tracing: Ensure module defining synth event cannot be unloaded while tracing
commit 21581dd4e7ff6c07d0ab577e3c32b13a74b31522 upstream.
Currently, using synth_event_delete() will fail if the event is being
used (tracing in progress), but that is normally done in the module exit
function. At that stage, failing is problematic as returning a non-zero
status means the module will become locked (impossible to unload or
reload again).
Instead, ensure the module exit function does not get called in the
first place by increasing the module refcnt when the event is enabled.
Cc: [email protected]
Cc: Mathieu Desnoyers <[email protected]>
Fixes: 35ca5207c2d11 ("tracing: Add synthetic event command generation functions")
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Douglas Raillard <[email protected]>
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
1 file changed
