linux-kernel - [PATCH 08/21] platform: goldfish: pipe: Remove the goldfish_pipe

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Message-Id: <20180914175122.21036-8-rkir@google.com>
Date:   Fri, 14 Sep 2018 10:51:09 -0700
From:   rkir@...gle.com
To:     gregkh@...uxfoundation.org
Cc:     tkjos@...gle.com, linux-kernel@...r.kernel.org,
        Roman Kiryanov <rkir@...gle.com>
Subject: [PATCH 08/21] platform: goldfish: pipe: Remove the
 goldfish_pipe_miscdev global variable

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

This is a series of patches to remove mutable global variables
to introduce another version of the pipe driver for the older
host interface. I don't want to have two driver states where
only one is used.

Signed-off-by: Roman Kiryanov <rkir@...gle.com>
---
 drivers/platform/goldfish/goldfish_pipe.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index 8a5ce7c01f11..53832e46ad1a 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -245,6 +245,8 @@ struct goldfish_pipe_dev {
 	/* an irq tasklet to run goldfish_interrupt_task */
 	struct tasklet_struct irq_tasklet;
 
+	struct miscdevice miscdev;
+
 	/* DMA info */
 	size_t dma_alloc_total;
 };
@@ -1093,11 +1095,14 @@ static const struct file_operations goldfish_pipe_fops = {
 	.compat_ioctl = goldfish_dma_ioctl,
 };
 
-static struct miscdevice goldfish_pipe_miscdev = {
-	.minor = MISC_DYNAMIC_MINOR,
-	.name = "goldfish_pipe",
-	.fops = &goldfish_pipe_fops,
-};
+static void init_miscdevice(struct miscdevice *miscdev)
+{
+	memset(miscdev, 0, sizeof(*miscdev));
+
+	miscdev->minor = MISC_DYNAMIC_MINOR;
+	miscdev->name = "goldfish_pipe";
+	miscdev->fops = &goldfish_pipe_fops;
+}
 
 static void write_pa_addr(void *addr, void __iomem *portl, void __iomem *porth)
 {
@@ -1123,7 +1128,8 @@ static int goldfish_pipe_device_init(struct platform_device *pdev)
 		return err;
 	}
 
-	err = misc_register(&goldfish_pipe_miscdev);
+	init_miscdevice(&dev->miscdev);
+	err = misc_register(&dev->miscdev);
 	if (err) {
 		dev_err(&pdev->dev, "unable to register v2 device\n");
 		return err;
@@ -1168,7 +1174,7 @@ static int goldfish_pipe_device_init(struct platform_device *pdev)
 
 static void goldfish_pipe_device_deinit(struct platform_device *pdev)
 {
-	misc_deregister(&goldfish_pipe_miscdev);
+	misc_deregister(&goldfish_pipe_dev.miscdev);
 	tasklet_kill(&goldfish_pipe_dev.irq_tasklet);
 	kfree(goldfish_pipe_dev.pipes);
 	free_page((unsigned long)goldfish_pipe_dev.buffers);
-- 
2.19.0.397.gdd90340f6a-goog