From ca958fe8af205e900cab8d2793c54fabc04c0f94 Mon Sep 17 00:00:00 2001 From: Kai Vehmanen Date: Fri, 24 Jan 2020 15:36:22 -0600 Subject: [PATCH] ASoC: SOF: trace: fix unconditional free in trace release [ Upstream commit e6110114d18d330c05fd6de9f31283fd086a5a3a ] 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 Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20200124213625.30186-5-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- 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 4c3cff031fd6..fd6f5913782b 100644 --- a/sound/soc/sof/trace.c +++ b/sound/soc/sof/trace.c @@ -328,7 +328,10 @@ 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);