If skl_probe_work() was not run driver ends up dereferencing NULL pointer when operating on lists in skl_platform_unregister(). To fix this initialize lists in skl_create(). Also run cancel_work_sync() before all cleanup functions, so we don't end up unnecessarily running probe work.
Easily reproducible with: while true; do modprobe snd_soc_skl; rmmod snd_soc_skl; done (with the assumption that relevant drivers are added to blacklist on system boot)
Signed-off-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com --- sound/soc/intel/skylake/skl-pcm.c | 3 --- sound/soc/intel/skylake/skl.c | 5 ++++- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c index 8b7232d3ffee..489ecef311ad 100644 --- a/sound/soc/intel/skylake/skl-pcm.c +++ b/sound/soc/intel/skylake/skl-pcm.c @@ -1477,9 +1477,6 @@ int skl_platform_register(struct device *dev) struct hdac_bus *bus = dev_get_drvdata(dev); struct skl *skl = bus_to_skl(bus);
- INIT_LIST_HEAD(&skl->ppl_list); - INIT_LIST_HEAD(&skl->bind_list); - skl->dais = kmemdup(skl_platform_dai, sizeof(skl_platform_dai), GFP_KERNEL); if (!skl->dais) { diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c index fc79401cd474..cae97c65eef8 100644 --- a/sound/soc/intel/skylake/skl.c +++ b/sound/soc/intel/skylake/skl.c @@ -430,7 +430,6 @@ static int skl_free(struct hdac_bus *bus)
snd_hdac_ext_bus_exit(bus);
- cancel_work_sync(&skl->probe_work); if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) { snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false); snd_hdac_i915_exit(bus); @@ -859,6 +858,9 @@ static int skl_create(struct pci_dev *pci, hbus = skl_to_hbus(skl); bus = skl_to_bus(skl);
+ INIT_LIST_HEAD(&skl->ppl_list); + INIT_LIST_HEAD(&skl->bind_list); + #if IS_ENABLED(CONFIG_SND_SOC_INTEL_SKYLAKE_HDAUDIO_CODEC) ext_ops = snd_soc_hdac_hda_get_ops(); #endif @@ -1108,6 +1110,7 @@ static void skl_remove(struct pci_dev *pci) struct hdac_bus *bus = pci_get_drvdata(pci); struct skl *skl = bus_to_skl(bus);
+ cancel_work_sync(&skl->probe_work); release_firmware(skl->tplg);
pm_runtime_get_noresume(&pci->dev);