rtc: at91sam9: properly handle error case

In case of a probe error, it is possible to abort after issuing
clk_prepare_enable(). Ensure the clock is disabled and unprepared in that
case.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 5ccaee32df72..152cd816cc43 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -451,8 +451,10 @@ static int at91_rtc_probe(struct platform_device *pdev)
 
         rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
                                         &at91_rtc_ops, THIS_MODULE);
-        if (IS_ERR(rtc->rtcdev))
-                return PTR_ERR(rtc->rtcdev);
+        if (IS_ERR(rtc->rtcdev)) {
+                ret = PTR_ERR(rtc->rtcdev);
+                goto err_clk;
+        }
 
         /* register irq handler after we know what name we'll use */
         ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
@@ -460,7 +462,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
                                dev_name(&rtc->rtcdev->dev), rtc);
         if (ret) {
                 dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
-                return ret;
+                goto err_clk;
         }
 
         /* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
@@ -474,6 +476,11 @@ static int at91_rtc_probe(struct platform_device *pdev)
                                 dev_name(&rtc->rtcdev->dev));
 
         return 0;
+
+err_clk:
+        clk_disable_unprepare(rtc->sclk);
+
+        return ret;
 }
 
 /*