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ASoC: SOF: trace: fix unconditional free in trace release 

[ Upstream commit e6110114d1 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Kai Vehmanen 2020-01-24 15:36:22 -06:00 committed by Greg Kroah-Hartman
parent 01fad934f1
commit ca958fe8af
1 changed files with 5 additions and 2 deletions
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7
sound/soc/sof/trace.c
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@ -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);