On Thu, 2024-02-29 at 09:39 +0100, Herve Codina wrote:
In the following sequence: 1) of_platform_depopulate() 2) of_overlay_remove()
During the step 1, devices are destroyed and devlinks are removed. During the step 2, OF nodes are destroyed but __of_changeset_entry_destroy() can raise warnings related to missing of_node_put(): ERROR: memory leak, expected refcount 1 instead of 2 ...
Indeed, during the devlink removals performed at step 1, the removal itself releasing the device (and the attached of_node) is done by a job queued in a workqueue and so, it is done asynchronously with respect to function calls. When the warning is present, of_node_put() will be called but wrongly too late from the workqueue job.
In order to be sure that any ongoing devlink removals are done before the of_node destruction, synchronize the of_overlay_remove() with the devlink removals.
Fixes: 80dd33cf72d1 ("drivers: base: Fix device link removal") Cc: stable@vger.kernel.org Signed-off-by: Herve Codina herve.codina@bootlin.com
drivers/of/overlay.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c index 2ae7e9d24a64..99659ae9fb28 100644 --- a/drivers/of/overlay.c +++ b/drivers/of/overlay.c
In the cover, you mention device.h inclusion but I'm not seeing it? This is clearly up to the DT maintainers to decide but, IMHO, I would very much prefer to see fwnode.h included in here rather than directly device.h (so yeah, renaming the function to fwnode_*). But yeah, I might be biased by own series :)
- Nuno Sá