If the DSP suffers an unrecoverable error, the driver likely knows about this, however the framework may not get informed because errors returned from pointer requests are ignored within the framework.
Things work out fine if user-space is doing a read as reads return error status back to user-space so the user can find out that things have gone bad. However, if user-space is doing an avail request there is no path for the error to come back up to user-space. The pointer request returns zero available data, so a read never happens and we basically just end up sitting waiting for data on a stream that we know full well has died.
This patch set attempts to address this and ensure that errors are fully propagated to user-space and we don't ever end up wait for data that will never come.
Changes since v6: - Series rebased on top of my other series fixing the return values from snd_compr_poll
These are based on Takashi's tree, as all the ADSP conflicts are now straightened out, although there is a reasonable chance we will do more ADSP during this cycle.
Thanks, Charles
Charles Keepax (3): ALSA: compress: Add function to indicate the stream has gone bad ASoC: wm_adsp: Use new snd_compr_stop_error to signal stream failure ASoC: wm_adsp: Treat missing compressed buffer as a fatal error
include/sound/compress_driver.h | 5 +++ sound/core/compress_offload.c | 67 +++++++++++++++++++++++++++++++++++++++-- sound/soc/codecs/wm_adsp.c | 21 ++++++------- 3 files changed, 80 insertions(+), 13 deletions(-)