-
Steven Rostedt (VMware) authored
If a process has the trace_pipe open on a trace_array, the current tracer for that trace array should not be changed. This was original enforced by a global lock, but when instances were introduced, it was moved to the current_trace. But this structure is shared by all instances, and a trace_pipe is for a single instance. There's no reason that a process that has trace_pipe open on one instance should prevent another instance from changing its current tracer. Move the reference counter to the trace_array instead. This is marked as "Fixes" but is more of a clean up than a true fix. Backport if you want, but its not critical. Fixes: cf6ab6d9 ("tracing: Add ref count to tracer for when they are being read by pipe") Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org>
7ef282e0