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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-02-07 19:41:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-08 11:26:14 +0100 |
| commit | 70fb9a252317e04bd9af68ed89d4bf6caeb252e4 (patch) | |
| tree | 8e9024b062cd12f25a6785921e328933994f52bf /drivers/base/dd.c | |
| parent | PM-runtime: Take suppliers into account in __pm_runtime_set_status() (diff) | |
| download | linux-70fb9a252317e04bd9af68ed89d4bf6caeb252e4.tar.xz linux-70fb9a252317e04bd9af68ed89d4bf6caeb252e4.zip | |
driver core: Document limitation related to DL_FLAG_RPM_ACTIVE
If device_link_add() is called twice in a row to create a stateless
device link for the same consumer-supplier pair without an attempt
to delete the link between these calls, and the second caller passes
DL_FLAG_RPM_ACTIVE to it in flags, calling either device_link_del()
or device_link_remove() immediately after that will leave the link's
supplier device with nonzero PM-runtime usage counter, which may
prevent the supplier from being runtime-suspended going forward
until the link is deleted by another invocation of device_link_del()
or device_link_remove() for it.
Even though this is confusing and may lead to subtle issues, trying
to avoid it in the framework also may cause problems to appear, so
document it as a known limitation.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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