# \[PATCH V2 1/2\] Input: at32psif: handle clk\_enable return value

- From: WEN Pingbo \<hidden\>
- Date: 2015-09-11 03:35:39 
- List: linux-input
- Page: https://ratatoskr.run/linux-input/2015/09/8926800
- Thread: https://ratatoskr.run/linux-input/2015/09/8926797/t.md

```text
We should print the err if clk_enable failed.

Signed-off-by: WEN Pingbo <redacted>
---
 drivers/input/serio/at32psif.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/input/serio/at32psif.c b/drivers/input/serio/at32psif.c
index 2e4ff5b..38862a8 100644
--- a/drivers/input/serio/at32psif.c
+++ b/drivers/input/serio/at32psif.c
@@ -185,6 +185,7 @@ static void psif_set_prescaler(struct psif *psif)
 {
 	unsigned long prscv;
 	unsigned long rate = clk_get_rate(psif->pclk);
+	int retval;
 
 	/* PRSCV = Pulse length (100 us) * PSIF module frequency. */
 	prscv = 100 * (rate / 1000000UL);
@@ -195,7 +196,12 @@ static void psif_set_prescaler(struct psif *psif)
 				"prescaler set to max\n");
 	}
 
-	clk_enable(psif->pclk);
+	retval = clk_enable(psif->pclk);
+	if (retval < 0) {
+		dev_err(&psif->pdev->dev,
+			"could not enable pclk, ret %d\n", retval);
+		return;
+	}
 	psif_writel(psif, PSR, prscv);
 	clk_disable(psif->pclk);
 }
-- 
1.9.1

```