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| author |   Jiri Olsa <jolsa@redhat.com> | 2021-11-09 12:42:17 +0100 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-11-10 11:56:43 -0500 |
| commit | 2e6e9058d13a22a6fdd36a8c444ac71d9656003a (patch) | |
| tree | 9c92cf986ff75d8e243d68cfe6b0921cd96775c7 /kernel/trace | |
| parent | ring-buffer: Protect ring_buffer_reset() from reentrancy (diff) | |
| download | linux-dev-2e6e9058d13a22a6fdd36a8c444ac71d9656003a.tar.xz linux-dev-2e6e9058d13a22a6fdd36a8c444ac71d9656003a.zip | |
ftrace/direct: Fix lockup in modify_ftrace_direct_multi
We can't call unregister_ftrace_function under ftrace_lock.
Link: https://lkml.kernel.org/r/20211109114217.1645296-1-jolsa@kernel.org
Fixes: ed29271894aa ("ftrace/direct: Do not disable when switching direct callers")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ftrace.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index b4ed1a301232..fc49e8809a56 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -5602,10 +5602,11 @@ int modify_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr) } } + mutex_unlock(&ftrace_lock); + /* Removing the tmp_ops will add the updated direct callers to the functions */ unregister_ftrace_function(&tmp_ops); - mutex_unlock(&ftrace_lock); out_direct: mutex_unlock(&direct_mutex); return err; |