This is a note to let you know that I've just added the patch titled
clk: Remove prepare_lock hold assertion in __clk_release()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-remove-prepare_lock-hold-assertion-in-__clk_rele.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7f548c4365194a6e5374b1b578fcd8dd50615c67
Author: Stephen Boyd <sboyd@xxxxxxxxxx>
Date: Mon Mar 25 11:41:55 2024 -0700
clk: Remove prepare_lock hold assertion in __clk_release()
[ Upstream commit 8358a76cfb47c9a5af627a0c4e7168aa14fa25f6 ]
Removing this assertion lets us move the kref_put() call outside the
prepare_lock section. We don't need to hold the prepare_lock here to
free memory and destroy the clk_core structure. We've already unlinked
the clk from the clk tree and by the time the release function runs
nothing holds a reference to the clk_core anymore so anything with the
pointer can't access the memory that's being freed anyway. Way back in
commit 496eadf821c2 ("clk: Use lockdep asserts to find missing hold of
prepare_lock") we didn't need to have this assertion either.
Fixes: 496eadf821c2 ("clk: Use lockdep asserts to find missing hold of prepare_lock")
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240325184204.745706-2-sboyd@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 84397af4fb336..acbe917cbe775 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -4047,8 +4047,6 @@ static void __clk_release(struct kref *ref)
{
struct clk_core *core = container_of(ref, struct clk_core, ref);
- lockdep_assert_held(&prepare_lock);
-
clk_core_free_parent_map(core);
kfree_const(core->name);
kfree(core);
