linux-kernel - [PATCH v3] driver core: platform: Add an error message to platform_get

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Message-Id: <20190102185106.56913-1-swboyd@chromium.org>
Date:   Wed,  2 Jan 2019 10:51:06 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     robh@...nel.org
Cc:     a.hajda@...sung.com, andy.shevchenko@...il.com,
        b.zolnierkie@...sung.com, broonie@...nel.org,
        gregkh@...uxfoundation.org, javierm@...hat.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux@...linux.org.uk, m.szyprowski@...sung.com, rafael@...nel.org
Subject: [PATCH v3] driver core: platform: Add an error message to platform_get_irq*()

A grep of the kernel shows that many drivers print an error message if
they fail to get the irq they're looking for. Furthermore, those drivers
all decide to print the device name, or not, and the irq they were
requesting, or not, etc. Let's consolidate all these error messages into
the API itself, allowing us to get rid of the error messages in each
driver.

Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---

Changes from v2:
 * Don't refactor platform_get_irq(), just wrap it

Changes from v1:
 * Update error text to indicate irq index instead of IRQn, use %u

 drivers/base/platform.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 1c958eb33ef4..388461306dd4 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -79,12 +79,7 @@ struct resource *platform_get_resource(struct platform_device *dev,
 }
 EXPORT_SYMBOL_GPL(platform_get_resource);
 
-/**
- * platform_get_irq - get an IRQ for a device
- * @dev: platform device
- * @num: IRQ number index
- */
-int platform_get_irq(struct platform_device *dev, unsigned int num)
+static int __platform_get_irq(struct platform_device *dev, unsigned int num)
 {
 #ifdef CONFIG_SPARC
 	/* sparc does not have irqs represented as IORESOURCE_IRQ resources */
@@ -130,6 +125,22 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
 	return r ? r->start : -ENXIO;
 #endif
 }
+
+/**
+ * platform_get_irq - get an IRQ for a device
+ * @dev: platform device
+ * @num: IRQ number index
+ */
+int platform_get_irq(struct platform_device *dev, unsigned int num)
+{
+	int ret;
+
+	ret = __platform_get_irq(dev, num);
+	if (ret < 0 && ret != -EPROBE_DEFER)
+		dev_err(&dev->dev, "IRQ index %u not found\n", num);
+
+	return ret;
+}
 EXPORT_SYMBOL_GPL(platform_get_irq);
 
 /**
@@ -142,7 +153,7 @@ int platform_irq_count(struct platform_device *dev)
 {
 	int ret, nr = 0;
 
-	while ((ret = platform_get_irq(dev, nr)) >= 0)
+	while ((ret = __platform_get_irq(dev, nr)) >= 0)
 		nr++;
 
 	if (ret == -EPROBE_DEFER)
@@ -195,7 +206,11 @@ int platform_get_irq_byname(struct platform_device *dev, const char *name)
 	}
 
 	r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
-	return r ? r->start : -ENXIO;
+	if (r)
+		return r->start;
+
+	dev_err(&dev->dev, "IRQ %s not found\n", name);
+	return -ENXIO;
 }
 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
 
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