[alsa-devel] [PATCH] ASoC: davinci-mcasp: Use a copy of pdata per instance during DT boot

[Peter Ujfalusi]

Instead of modifying the static pdata struct per McASP instance we need to
allocate pdata for each McASP.
This way we can avoid configuration leakage from prior McASP to McASP
drivers probed at later time.

Reported-by: Misael Lopez Cruz <misael.lopez at ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
 sound/soc/davinci/davinci-mcasp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index f8cb3c7d3c45..e10cfda21d89 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -1620,7 +1620,14 @@ static struct davinci_mcasp_pdata *davinci_mcasp_set_pdata_from_of(
 		pdata = pdev->dev.platform_data;
 		return pdata;
 	} else if (match) {
-		pdata = (struct davinci_mcasp_pdata*) match->data;
+		pdata = devm_kmemdup(&pdev->dev, match->data, sizeof(*pdata),
+				     GFP_KERNEL);
+		if (!pdata) {
+			dev_err(&pdev->dev,
+				"Failed to allocate memory for pdata\n");
+			ret = -ENOMEM;
+			return pdata;
+		}
 	} else {
 		/* control shouldn't reach here. something is wrong */
 		ret = -EINVAL;
-- 
2.8.3