Commit 13619170 authored by Rob Clark's avatar Rob Clark Committed by Georgi Djakov
Browse files

interconnect: Teach lockdep about icc_bw_lock order 



Teach lockdep that icc_bw_lock is needed in code paths that could
deadlock if they trigger reclaim.

Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20230807171148.210181-8-robdclark@gmail.com


Signed-off-by: default avatarGeorgi Djakov <djakov@kernel.org>
parent af42269c

drivers/interconnect/core.c

+9 −1
Original line number Diff line number Diff line
@@ -1041,13 +1041,21 @@ void icc_sync_state(struct device *dev) 
			}

		}

	}

	mutex_unlock(&icc_bw_lock);

	mutex_unlock(&icc_lock);

}

EXPORT_SYMBOL_GPL(icc_sync_state);



static int __init icc_init(void)

{

	struct device_node *root = of_find_node_by_path("/");

	struct device_node *root;



	/* Teach lockdep about lock ordering wrt. shrinker: */

	fs_reclaim_acquire(GFP_KERNEL);

	might_lock(&icc_bw_lock);

	fs_reclaim_release(GFP_KERNEL);



	root = of_find_node_by_path("/");



	providers_count = of_count_icc_providers(root);

	of_node_put(root);