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| author | Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> | 2019-06-17 13:36:34 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-06-25 15:32:47 +0100 |
| commit | 776cb3b80ede9ef4ad4c8aac22fcbdf4852b44cd (patch) | |
| tree | d045225f50541b7ed9ede92d694f58c919d944d9 | |
| parent | d5fcaaba54ce729a018e50938aa6d355cffc7ef4 (diff) | |
| download | linux-776cb3b80ede9ef4ad4c8aac22fcbdf4852b44cd.tar.bz2 | |
ASoC: Intel: Skylake: Initialize lists before access so they are safe to use
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>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | sound/soc/intel/skylake/skl-pcm.c | 3 | ||||
| -rw-r--r-- | 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 4fc78be2f751..da01359cfdfd 100644 --- a/sound/soc/intel/skylake/skl-pcm.c +++ b/sound/soc/intel/skylake/skl-pcm.c @@ -1498,9 +1498,6 @@ 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 f864f7b3df3a..6d6401410250 100644 --- a/sound/soc/intel/skylake/skl.c +++ b/sound/soc/intel/skylake/skl.c @@ -438,7 +438,6 @@ 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); @@ -867,6 +866,9 @@ 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 @@ -1116,6 +1118,7 @@ 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); |