diff options
| author | Rob Clark <robdclark@chromium.org> | 2023-08-07 10:11:41 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 11:11:13 +0200 |
| commit | 0db211ec0f1d32b93486e8f6565249ad4d1bece5 (patch) | |
| tree | 97971b2893b4d05d6e67eb4ab36f72797a25332b | |
| parent | b93aeb6352b0229e3c5ca5ca4ff015b015aff33c (diff) | |
interconnect: Teach lockdep about icc_bw_lock order
commit 13619170303878e1dae86d9a58b039475c957fcf upstream.
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>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/interconnect/core.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index f4a493d78ee9..e4b2d9ef61b4 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -1145,13 +1145,21 @@ 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); |