[PATCH] clocksource/drivers/moxart: fix memory leak on timer on error exit paths

From: Colin King
Date: Thu Nov 24 2016 - 10:16:35 EST


From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

The timer is not being free'd on the error exit paths, causing a small
memory leak. Add an err exit path that free's timer and returns the
error status in ret.

Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
drivers/clocksource/moxart_timer.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/clocksource/moxart_timer.c b/drivers/clocksource/moxart_timer.c
index 2a8f470..65e04a6 100644
--- a/drivers/clocksource/moxart_timer.c
+++ b/drivers/clocksource/moxart_timer.c
@@ -161,19 +161,22 @@ static int __init moxart_timer_init(struct device_node *node)
timer->base = of_iomap(node, 0);
if (!timer->base) {
pr_err("%s: of_iomap failed\n", node->full_name);
- return -ENXIO;
+ ret = -ENXIO;
+ goto err;
}

irq = irq_of_parse_and_map(node, 0);
if (irq <= 0) {
pr_err("%s: irq_of_parse_and_map failed\n", node->full_name);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err;
}

clk = of_clk_get(node, 0);
if (IS_ERR(clk)) {
pr_err("%s: of_clk_get failed\n", node->full_name);
- return PTR_ERR(clk);
+ ret = PTR_ERR(clk);
+ goto err;
}

pclk = clk_get_rate(clk);
@@ -186,7 +189,8 @@ static int __init moxart_timer_init(struct device_node *node)
timer->t1_disable_val = ASPEED_TIMER1_DISABLE;
} else {
pr_err("%s: unknown platform\n", node->full_name);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err;
}

timer->count_per_tick = DIV_ROUND_CLOSEST(pclk, HZ);
@@ -208,14 +212,14 @@ static int __init moxart_timer_init(struct device_node *node)
clocksource_mmio_readl_down);
if (ret) {
pr_err("%s: clocksource_mmio_init failed\n", node->full_name);
- return ret;
+ goto err;
}

ret = request_irq(irq, moxart_timer_interrupt, IRQF_TIMER,
node->name, &timer->clkevt);
if (ret) {
pr_err("%s: setup_irq failed\n", node->full_name);
- return ret;
+ goto err;
}

/* Clear match registers */
@@ -241,6 +245,9 @@ static int __init moxart_timer_init(struct device_node *node)
clockevents_config_and_register(&timer->clkevt, pclk, 0x4, 0xfffffffe);

return 0;
+err:
+ kfree(timer);
+ return ret;
}
CLOCKSOURCE_OF_DECLARE(moxart, "moxa,moxart-timer", moxart_timer_init);
CLOCKSOURCE_OF_DECLARE(aspeed, "aspeed,ast2400-timer", moxart_timer_init);
--
2.10.2