linux-kernel - [PATCH 17/21] rtc-mpc5121: use devm_irq_of_parse_and

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Date:	Wed,  4 Jun 2014 15:13:17 +0400
From:	nyushchenko@....rtsoft.ru
To:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	devicetree@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, lugovskoy@....rtsoft.ru,
	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
Subject: [PATCH 17/21] rtc-mpc5121: use devm_irq_of_parse_and_map()

From: Nikita Yushchenko <nyushchenko@....rtsoft.ru>

This avoids leak of IRQ mapping on error paths, and makes it possible
to use devm_request_irq() without facing unmap-while-handler-installed
issues.

Signed-off-by: Nikita Yushchenko <nyushchenko@....rtsoft.ru>
---
 drivers/rtc/rtc-mpc5121.c |   38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/rtc/rtc-mpc5121.c b/drivers/rtc/rtc-mpc5121.c
index dc4f142..c62e5eb 100644
--- a/drivers/rtc/rtc-mpc5121.c
+++ b/drivers/rtc/rtc-mpc5121.c
@@ -328,22 +328,34 @@ static int mpc5121_rtc_probe(struct platform_device *op)
 
 	platform_set_drvdata(op, rtc);
 
-	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
-	err = request_irq(rtc->irq, mpc5121_rtc_handler, 0,
+	rtc->irq = devm_irq_of_parse_and_map(&op->dev, op->dev.of_node, 1);
+	if (rtc->irq <= 0) {
+		dev_err(&op->dev, "%s: could not locate irq\n", __func__);
+		err = rtc->irq ? rtc->irq : -EINVAL;
+		goto out;
+	}
+	err = devm_request_irq(&op->dev, rtc->irq, mpc5121_rtc_handler, 0,
 						"mpc5121-rtc", &op->dev);
 	if (err) {
 		dev_err(&op->dev, "%s: could not request irq: %i\n",
 							__func__, rtc->irq);
-		goto out_dispose;
+		goto out;
 	}
 
-	rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
-	err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
+	rtc->irq_periodic = devm_irq_of_parse_and_map(&op->dev,
+				op->dev.of_node, 0);
+	if (rtc->irq_periodic <= 0) {
+		dev_err(&op->dev, "%s: could not locate irq\n", __func__);
+		err = rtc->irq_periodic ? rtc->irq_periodic : -EINVAL;
+		goto out;
+	}
+	err = devm_request_irq(&op->dev, rtc->irq_periodic,
+				mpc5121_rtc_handler_upd,
 				0, "mpc5121-rtc_upd", &op->dev);
 	if (err) {
 		dev_err(&op->dev, "%s: could not request irq: %i\n",
 						__func__, rtc->irq_periodic);
-		goto out_dispose2;
+		goto out;
 	}
 
 	if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
@@ -364,19 +376,13 @@ static int mpc5121_rtc_probe(struct platform_device *op)
 
 	if (IS_ERR(rtc->rtc)) {
 		err = PTR_ERR(rtc->rtc);
-		goto out_free_irq;
+		goto out;
 	}
 	rtc->rtc->uie_unsupported = 1;
 
 	return 0;
 
-out_free_irq:
-	free_irq(rtc->irq_periodic, &op->dev);
-out_dispose2:
-	irq_dispose_mapping(rtc->irq_periodic);
-	free_irq(rtc->irq, &op->dev);
-out_dispose:
-	irq_dispose_mapping(rtc->irq);
+out:
 	iounmap(rtc->regs);
 
 	return err;
@@ -392,10 +398,6 @@ static int mpc5121_rtc_remove(struct platform_device *op)
 	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);
 
 	iounmap(rtc->regs);
-	free_irq(rtc->irq, &op->dev);
-	free_irq(rtc->irq_periodic, &op->dev);
-	irq_dispose_mapping(rtc->irq);
-	irq_dispose_mapping(rtc->irq_periodic);
 
 	return 0;
 }
-- 
1.7.10.4

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