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authorPeter Ujfalusi <peter.ujfalusi@linux.intel.com>2021-07-26 21:21:42 +0300
committerMark Brown <broonie@kernel.org>2021-07-27 15:13:04 +0300
commit2635c226036c1bf44b86575d0bc721505c8201e3 (patch)
treef359270b9d59421592217572562a407b37e7c922 /sound
parent0f32d9eb38c13c32895b5bf695eac639cee02d6c (diff)
downloadlinux-2635c226036c1bf44b86575d0bc721505c8201e3.tar.xz
ASoC: topology: Select SND_DYNAMIC_MINORS
The indexes of the devices are described within the topology file, it is a possibility that the topology encodes invalid indexes when DYNAMIC_MINORS is not enabled in kernel: #define SNDRV_MINOR_COMPRESS 2 /* 2 - 3 */ #define SNDRV_MINOR_HWDEP 4 /* 4 - 7 */ #define SNDRV_MINOR_RAWMIDI 8 /* 8 - 15 */ #define SNDRV_MINOR_PCM_PLAYBACK 16 /* 16 - 23 */ #define SNDRV_MINOR_PCM_CAPTURE 24 /* 24 - 31 */ If the topology assigns an index greater than 7 for PLAYBACK/CAPTURE PCM then there will be minor number collision. As an example: card0 creates a capture PCM with index 10 -> minor = 34 card1 creates compress device with index 0 -> minor = 34 Card1 will fail to instantiate because the minor for the compress stream is already taken. To avoid seemingly mysterious issues with card creation, select the DYNAMIC_MINORS when the topology is enabled. The other option would be to try to do out of bound index checks in case of DYNAMIC_MINOR is not enabled and do not even attempt to create the device with failing the topology load. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20210726182142.179604-1-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index 8a13462e1a63..5dcf77af07af 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -36,6 +36,7 @@ config SND_SOC_COMPRESS
config SND_SOC_TOPOLOGY
bool
+ select SND_DYNAMIC_MINORS
config SND_SOC_TOPOLOGY_KUNIT_TEST
tristate "KUnit tests for SoC topology"