net: wwan: iosm: allow trace port be uninitialized
Collecting modem firmware traces is optional for the regular modem use. There are not many reasons for aborting device initialization due to an inability to initialize the trace port and (or) its debugfs interface. So, demote the initialization failure erro message into a warning and do not break the initialization sequence in this case. Rework packet processing and deinitialization so that they do not crash in case of uninitialized trace port. This change is mainly a preparation for an upcoming configuration option introduction that will help disable driver debugfs functionality. Signed-off-by: NSergey Ryazanov <ryazanov.s.a@gmail.com> Reviewed-by: NLoic Poulain <loic.poulain@linaro.org> Acked-by: NM Chetan Kumar <m.chetan.kumar@intel.com> Signed-off-by: NJakub Kicinski <kuba@kernel.org>
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