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interconnect: Teach lockdep about icc_bw_lock order

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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>
This commit is contained in:
Rob Clark 2023-08-07 10:11:41 -07:00 committed by Greg Kroah-Hartman
parent b93aeb6352
commit 0db211ec0f
1 changed files with 9 additions and 1 deletions
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10
drivers/interconnect/core.c
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@ -1145,13 +1145,21 @@ void icc_sync_state(struct device *dev)
} }
} }
} }
mutex_unlock(&icc_bw_lock);
mutex_unlock(&icc_lock); mutex_unlock(&icc_lock);
} }
EXPORT_SYMBOL_GPL(icc_sync_state); EXPORT_SYMBOL_GPL(icc_sync_state);
static int __init icc_init(void) 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); providers_count = of_count_icc_providers(root);
of_node_put(root); of_node_put(root);