Some configurations expose no NHLT table at all within their
/sys/firmware/acpi/tables. To prevent NULL-dereference errors from
occurring, adjust probe flow and append additional safety checks in
functions involved in NHLT lifecycle.
Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
---
sound/soc/intel/skylake/skl-nhlt.c | 3 ++-
sound/soc/intel/skylake/skl.c | 9 +++++++--
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c
index 19f328d71f24..d9c8f5cb389e 100644
--- a/sound/soc/intel/skylake/skl-nhlt.c
+++ b/sound/soc/intel/skylake/skl-nhlt.c
@@ -182,7 +182,8 @@ void skl_nhlt_remove_sysfs(struct skl_dev *skl)
{
struct device *dev = &skl->pci->dev;
- sysfs_remove_file(&dev->kobj, &dev_attr_platform_id.attr);
+ if (skl->nhlt)
+ sysfs_remove_file(&dev->kobj, &dev_attr_platform_id.attr);
}
/*
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index e2e531c96dd1..7ad8a75759bd 100644
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -633,6 +633,9 @@ static int skl_clock_device_register(struct skl_dev *skl)
struct platform_device_info pdevinfo = {NULL};
struct skl_clk_pdata *clk_pdata;
+ if (!skl->nhlt)
+ return 0;
+
clk_pdata = devm_kzalloc(&skl->pci->dev, sizeof(*clk_pdata),
GFP_KERNEL);
if (!clk_pdata)
@@ -1074,7 +1077,8 @@ static int skl_probe(struct pci_dev *pci,
out_clk_free:
skl_clock_device_unregister(skl);
out_nhlt_free:
- intel_nhlt_free(skl->nhlt);
+ if (skl->nhlt)
+ intel_nhlt_free(skl->nhlt);
out_free:
skl_free(bus);
@@ -1123,7 +1127,8 @@ static void skl_remove(struct pci_dev *pci)
skl_dmic_device_unregister(skl);
skl_clock_device_unregister(skl);
skl_nhlt_remove_sysfs(skl);
- intel_nhlt_free(skl->nhlt);
+ if (skl->nhlt)
+ intel_nhlt_free(skl->nhlt);
skl_free(bus);
dev_set_drvdata(&pci->dev, NULL);
}
--
2.17.1
