[PATCH -next] clocksource: cadence_ttc: Fix error handling in ttc_setup_clockevent()

[weiyj_lk]

From: Wei Yongjun <yongjun_...@trendmicro.com.cn>

resources alloc in this function should be release in the error
handling, otherwise it will cause resource leak.

Signed-off-by: Wei Yongjun <yongjun_...@trendmicro.com.cn>
---
 drivers/clocksource/cadence_ttc_timer.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/cadence_ttc_timer.c 
b/drivers/clocksource/cadence_ttc_timer.c
index fbfbdec..020b85c 100644
--- a/drivers/clocksource/cadence_ttc_timer.c
+++ b/drivers/clocksource/cadence_ttc_timer.c
@@ -418,10 +418,8 @@ static int __init ttc_setup_clockevent(struct clk *clk,
        ttcce->ttc.clk = clk;
 
        err = clk_prepare_enable(ttcce->ttc.clk);
-       if (err) {
-               kfree(ttcce);
-               return err;
-       }
+       if (err)
+               goto err_clk;
 
        ttcce->ttc.clk_rate_change_nb.notifier_call =
                ttc_rate_change_clockevent_cb;
@@ -431,7 +429,7 @@ static int __init ttc_setup_clockevent(struct clk *clk,
                                    &ttcce->ttc.clk_rate_change_nb);
        if (err) {
                pr_warn("Unable to register clock notifier.\n");
-               return err;
+               goto err_reg;
        }
 
        ttcce->ttc.freq = clk_get_rate(ttcce->ttc.clk);
@@ -460,15 +458,21 @@ static int __init ttc_setup_clockevent(struct clk *clk,
 
        err = request_irq(irq, ttc_clock_event_interrupt,
                          IRQF_TIMER, ttcce->ce.name, ttcce);
-       if (err) {
-               kfree(ttcce);
-               return err;
-       }
+       if (err)
+               goto err_irq;
 
        clockevents_config_and_register(&ttcce->ce,
                        ttcce->ttc.freq / PRESCALE, 1, 0xfffe);
 
        return 0;
+err_irq:
+       clk_notifier_unregister(ttcce->ttc.clk,
+                               &ttcce->ttc.clk_rate_change_nb);
+err_reg:
+       clk_disable_unprepare(ttcce->ttc.clk);
+err_clk:
+       kfree(ttcce);
+       return err;
 }
 
 /**