mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

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: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20230807171148.210181-8-robdclark@gmail.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>
This commit is contained in:
Rob Clark 2023-08-07 10:11:41 -07:00 committed by Georgi Djakov
parent af42269c35
commit 1361917030
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/interconnect/core.c
View File

@ -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);