linux-kernel - [PATCH AUTOSEL 4.19 046/123] ASoC: acpi: fix: continue searching when machine is ignored

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Date:   Wed,  5 Dec 2018 04:34:38 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Keyon Jie <yang.jie@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 046/123] ASoC: acpi: fix: continue searching when machine is ignored

From: Keyon Jie <yang.jie@...ux.intel.com>

[ Upstream commit a3e620f8422832afd832ad5e20aa97d0c72bada8 ]

The machine_quirk may return NULL which means the acpi entries should be
skipped and search for next matched entry is needed, here add return
check here and continue for NULL case.

Signed-off-by: Keyon Jie <yang.jie@...ux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/soc-acpi.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
index b8e72b52db30..4fb29f0e561e 100644
--- a/sound/soc/soc-acpi.c
+++ b/sound/soc/soc-acpi.c
@@ -10,11 +10,17 @@ struct snd_soc_acpi_mach *
 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
 {
 	struct snd_soc_acpi_mach *mach;
+	struct snd_soc_acpi_mach *mach_alt;
 
 	for (mach = machines; mach->id[0]; mach++) {
 		if (acpi_dev_present(mach->id, NULL, -1)) {
-			if (mach->machine_quirk)
-				mach = mach->machine_quirk(mach);
+			if (mach->machine_quirk) {
+				mach_alt = mach->machine_quirk(mach);
+				if (!mach_alt)
+					continue; /* not full match, ignore */
+				mach = mach_alt;
+			}
+
 			return mach;
 		}
 	}
-- 
2.17.1