[PATCH] clocksource: clps711x: Fix resource leaks in error paths

[Zhen Ni <zhen.ni@easystack.cn>]

The current implementation of clps711x_timer_init() has multiple error
paths that directly return without releasing the base I/O memory mapped
via of_iomap(). This leads to resource leaks when:
1. irq_of_parse_and_map() fails
2. of_clk_get() returns an error
3. _clps711x_clkevt_init() fails for CLOCKEVENT alias
4. An unrecognized timer alias is provided

Signed-off-by: Zhen Ni <zhen.ni@easystack.cn>
---
 drivers/clocksource/clps711x-timer.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/clocksource/clps711x-timer.c b/drivers/clocksource/clps711x-timer.c
index e95fdc49c226..f803d694c7a4 100644
--- a/drivers/clocksource/clps711x-timer.c
+++ b/drivers/clocksource/clps711x-timer.c
@@ -78,24 +78,34 @@ static int __init clps711x_timer_init(struct device_node *np)
 	unsigned int irq = irq_of_parse_and_map(np, 0);
 	struct clk *clock = of_clk_get(np, 0);
 	void __iomem *base = of_iomap(np, 0);
+	int ret = 0;
 
 	if (!base)
 		return -ENOMEM;
-	if (!irq)
-		return -EINVAL;
-	if (IS_ERR(clock))
-		return PTR_ERR(clock);
+	if (!irq) {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (IS_ERR(clock)) {
+		ret = PTR_ERR(clock);
+		goto out;
+	}
 
 	switch (of_alias_get_id(np, "timer")) {
 	case CLPS711X_CLKSRC_CLOCKSOURCE:
 		clps711x_clksrc_init(clock, base);
 		break;
 	case CLPS711X_CLKSRC_CLOCKEVENT:
-		return _clps711x_clkevt_init(clock, base, irq);
+		ret =  _clps711x_clkevt_init(clock, base, irq);
+		break;
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
+		break;
 	}
 
-	return 0;
+out:
+	if (base)
+		iounmap(base);
+	return ret;
 }
 TIMER_OF_DECLARE(clps711x, "cirrus,ep7209-timer", clps711x_timer_init);
-- 
2.20.1