diff options
| author |   Saravana Kannan <saravanak@google.com> | 2021-02-05 14:26:41 -0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-09 14:31:06 +0100 |
| commit | 74c782cff77b3533290148df1fa6f8c7db5e60d5 (patch) | |
| tree | e0ddd425b9a87cda66d3e559e4f74beff26a5e66 /drivers/base | |
| parent | of: property: Add fw_devlink support for optional properties (diff) | |
| download | linux-dev-74c782cff77b3533290148df1fa6f8c7db5e60d5.tar.xz linux-dev-74c782cff77b3533290148df1fa6f8c7db5e60d5.zip | |
driver core: fw_devlink: Handle suppliers that don't use driver core
Device links only work between devices that use the driver core to match
and bind a driver to a device. So, add an API for frameworks to let the
driver core know that a fwnode has been initialized by a driver without
using the driver core.
Then use this information to make sure that fw_devlink doesn't make the
consumers wait indefinitely on suppliers that'll never bind to a driver.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210205222644.2357303-6-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index f466ab4f1c35..ea710b33bda6 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1637,6 +1637,17 @@ static int fw_devlink_create_devlink(struct device *con, sup_dev = get_dev_from_fwnode(sup_handle); if (sup_dev) { /* + * If it's one of those drivers that don't actually bind to + * their device using driver core, then don't wait on this + * supplier device indefinitely. + */ + if (sup_dev->links.status == DL_DEV_NO_DRIVER && + sup_handle->flags & FWNODE_FLAG_INITIALIZED) { + ret = -EINVAL; + goto out; + } + + /* * If this fails, it is due to cycles in device links. Just * give up on this link and treat it as invalid. */ @@ -1655,6 +1666,10 @@ static int fw_devlink_create_devlink(struct device *con, goto out; } + /* Supplier that's already initialized without a struct device. */ + if (sup_handle->flags & FWNODE_FLAG_INITIALIZED) + return -EINVAL; + /* * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports * cycles. So cycle detection isn't necessary and shouldn't be |