linux-kernel - [PATCH 3.16 050/133] rtc: sa1100: fix unbalanced clk_prepare_enable/clk_disable

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Date:   Wed, 22 Nov 2017 01:58:13 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Alexandre Belloni" <alexandre.belloni@...e-electrons.com>,
        "Robert Jarzmik" <robert.jarzmik@...e.fr>
Subject: [PATCH 3.16 050/133] rtc: sa1100: fix unbalanced clk_prepare_enable/clk_disable_unprepare

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

commit 1cf85b2327a9b03bde5266e72ee64a38d085256d upstream.

In the error path of sa1100_rtc_open(), info->clk is disabled which will
happen again in sa1100_rtc_remove() when the module is removed whereas it
is only enabled once in sa1100_rtc_init().

Fixes: 0cc0c38e9139 ("drivers/rtc/rtc-sa1100.c: move clock enable/disable to probe/remove")
Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/rtc/rtc-sa1100.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -111,7 +111,7 @@ static int sa1100_rtc_open(struct device
 	ret = request_irq(info->irq_1hz, sa1100_rtc_interrupt, 0, "rtc 1Hz", dev);
 	if (ret) {
 		dev_err(dev, "IRQ %d already in use.\n", info->irq_1hz);
-		goto fail_ui;
+		return ret;
 	}
 	ret = request_irq(info->irq_alarm, sa1100_rtc_interrupt, 0, "rtc Alrm", dev);
 	if (ret) {
@@ -125,8 +125,6 @@ static int sa1100_rtc_open(struct device
 
  fail_ai:
 	free_irq(info->irq_1hz, dev);
- fail_ui:
-	clk_disable_unprepare(info->clk);
 	return ret;
 }