[PATCH v4] clocksource/timer-imx-gpt: Prevent resource leake in error path.

[Arvind Yadav <arvind.yadav.cs@gmail.com>]

-Free previously allocated memory.
-Unmap I/O memory from kernel address space.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/clocksource/timer-imx-gpt.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/clocksource/timer-imx-gpt.c b/drivers/clocksource/timer-imx-gpt.c
index f595460..022dfdf 100644
--- a/drivers/clocksource/timer-imx-gpt.c
+++ b/drivers/clocksource/timer-imx-gpt.c
@@ -489,12 +489,16 @@ static int __init mxc_timer_init_dt(struct device_node *np,  enum imx_gpt_type t
 		return -ENOMEM;
 
 	imxtm->base = of_iomap(np, 0);
-	if (!imxtm->base)
-		return -ENXIO;
+	if (!imxtm->base) {
+		ret = -ENXIO;
+		goto error_free;
+	}
 
 	imxtm->irq = irq_of_parse_and_map(np, 0);
-	if (imxtm->irq <= 0)
-		return -EINVAL;
+	if (imxtm->irq <= 0) {
+		ret = -EINVAL;
+		goto error_iounmap;
+	}
 
 	imxtm->clk_ipg = of_clk_get_by_name(np, "ipg");
 
@@ -507,11 +511,17 @@ static int __init mxc_timer_init_dt(struct device_node *np,  enum imx_gpt_type t
 
 	ret = _mxc_timer_init(imxtm);
 	if (ret)
-		return ret;
+		goto error_iounmap;
 
 	initialized = 1;
 
 	return 0;
+
+error_iounmap:
+	iounmap(imxtm->base);
+error_free:
+	kfree(imxtm);
+	return ret;
 }
 
 static int __init imx1_timer_init_dt(struct device_node *np)
-- 
2.7.4