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| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2021-11-19 17:08:50 -0600 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-11-24 12:57:18 +0000 |
| commit | b456abe63f60ad93c83a526d33b71574bc32656c (patch) | |
| tree | 94c85af14b3d80371e201924a4209673f2723423 /drivers/gpu | |
| parent | 0e888a74e52db369e19aec908131cf171079b306 (diff) | |
ALSA: pcm: introduce INFO_NO_REWINDS flag
When the hardware can only deal with a monotonically increasing
appl_ptr, this flag can be set.
In case the application requests a rewind, be it with a
snd_pcm_rewind() or with a direct change of a mmap'ed pointer followed
by a SNDRV_PCM_IOCTL_SYNC_PTR, this patch checks if a rewind
occurred and returns an error.
Credits to Takashi Iwai for identifying the path with SYNC_PTR and
suggesting the pointer checks.
Suggested-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211119230852.206310-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/gpu')
0 files changed, 0 insertions, 0 deletions