diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-02-01 01:59:42 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-20 11:55:58 +0100 |
| commit | 822e87b74f1e0ef543b298c8121a78c382cceeb3 (patch) | |
| tree | e8c22e237ea890e96479142b37291940b77c1973 /drivers/base/core.c | |
| parent | 1f5102cb6bc935eadb8d543c31119195a3e60a14 (diff) | |
driver core: Add device link flag DL_FLAG_AUTOPROBE_CONSUMER
commit e7dd40105aac9ba051e44ad711123bc53a5e4c71 upstream.
Add a new device link flag, DL_FLAG_AUTOPROBE_CONSUMER, to request the
driver core to probe for a consumer driver automatically after binding
a driver to the supplier device on a persistent managed device link.
As unbinding the supplier driver on a managed device link causes the
consumer driver to be detached from its device automatically, this
flag provides a complementary mechanism which is needed to address
some "composite device" use cases.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/core.c')
| -rw-r--r-- | drivers/base/core.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index d8273792950b..3495da13b18a 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -195,6 +195,12 @@ void device_pm_move_to_tail(struct device *dev) * the link will be maintained until one of the devices pointed to by it (either * the consumer or the supplier) is unregistered. * + * Also, if DL_FLAG_STATELESS, DL_FLAG_AUTOREMOVE_CONSUMER and + * DL_FLAG_AUTOREMOVE_SUPPLIER are not set in @flags (that is, a persistent + * managed device link is being added), the DL_FLAG_AUTOPROBE_CONSUMER flag can + * be used to request the driver core to automaticall probe for a consmer + * driver after successfully binding a driver to the supplier device. + * * The combination of DL_FLAG_STATELESS and either DL_FLAG_AUTOREMOVE_CONSUMER * or DL_FLAG_AUTOREMOVE_SUPPLIER set in @flags at the same time is invalid and * will cause NULL to be returned upfront. @@ -215,7 +221,12 @@ struct device_link *device_link_add(struct device *consumer, if (!consumer || !supplier || (flags & DL_FLAG_STATELESS && - flags & (DL_FLAG_AUTOREMOVE_CONSUMER | DL_FLAG_AUTOREMOVE_SUPPLIER))) + flags & (DL_FLAG_AUTOREMOVE_CONSUMER | + DL_FLAG_AUTOREMOVE_SUPPLIER | + DL_FLAG_AUTOPROBE_CONSUMER)) || + (flags & DL_FLAG_AUTOPROBE_CONSUMER && + flags & (DL_FLAG_AUTOREMOVE_CONSUMER | + DL_FLAG_AUTOREMOVE_SUPPLIER))) return NULL; if (flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) { @@ -576,6 +587,9 @@ void device_links_driver_bound(struct device *dev) WARN_ON(link->status != DL_STATE_DORMANT); WRITE_ONCE(link->status, DL_STATE_AVAILABLE); + + if (link->flags & DL_FLAG_AUTOPROBE_CONSUMER) + driver_deferred_probe_add(link->consumer); } list_for_each_entry(link, &dev->links.suppliers, c_node) { |