dev);
mutex_lock(&deferred_probe_mutex);
@@ -215,6 +240,7 @@ static int deferred_probe_initcall(void)
driver_deferred_probe_trigger();
/* Sort as many dependencies as possible before exiting initcalls */
flush_work(&deferred_probe_work);
+ initcalls_done = true;
return 0;
}
late_initcall(deferred_probe_initcall);
@@ -259,6 +285,8 @@ static void driver_bound(struct device *dev)
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_BOUND_DRIVER, dev);
+
+ kobject_uevent(&dev->kobj, KOBJ_BIND);
}
static int driver_sysfs_add(struct device *dev)
@@ -848,6 +876,8 @@ static void __device_release_driver(struct device *dev, struct device *parent)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
+
+ kobject_uevent(&dev->kobj, KOBJ_UNBIND);
}
}