From 6751667a29d6fd64afb9ce30567ad616b68ed789 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Tue, 16 Aug 2016 14:34:18 +0100 Subject: driver core: Add deferred_probe attribute to devices in sysfs It is sometimes useful to know that a device is on the deferred probe list rather than, say, not having a driver available. Expose this information to user-space. Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/base/dd.c') diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 43be1cc751a4..a48cf444eca5 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -53,6 +53,19 @@ static LIST_HEAD(deferred_probe_pending_list); static LIST_HEAD(deferred_probe_active_list); static atomic_t deferred_trigger_count = ATOMIC_INIT(0); +static ssize_t deferred_probe_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + bool value; + + mutex_lock(&deferred_probe_mutex); + value = !list_empty(&dev->p->deferred_probe); + mutex_unlock(&deferred_probe_mutex); + + return sprintf(buf, "%d\n", value); +} +DEVICE_ATTR_RO(deferred_probe); + /* * In some cases, like suspend to RAM or hibernation, It might be reasonable * to prohibit probing of devices as it could be unsafe. -- cgit v1.2.3