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| author | Ben Hutchings <ben.hutchings@codethink.co.uk> | 2016-08-16 16:34:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-10 19:22:23 +0300 |
| commit | 6751667a29d6fd64afb9ce30567ad616b68ed789 (patch) | |
| tree | 128403d3fb1187222f340b3676310ef376d17699 /drivers/base/dd.c | |
| parent | baa8809f60971d10220dfe79248f54b2b265f003 (diff) | |
| download | linux-6751667a29d6fd64afb9ce30567ad616b68ed789.tar.xz | |
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 <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/dd.c')
| -rw-r--r-- | drivers/base/dd.c | 13 |
1 files changed, 13 insertions, 0 deletions
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. |