linux-kernel - [PATCH v3 3/5] driver core: platform: Add platform_put

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Date:   Thu, 26 Nov 2020 01:20:39 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <lenb@...nel.org>, <rjw@...ysocki.net>,
        <gregkh@...uxfoundation.org>, <tglx@...utronix.de>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <linux-acpi@...r.kernel.org>,
        <maz@...nel.org>, "John Garry" <john.garry@...wei.com>
Subject: [PATCH v3 3/5] driver core: platform: Add platform_put_irq()

Add a function to tear down the work which was done in platform_get_irq()
for when the device driver is done with the irq.

For ACPI companion devices the irq resource is set as disabled, as this
resource is configured from platform_get_irq()->acpi_irq_get() and requires
resetting.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/base/platform.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 88aef93eb4dd..3eeda3746701 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -289,6 +289,20 @@ int platform_irq_count(struct platform_device *dev)
 }
 EXPORT_SYMBOL_GPL(platform_irq_count);
 
+void platform_put_irq(struct platform_device *dev, unsigned int num)
+{
+	unsigned int virq = platform_get_irq(dev, num);
+
+	irq_dispose_mapping(virq);
+	if (has_acpi_companion(&dev->dev)) {
+		struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ,
+							   num);
+
+		if (r)
+			acpi_dev_irqresource_disabled(r, 0);
+	}
+}
+
 /**
  * platform_get_resource_byname - get a resource for a device by name
  * @dev: platform device
-- 
2.26.2