tree 968137a7e069521734daacde26c23244ca1c2089
parent 9ef16693aff8137faa21d16ffe65bb9832d24d71
author Steven Rostedt (VMware) <rostedt@goodmis.org> 1570832357 -0400
committer Steven Rostedt (VMware) <rostedt@goodmis.org> 1570927250 -0400

tracing: Get trace_array reference for available_tracers files

As instances may have different tracers available, we need to look at the
trace_array descriptor that shows the list of the available tracers for the
instance. But there's a race between opening the file and an admin
deleting the instance. The trace_array_get() needs to be called before
accessing the trace_array.

Cc: stable@vger.kernel.org
Fixes: 607e2ea167e56 ("tracing: Set up infrastructure to allow tracers for instances")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>