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Code Issues Releases Wiki Activity

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: ed29271894 ("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>
This commit is contained in:
Jiri Olsa 2021-11-09 12:42:17 +01:00 committed by Steven Rostedt (VMware)
parent 51d1579466
commit 2e6e9058d1
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/ftrace.c
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@ -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;