diff options
| -rw-r--r-- | drivers/base/dd.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c index c17fefc77345..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); |