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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/uio/uio_pdrv_genirq.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * drivers/uio/uio_pdrv_genirq.c
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  *
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@@ -8,10 +9,6 @@
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  * Based on uio_pdrv.c by Uwe Kleine-Koenig,
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  * Copyright (C) 2008 by Digi International Inc.
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  * All rights reserved.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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  */
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13
 
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 #include <linux/platform_device.h>
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@@ -23,6 +20,7 @@
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 #include <linux/stringify.h>
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 #include <linux/pm_runtime.h>
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 #include <linux/slab.h>
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+#include <linux/irq.h>
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 #include <linux/of.h>
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 #include <linux/of_platform.h>
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@@ -102,15 +100,25 @@
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 	return 0;
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 }
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+static void uio_pdrv_genirq_cleanup(void *data)
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+{
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+	struct device *dev = data;
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+
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+	pm_runtime_disable(dev);
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+}
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+
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 static int uio_pdrv_genirq_probe(struct platform_device *pdev)
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 {
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 	struct uio_info *uioinfo = dev_get_platdata(&pdev->dev);
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+	struct device_node *node = pdev->dev.of_node;
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 	struct uio_pdrv_genirq_platdata *priv;
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 	struct uio_mem *uiomem;
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 	int ret = -EINVAL;
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 	int i;
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-	if (pdev->dev.of_node) {
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+	if (node) {
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+		const char *name;
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+
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 		/* alloc uioinfo for one device */
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 		uioinfo = devm_kzalloc(&pdev->dev, sizeof(*uioinfo),
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 				       GFP_KERNEL);
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@@ -118,7 +126,13 @@
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 			dev_err(&pdev->dev, "unable to kmalloc\n");
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 			return -ENOMEM;
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 		}
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-		uioinfo->name = pdev->dev.of_node->name;
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+
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+		if (!of_property_read_string(node, "linux,uio-name", &name))
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+			uioinfo->name = devm_kstrdup(&pdev->dev, name, GFP_KERNEL);
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+		else
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+			uioinfo->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
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+						       "%pOFn", node);
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+
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 		uioinfo->version = "devicetree";
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 		/* Multiple IRQs are not supported */
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 	}
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@@ -146,13 +160,32 @@
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 	priv->pdev = pdev;
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 	if (!uioinfo->irq) {
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-		ret = platform_get_irq(pdev, 0);
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+		ret = platform_get_irq_optional(pdev, 0);
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 		uioinfo->irq = ret;
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 		if (ret == -ENXIO)
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 			uioinfo->irq = UIO_IRQ_NONE;
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+		else if (ret == -EPROBE_DEFER)
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+			return ret;
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 		else if (ret < 0) {
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 			dev_err(&pdev->dev, "failed to get IRQ\n");
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 			return ret;
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+		}
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+	}
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+
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+	if (uioinfo->irq) {
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+		struct irq_data *irq_data = irq_get_irq_data(uioinfo->irq);
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+
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+		/*
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+		 * If a level interrupt, dont do lazy disable. Otherwise the
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+		 * irq will fire again since clearing of the actual cause, on
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+		 * device level, is done in userspace
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+		 * irqd_is_level_type() isn't used since isn't valid until
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+		 * irq is configured.
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+		 */
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+		if (irq_data &&
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+		    irqd_get_trigger_type(irq_data) & IRQ_TYPE_LEVEL_MASK) {
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+			dev_dbg(&pdev->dev, "disable lazy unmask\n");
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+			irq_set_status_flags(uioinfo->irq, IRQ_DISABLE_UNLAZY);
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 		}
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 	}
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@@ -172,8 +205,10 @@
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 		}
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 		uiomem->memtype = UIO_MEM_PHYS;
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-		uiomem->addr = r->start;
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-		uiomem->size = resource_size(r);
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+		uiomem->addr = r->start & PAGE_MASK;
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+		uiomem->offs = r->start & ~PAGE_MASK;
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+		uiomem->size = (uiomem->offs + resource_size(r)
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+				+ PAGE_SIZE - 1) & PAGE_MASK;
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 		uiomem->name = r->name;
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 		++uiomem;
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 	}
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@@ -205,28 +240,16 @@
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 	 */
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 	pm_runtime_enable(&pdev->dev);
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-	ret = uio_register_device(&pdev->dev, priv->uioinfo);
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-	if (ret) {
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-		dev_err(&pdev->dev, "unable to register uio device\n");
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-		pm_runtime_disable(&pdev->dev);
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+	ret = devm_add_action_or_reset(&pdev->dev, uio_pdrv_genirq_cleanup,
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+				       &pdev->dev);
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+	if (ret)
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 		return ret;
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-	}
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-	platform_set_drvdata(pdev, priv);
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-	return 0;
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-}
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+	ret = devm_uio_register_device(&pdev->dev, priv->uioinfo);
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+	if (ret)
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+		dev_err(&pdev->dev, "unable to register uio device\n");
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-static int uio_pdrv_genirq_remove(struct platform_device *pdev)
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-{
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-	struct uio_pdrv_genirq_platdata *priv = platform_get_drvdata(pdev);
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-
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-	uio_unregister_device(priv->uioinfo);
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-	pm_runtime_disable(&pdev->dev);
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-
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-	priv->uioinfo->handler = NULL;
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-	priv->uioinfo->irqcontrol = NULL;
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-
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-	return 0;
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+	return ret;
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 }
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 static int uio_pdrv_genirq_runtime_nop(struct device *dev)
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@@ -263,7 +286,6 @@
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 static struct platform_driver uio_pdrv_genirq = {
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 	.probe = uio_pdrv_genirq_probe,
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-	.remove = uio_pdrv_genirq_remove,
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 	.driver = {
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 		.name = DRIVER_NAME,
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 		.pm = &uio_pdrv_genirq_dev_pm_ops,