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| 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 /Documentation | |
| parent | 1f5102cb6bc935eadb8d543c31119195a3e60a14 (diff) | |
| download | linux-stable-822e87b74f1e0ef543b298c8121a78c382cceeb3.tar.gz linux-stable-822e87b74f1e0ef543b298c8121a78c382cceeb3.tar.bz2 linux-stable-822e87b74f1e0ef543b298c8121a78c382cceeb3.zip | |
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 'Documentation')
| -rw-r--r-- | Documentation/driver-api/device_link.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/driver-api/device_link.rst b/Documentation/driver-api/device_link.rst index e249e074a8d2..c764755121c7 100644 --- a/Documentation/driver-api/device_link.rst +++ b/Documentation/driver-api/device_link.rst @@ -94,6 +94,15 @@ Similarly, when the device link is added from supplier's ``->probe`` callback, ``DL_FLAG_AUTOREMOVE_SUPPLIER`` causes the device link to be automatically purged when the supplier fails to probe or later unbinds. +If neither ``DL_FLAG_AUTOREMOVE_CONSUMER`` nor ``DL_FLAG_AUTOREMOVE_SUPPLIER`` +is set, ``DL_FLAG_AUTOPROBE_CONSUMER`` can be used to request the driver core +to probe for a driver for the consumer driver on the link automatically after +a driver has been bound to the supplier device. + +Note, however, that any combinations of ``DL_FLAG_AUTOREMOVE_CONSUMER``, +``DL_FLAG_AUTOREMOVE_SUPPLIER`` or ``DL_FLAG_AUTOPROBE_CONSUMER`` with +``DL_FLAG_STATELESS`` are invalid and cannot be used. + Limitations =========== |