linux-kernel - [PATCH v3 06/15] platform: goldfish: pipe: Move memory allocation from probe to init

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Message-Id: <20181003171720.169953-6-rkir@google.com>
Date:   Wed,  3 Oct 2018 10:17:11 -0700
From:   rkir@...gle.com
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, tkjos@...gle.com,
        Roman Kiryanov <rkir@...gle.com>
Subject: [PATCH v3 06/15] platform: goldfish: pipe: Move memory allocation
 from probe to init

From: Roman Kiryanov <rkir@...gle.com>

There will be two separate init functions for v1 and v2
(different driver versions) and they will allocate different
state.

Signed-off-by: Roman Kiryanov <rkir@...gle.com>
---
Changes in v3:
 - No change.
Changes in v2:
 - No change.

 drivers/platform/goldfish/goldfish_pipe.c | 42 +++++++++++++----------
 1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index bc431f04c4cf..445c0c0c66c4 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -208,8 +208,6 @@ struct goldfish_pipe_dev {
 	struct device *pdev_dev;
 
 	/* Some device-specific data */
-	int irq;
-	int version;
 	unsigned char __iomem *base;
 
 	/* an irq tasklet to run goldfish_interrupt_task */
@@ -817,14 +815,23 @@ static void write_pa_addr(void *addr, void __iomem *portl, void __iomem *porth)
 }
 
 static int goldfish_pipe_device_init(struct platform_device *pdev,
-				     struct goldfish_pipe_dev *dev)
+				     char __iomem *base,
+				     int irq)
 {
+	struct goldfish_pipe_dev *dev;
 	int err;
 
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->magic = &goldfish_pipe_device_deinit;
+	spin_lock_init(&dev->lock);
+
 	tasklet_init(&dev->irq_tasklet, &goldfish_interrupt_task,
 		     (unsigned long)dev);
 
-	err = devm_request_irq(&pdev->dev, dev->irq,
+	err = devm_request_irq(&pdev->dev, irq,
 			       goldfish_pipe_interrupt,
 			       IRQF_SHARED, "goldfish_pipe", dev);
 	if (err) {
@@ -839,6 +846,7 @@ static int goldfish_pipe_device_init(struct platform_device *pdev,
 		return err;
 	}
 
+	dev->base = base;
 	dev->pdev_dev = &pdev->dev;
 	dev->first_signalled_pipe = NULL;
 	dev->pipes_capacity = INITIAL_PIPES_CAPACITY;
@@ -892,22 +900,18 @@ static void goldfish_pipe_device_deinit(struct platform_device *pdev,
 static int goldfish_pipe_probe(struct platform_device *pdev)
 {
 	struct resource *r;
-	struct goldfish_pipe_dev *dev;
-
-	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
-	if (!dev)
-		return -ENOMEM;
-
-	dev->magic = &goldfish_pipe_device_deinit;
-	spin_lock_init(&dev->lock);
+	char __iomem *base;
+	int irq;
+	int version;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r || resource_size(r) < PAGE_SIZE) {
 		dev_err(&pdev->dev, "can't allocate i/o page\n");
 		return -EINVAL;
 	}
-	dev->base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
-	if (!dev->base) {
+
+	base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
+	if (!base) {
 		dev_err(&pdev->dev, "ioremap failed\n");
 		return -EINVAL;
 	}
@@ -916,7 +920,7 @@ static int goldfish_pipe_probe(struct platform_device *pdev)
 	if (!r)
 		return -EINVAL;
 
-	dev->irq = r->start;
+	irq = r->start;
 
 	/*
 	 * Exchange the versions with the host device
@@ -925,12 +929,12 @@ static int goldfish_pipe_probe(struct platform_device *pdev)
 	 *  reading device version back: this allows the host implementation to
 	 *  detect the old driver (if there was no version write before read).
 	 */
-	writel(PIPE_DRIVER_VERSION, dev->base + PIPE_REG_VERSION);
-	dev->version = readl(dev->base + PIPE_REG_VERSION);
-	if (WARN_ON(dev->version < PIPE_CURRENT_DEVICE_VERSION))
+	writel(PIPE_DRIVER_VERSION, base + PIPE_REG_VERSION);
+	version = readl(base + PIPE_REG_VERSION);
+	if (WARN_ON(version < PIPE_CURRENT_DEVICE_VERSION))
 		return -EINVAL;
 
-	return goldfish_pipe_device_init(pdev, dev);
+	return goldfish_pipe_device_init(pdev, base, irq);
 }
 
 static int goldfish_pipe_remove(struct platform_device *pdev)
-- 
2.19.0.605.g01d371f741-goog