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Date: Fri, 16 Jan 2015 10:49:36 -0800
From: Mandeep Sandhu <mandeep.sandhu@...ninc.com>
To: hjk@...sjkoch.de, gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
linux-fsdevel@...r.kernel.org,
Mandeep Sandhu <mandeep.sandhu@...ninc.com>
Subject: [PATCH 1/4] uio: Simplify the lifetime logic of struct uio_device.
Embed struct device into struct uio_device, and use
the refcounting and the release method of struct device
to control struct uio_device.
This allows device_create and device_destroy to be replaced
with the more standard device_register and device_unregister,
and allows the struct device reference count to act as a
reference count on struct idev as well.
Tested-by: Mandeep Sandhu <mandeep.sandhu@...ninc.com>
Signed-off-by: Mandeep Sandhu <mandeep.sandhu@...ninc.com>
---
drivers/uio/uio.c | 41 ++++++++++++++++++++++++++---------------
include/linux/uio_driver.h | 3 ++-
2 files changed, 28 insertions(+), 16 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 6276f13..350b81b 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -16,7 +16,6 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/poll.h>
-#include <linux/device.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/idr.h>
@@ -270,7 +269,7 @@ static int uio_dev_add_attributes(struct uio_device *idev)
if (!map_found) {
map_found = 1;
idev->map_dir = kobject_create_and_add("maps",
- &idev->dev->kobj);
+ &idev->device.kobj);
if (!idev->map_dir)
goto err_map;
}
@@ -295,7 +294,7 @@ static int uio_dev_add_attributes(struct uio_device *idev)
if (!portio_found) {
portio_found = 1;
idev->portio_dir = kobject_create_and_add("portio",
- &idev->dev->kobj);
+ &idev->device.kobj);
if (!idev->portio_dir)
goto err_portio;
}
@@ -334,7 +333,7 @@ err_map_kobj:
kobject_put(&map->kobj);
}
kobject_put(idev->map_dir);
- dev_err(idev->dev, "error creating sysfs files (%d)\n", ret);
+ dev_err(&idev->device, "error creating sysfs files (%d)\n", ret);
return ret;
}
@@ -371,7 +370,7 @@ static int uio_get_minor(struct uio_device *idev)
idev->minor = retval;
retval = 0;
} else if (retval == -ENOSPC) {
- dev_err(idev->dev, "too many uio devices\n");
+ dev_err(&idev->device, "too many uio devices\n");
retval = -EINVAL;
}
mutex_unlock(&minor_lock);
@@ -785,6 +784,13 @@ static void release_uio_class(void)
uio_major_cleanup();
}
+static void uio_device_release(struct device *dev)
+{
+ struct uio_device *idev = dev_get_drvdata(dev);
+
+ devm_kfree(dev->parent, idev);
+}
+
/**
* uio_register_device - register a new userspace IO device
* @owner: module that creates the new device
@@ -819,14 +825,19 @@ int __uio_register_device(struct module *owner,
if (ret)
return ret;
- idev->dev = device_create(&uio_class, parent,
- MKDEV(uio_major, idev->minor), idev,
- "uio%d", idev->minor);
- if (IS_ERR(idev->dev)) {
- printk(KERN_ERR "UIO: device register failed\n");
- ret = PTR_ERR(idev->dev);
+ idev->device.devt = MKDEV(uio_major, idev->minor);
+ idev->device.class = &uio_class;
+ idev->device.parent = parent;
+ idev->device.release = uio_device_release;
+ dev_set_drvdata(&idev->device, idev);
+
+ ret = kobject_set_name(&idev->device.kobj, "uio%d", idev->minor);
+ if (ret)
+ goto err_device_create;
+
+ ret = device_register(&idev->device);
+ if (ret)
goto err_device_create;
- }
ret = uio_dev_add_attributes(idev);
if (ret)
@@ -835,7 +846,7 @@ int __uio_register_device(struct module *owner,
info->uio_dev = idev;
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
- ret = devm_request_irq(idev->dev, info->irq, uio_interrupt,
+ ret = devm_request_irq(&idev->device, info->irq, uio_interrupt,
info->irq_flags, info->name, idev);
if (ret)
goto err_request_irq;
@@ -846,7 +857,7 @@ int __uio_register_device(struct module *owner,
err_request_irq:
uio_dev_del_attributes(idev);
err_uio_dev_add_attributes:
- device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
+ device_unregister(&idev->device);
err_device_create:
uio_free_minor(idev);
return ret;
@@ -871,7 +882,7 @@ void uio_unregister_device(struct uio_info *info)
uio_dev_del_attributes(idev);
- device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
+ device_unregister(&idev->device);
return;
}
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index 32c0e83..e8f7f82 100644
--- a/include/linux/uio_driver.h
+++ b/include/linux/uio_driver.h
@@ -14,6 +14,7 @@
#ifndef _UIO_DRIVER_H_
#define _UIO_DRIVER_H_
+#include <linux/device.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
@@ -65,7 +66,7 @@ struct uio_port {
struct uio_device {
struct module *owner;
- struct device *dev;
+ struct device device;
int minor;
atomic_t event;
struct fasync_struct *async_queue;
--
1.9.1
--
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