linux-kernel - [PATCH AUTOSEL for 4.9 074/100] rtc: pl031: make interrupt optional

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Message-ID: <20171213015722.6722-49-alexander.levin@verizon.com>
Date:   Wed, 13 Dec 2017 01:57:41 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 074/100] rtc: pl031: make interrupt optional

From: Russell King <rmk+kernel@...linux.org.uk>

[ Upstream commit 5b64a2965dfdfca8039e93303c64e2b15c19ff0c ]

On some platforms, the interrupt for the PL031 is optional.  Avoid
trying to claim the interrupt if it's not specified.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/rtc/rtc-pl031.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
index e1687e19c59f..a30f24cb6c83 100644
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -308,7 +308,8 @@ static int pl031_remove(struct amba_device *adev)
 
 	dev_pm_clear_wake_irq(&adev->dev);
 	device_init_wakeup(&adev->dev, false);
-	free_irq(adev->irq[0], ldata);
+	if (adev->irq[0])
+		free_irq(adev->irq[0], ldata);
 	rtc_device_unregister(ldata->rtc);
 	iounmap(ldata->base);
 	kfree(ldata);
@@ -381,12 +382,13 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
 		goto out_no_rtc;
 	}
 
-	if (request_irq(adev->irq[0], pl031_interrupt,
-			vendor->irqflags, "rtc-pl031", ldata)) {
-		ret = -EIO;
-		goto out_no_irq;
+	if (adev->irq[0]) {
+		ret = request_irq(adev->irq[0], pl031_interrupt,
+				  vendor->irqflags, "rtc-pl031", ldata);
+		if (ret)
+			goto out_no_irq;
+		dev_pm_set_wake_irq(&adev->dev, adev->irq[0]);
 	}
-	dev_pm_set_wake_irq(&adev->dev, adev->irq[0]);
 	return 0;
 
 out_no_irq:
-- 
2.11.0