Audio drivers such as HDaudio legacy and SOF rely on a workqueue to split the probe into two, with a first pass returning success immediately, and the second pass taking a lot more time due to the use of request_module() and the DSP initializations.
This workqueue-based solution helps deal with conflicting requirements a) other drivers should not be blocked by a long probe b) a PROBE_PREFER_ASYNCHRONOUS probe_type is explicitly not allowed to avoid a deadlock when request_module() is used.
This patch makes sure the deferred probe framework is triggered when the provider of resources successfully completes its initialization.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/soc/sof/core.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c index 3e4dd4a86363..cecc0e914807 100644 --- a/sound/soc/sof/core.c +++ b/sound/soc/sof/core.c @@ -251,6 +251,9 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
sdev->probe_completed = true;
+ /* kick-off re-probing of deferred devices */ + driver_deferred_probe_trigger(); + return 0;
fw_trace_err: