tracing: Remove locking trace_types_lock from tracing_reset_all_online_cpus()

Commit a82274151af "tracing: Protect ftrace_trace_arrays list in trace_events.c"
added taking the trace_types_lock mutex in trace_events.c as there were
several locations that needed it for protection. Unfortunately, it also
encapsulated a call to tracing_reset_all_online_cpus() which also takes
the trace_types_lock, causing a deadlock.

This happens when a module has tracepoints and has been traced. When the
module is removed, the trace events module notifier will grab the
trace_types_lock, do a bunch of clean ups, and also clears the buffer
by calling tracing_reset_all_online_cpus. This doesn't happen often
which explains why it wasn't caught right away.

Commit a82274151af was marked for stable, which means this must be
sent to stable too.

Link: http://lkml.kernel.org/r/[email protected]

Reported-by: Arend van Spril <[email protected]>
Tested-by: Arend van Spriel <[email protected]>
Cc: Alexander Z Lam <[email protected]>
Cc: Vaibhav Nagarnaik <[email protected]>
Cc: David Sharp <[email protected]>
Cc: [email protected] # 3.10
Signed-off-by: Steven Rostedt <[email protected]>

0 files changed, 0 insertions, 0 deletions