[PATCH] ASoC: Intel: fix possible acpi enumeration panic

From: Kevin Strasser
Date: Thu Dec 11 2014 - 02:21:36 EST

A crash can occur on some platforms where adsp is enumerated but codec
is not matched. Check that the codec_id string is valid before
attempting to match.

Signed-off-by: Kevin Strasser <kevin.strasser@xxxxxxxxx>
sound/soc/intel/sst/sst_acpi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/intel/sst/sst_acpi.c b/sound/soc/intel/sst/sst_acpi.c
index 31124aa..dd72e58 100644
--- a/sound/soc/intel/sst/sst_acpi.c
+++ b/sound/soc/intel/sst/sst_acpi.c
@@ -236,7 +236,7 @@ static struct sst_machines *sst_acpi_find_machine(
struct sst_machines *mach;
bool found = false;

- for (mach = machines; mach->codec_id; mach++)
+ for (mach = machines; mach->codec_id[0]; mach++)
if (ACPI_SUCCESS(acpi_get_devices(mach->codec_id,
&found, NULL)) && found)

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