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| author | Mark Brown <broonie@kernel.org> | 2018-01-08 18:54:50 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-01-08 18:54:50 +0300 |
| commit | 498495dba268b20e8eadd7fe93c140c68b6cc9d2 (patch) | |
| tree | 00d1562049d8bc2194fddd9ba0cbbe0812ad6f68 /sound/soc/intel/skylake/skl-nhlt.c | |
| parent | d5cc0a1fcbb5ddbef9fdd4c4a978da3254ddbf37 (diff) | |
| parent | 5c256045b87b8aa8e5bc9d2e2fdc0802351c1f99 (diff) | |
| download | linux-498495dba268b20e8eadd7fe93c140c68b6cc9d2.tar.xz | |
Merge branch 'fix/intel' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-intel
Diffstat (limited to 'sound/soc/intel/skylake/skl-nhlt.c')
| -rw-r--r-- | sound/soc/intel/skylake/skl-nhlt.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c index bde7f40f29f5..d9b3dc89a1dc 100644 --- a/sound/soc/intel/skylake/skl-nhlt.c +++ b/sound/soc/intel/skylake/skl-nhlt.c @@ -21,6 +21,8 @@ #include "skl.h" #include "skl-i2s.h" +#define NHLT_ACPI_HEADER_SIG "NHLT" + /* Unique identification for getting NHLT blobs */ static guid_t osc_guid = GUID_INIT(0xA69F886E, 0x6CEB, 0x4594, @@ -42,10 +44,18 @@ struct nhlt_acpi_table *skl_nhlt_init(struct device *dev) obj = acpi_evaluate_dsm(handle, &osc_guid, 1, 1, NULL); if (obj && obj->type == ACPI_TYPE_BUFFER) { nhlt_ptr = (struct nhlt_resource_desc *)obj->buffer.pointer; - nhlt_table = (struct nhlt_acpi_table *) + if (nhlt_ptr->length) + nhlt_table = (struct nhlt_acpi_table *) memremap(nhlt_ptr->min_addr, nhlt_ptr->length, MEMREMAP_WB); ACPI_FREE(obj); + if (nhlt_table && (strncmp(nhlt_table->header.signature, + NHLT_ACPI_HEADER_SIG, + strlen(NHLT_ACPI_HEADER_SIG)) != 0)) { + memunmap(nhlt_table); + dev_err(dev, "NHLT ACPI header signature incorrect\n"); + return NULL; + } return nhlt_table; } |