From e6110114d18d330c05fd6de9f31283fd086a5a3a Mon Sep 17 00:00:00 2001
From: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Date: Fri, 24 Jan 2020 15:36:22 -0600
Subject: [PATCH] ASoC: SOF: trace: fix unconditional free in trace release
Git-commit: e6110114d18d330c05fd6de9f31283fd086a5a3a
Patch-mainline: v5.6-rc1
References: jsc#SLE-16518

Check if DMA pages were successfully allocated in initialization
before calling free. For many types of memory (like sgbufs)
the extra free is harmless, but not all backends track allocation
state, so add an explicit check.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200124213625.30186-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/sof/trace.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/trace.c b/sound/soc/sof/trace.c
index 4bb65030819d..d815090252f8 100644
--- a/sound/soc/sof/trace.c
+++ b/sound/soc/sof/trace.c
@@ -343,7 +343,10 @@ void snd_sof_free_trace(struct snd_sof_dev *sdev)
 
 	snd_sof_release_trace(sdev);
 
-	snd_dma_free_pages(&sdev->dmatb);
-	snd_dma_free_pages(&sdev->dmatp);
+	if (sdev->dma_trace_pages) {
+		snd_dma_free_pages(&sdev->dmatb);
+		snd_dma_free_pages(&sdev->dmatp);
+		sdev->dma_trace_pages = 0;
+	}
 }
 EXPORT_SYMBOL(snd_sof_free_trace);
-- 
2.16.4