[PATCH] ASoC: ti: davinci-mcasp: Fix runtime PM imbalance in __davinci_mcasp_set_clkdiv()

[Wentao Liang <vulab@iscas.ac.cn>]

In __davinci_mcasp_set_clkdiv(), pm_runtime_get_sync() is called at the
entry of the function. If an invalid div_id is provided, the function
hits the default switch case and directly returns -EINVAL without calling
pm_runtime_put(), resulting in a runtime PM reference leak.

Add pm_runtime_put() in the default case before returning -EINVAL.

Fixes: 4ed8c9b737b6 ("ASoC: McASP: add support for clock dividers")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 sound/soc/ti/davinci-mcasp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/ti/davinci-mcasp.c b/sound/soc/ti/davinci-mcasp.c
index f229f847eaf4..1ec42fe02fc8 100644
--- a/sound/soc/ti/davinci-mcasp.c
+++ b/sound/soc/ti/davinci-mcasp.c
@@ -786,6 +786,7 @@ static int __davinci_mcasp_set_clkdiv(struct davinci_mcasp *mcasp, int div_id,
 		break;
 
 	default:
+		pm_runtime_put(mcasp->dev);
 		return -EINVAL;
 	}
 
-- 
2.34.1