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

[Kevin Strasser]

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,
 						  sst_acpi_mach_match,
 						  &found, NULL)) && found)
-- 
1.9.1

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