From 163f1e93e995048b894c5fc86a6034d16beed740 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 23 Mar 2016 11:22:57 -0300 Subject: [PATCH] [media] media-devnode: fix namespace mess Along all media controller code, "mdev" is used to represent a pointer to struct media_device, and "devnode" for a pointer to struct media_devnode. However, inside media-devnode.[ch], "mdev" is used to represent a pointer to struct media_devnode. This is very confusing and may lead to development errors. So, let's change all occurrences at media-devnode.[ch] to also use "devnode" for such pointers. This patch doesn't make any functional changes. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Mauro Carvalho Chehab --- drivers/media/media-devnode.c | 110 +++++++++++++++++----------------- include/media/media-devnode.h | 16 ++--- 2 files changed, 63 insertions(+), 63 deletions(-) diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c index b66dc9d0766b..7481c9610945 100644 --- a/drivers/media/media-devnode.c +++ b/drivers/media/media-devnode.c @@ -59,21 +59,21 @@ static DECLARE_BITMAP(media_devnode_nums, MEDIA_NUM_DEVICES); /* Called when the last user of the media device exits. */ static void media_devnode_release(struct device *cd) { - struct media_devnode *mdev = to_media_devnode(cd); + struct media_devnode *devnode = to_media_devnode(cd); mutex_lock(&media_devnode_lock); /* Delete the cdev on this minor as well */ - cdev_del(&mdev->cdev); + cdev_del(&devnode->cdev); /* Mark device node number as free */ - clear_bit(mdev->minor, media_devnode_nums); + clear_bit(devnode->minor, media_devnode_nums); mutex_unlock(&media_devnode_lock); /* Release media_devnode and perform other cleanups as needed. */ - if (mdev->release) - mdev->release(mdev); + if (devnode->release) + devnode->release(devnode); } static struct bus_type media_bus_type = { @@ -83,37 +83,37 @@ static struct bus_type media_bus_type = { static ssize_t media_read(struct file *filp, char __user *buf, size_t sz, loff_t *off) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); - if (!mdev->fops->read) + if (!devnode->fops->read) return -EINVAL; - if (!media_devnode_is_registered(mdev)) + if (!media_devnode_is_registered(devnode)) return -EIO; - return mdev->fops->read(filp, buf, sz, off); + return devnode->fops->read(filp, buf, sz, off); } static ssize_t media_write(struct file *filp, const char __user *buf, size_t sz, loff_t *off) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); - if (!mdev->fops->write) + if (!devnode->fops->write) return -EINVAL; - if (!media_devnode_is_registered(mdev)) + if (!media_devnode_is_registered(devnode)) return -EIO; - return mdev->fops->write(filp, buf, sz, off); + return devnode->fops->write(filp, buf, sz, off); } static unsigned int media_poll(struct file *filp, struct poll_table_struct *poll) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); - if (!media_devnode_is_registered(mdev)) + if (!media_devnode_is_registered(devnode)) return POLLERR | POLLHUP; - if (!mdev->fops->poll) + if (!devnode->fops->poll) return DEFAULT_POLLMASK; - return mdev->fops->poll(filp, poll); + return devnode->fops->poll(filp, poll); } static long @@ -121,12 +121,12 @@ __media_ioctl(struct file *filp, unsigned int cmd, unsigned long arg, long (*ioctl_func)(struct file *filp, unsigned int cmd, unsigned long arg)) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); if (!ioctl_func) return -ENOTTY; - if (!media_devnode_is_registered(mdev)) + if (!media_devnode_is_registered(devnode)) return -EIO; return ioctl_func(filp, cmd, arg); @@ -134,9 +134,9 @@ __media_ioctl(struct file *filp, unsigned int cmd, unsigned long arg, static long media_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); - return __media_ioctl(filp, cmd, arg, mdev->fops->ioctl); + return __media_ioctl(filp, cmd, arg, devnode->fops->ioctl); } #ifdef CONFIG_COMPAT @@ -144,9 +144,9 @@ static long media_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) static long media_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); - return __media_ioctl(filp, cmd, arg, mdev->fops->compat_ioctl); + return __media_ioctl(filp, cmd, arg, devnode->fops->compat_ioctl); } #endif /* CONFIG_COMPAT */ @@ -154,7 +154,7 @@ static long media_compat_ioctl(struct file *filp, unsigned int cmd, /* Override for the open function */ static int media_open(struct inode *inode, struct file *filp) { - struct media_devnode *mdev; + struct media_devnode *devnode; int ret; /* Check if the media device is available. This needs to be done with @@ -164,23 +164,23 @@ static int media_open(struct inode *inode, struct file *filp) * a crash. */ mutex_lock(&media_devnode_lock); - mdev = container_of(inode->i_cdev, struct media_devnode, cdev); + devnode = container_of(inode->i_cdev, struct media_devnode, cdev); /* return ENXIO if the media device has been removed already or if it is not registered anymore. */ - if (!media_devnode_is_registered(mdev)) { + if (!media_devnode_is_registered(devnode)) { mutex_unlock(&media_devnode_lock); return -ENXIO; } /* and increase the device refcount */ - get_device(&mdev->dev); + get_device(&devnode->dev); mutex_unlock(&media_devnode_lock); - filp->private_data = mdev; + filp->private_data = devnode; - if (mdev->fops->open) { - ret = mdev->fops->open(filp); + if (devnode->fops->open) { + ret = devnode->fops->open(filp); if (ret) { - put_device(&mdev->dev); + put_device(&devnode->dev); filp->private_data = NULL; return ret; } @@ -192,16 +192,16 @@ static int media_open(struct inode *inode, struct file *filp) /* Override for the release function */ static int media_release(struct inode *inode, struct file *filp) { - struct media_devnode *mdev = media_devnode_data(filp); + struct media_devnode *devnode = media_devnode_data(filp); - if (mdev->fops->release) - mdev->fops->release(filp); + if (devnode->fops->release) + devnode->fops->release(filp); filp->private_data = NULL; /* decrease the refcount unconditionally since the release() return value is ignored. */ - put_device(&mdev->dev); + put_device(&devnode->dev); return 0; } @@ -219,7 +219,7 @@ static const struct file_operations media_devnode_fops = { .llseek = no_llseek, }; -int __must_check media_devnode_register(struct media_devnode *mdev, +int __must_check media_devnode_register(struct media_devnode *devnode, struct module *owner) { int minor; @@ -237,55 +237,55 @@ int __must_check media_devnode_register(struct media_devnode *mdev, set_bit(minor, media_devnode_nums); mutex_unlock(&media_devnode_lock); - mdev->minor = minor; + devnode->minor = minor; /* Part 2: Initialize and register the character device */ - cdev_init(&mdev->cdev, &media_devnode_fops); - mdev->cdev.owner = owner; + cdev_init(&devnode->cdev, &media_devnode_fops); + devnode->cdev.owner = owner; - ret = cdev_add(&mdev->cdev, MKDEV(MAJOR(media_dev_t), mdev->minor), 1); + ret = cdev_add(&devnode->cdev, MKDEV(MAJOR(media_dev_t), devnode->minor), 1); if (ret < 0) { pr_err("%s: cdev_add failed\n", __func__); goto error; } /* Part 3: Register the media device */ - mdev->dev.bus = &media_bus_type; - mdev->dev.devt = MKDEV(MAJOR(media_dev_t), mdev->minor); - mdev->dev.release = media_devnode_release; - if (mdev->parent) - mdev->dev.parent = mdev->parent; - dev_set_name(&mdev->dev, "media%d", mdev->minor); - ret = device_register(&mdev->dev); + devnode->dev.bus = &media_bus_type; + devnode->dev.devt = MKDEV(MAJOR(media_dev_t), devnode->minor); + devnode->dev.release = media_devnode_release; + if (devnode->parent) + devnode->dev.parent = devnode->parent; + dev_set_name(&devnode->dev, "media%d", devnode->minor); + ret = device_register(&devnode->dev); if (ret < 0) { pr_err("%s: device_register failed\n", __func__); goto error; } /* Part 4: Activate this minor. The char device can now be used. */ - set_bit(MEDIA_FLAG_REGISTERED, &mdev->flags); + set_bit(MEDIA_FLAG_REGISTERED, &devnode->flags); return 0; error: mutex_lock(&media_devnode_lock); - cdev_del(&mdev->cdev); - clear_bit(mdev->minor, media_devnode_nums); + cdev_del(&devnode->cdev); + clear_bit(devnode->minor, media_devnode_nums); mutex_unlock(&media_devnode_lock); return ret; } -void media_devnode_unregister(struct media_devnode *mdev) +void media_devnode_unregister(struct media_devnode *devnode) { - /* Check if mdev was ever registered at all */ - if (!media_devnode_is_registered(mdev)) + /* Check if devnode was ever registered at all */ + if (!media_devnode_is_registered(devnode)) return; mutex_lock(&media_devnode_lock); - clear_bit(MEDIA_FLAG_REGISTERED, &mdev->flags); + clear_bit(MEDIA_FLAG_REGISTERED, &devnode->flags); mutex_unlock(&media_devnode_lock); - device_unregister(&mdev->dev); + device_unregister(&devnode->dev); } /* diff --git a/include/media/media-devnode.h b/include/media/media-devnode.h index fe42f08e72bd..e1d5af077adb 100644 --- a/include/media/media-devnode.h +++ b/include/media/media-devnode.h @@ -94,7 +94,7 @@ struct media_devnode { unsigned long flags; /* Use bitops to access flags */ /* callbacks */ - void (*release)(struct media_devnode *mdev); + void (*release)(struct media_devnode *devnode); }; /* dev to media_devnode */ @@ -103,7 +103,7 @@ struct media_devnode { /** * media_devnode_register - register a media device node * - * @mdev: media device node structure we want to register + * @devnode: media device node structure we want to register * @owner: should be filled with %THIS_MODULE * * The registration code assigns minor numbers and registers the new device node @@ -116,12 +116,12 @@ struct media_devnode { * the media_devnode structure is *not* called, so the caller is responsible for * freeing any data. */ -int __must_check media_devnode_register(struct media_devnode *mdev, +int __must_check media_devnode_register(struct media_devnode *devnode, struct module *owner); /** * media_devnode_unregister - unregister a media device node - * @mdev: the device node to unregister + * @devnode: the device node to unregister * * This unregisters the passed device. Future open calls will be met with * errors. @@ -129,7 +129,7 @@ int __must_check media_devnode_register(struct media_devnode *mdev, * This function can safely be called if the device node has never been * registered or has already been unregistered. */ -void media_devnode_unregister(struct media_devnode *mdev); +void media_devnode_unregister(struct media_devnode *devnode); /** * media_devnode_data - returns a pointer to the &media_devnode @@ -145,11 +145,11 @@ static inline struct media_devnode *media_devnode_data(struct file *filp) * media_devnode_is_registered - returns true if &media_devnode is registered; * false otherwise. * - * @mdev: pointer to struct &media_devnode. + * @devnode: pointer to struct &media_devnode. */ -static inline int media_devnode_is_registered(struct media_devnode *mdev) +static inline int media_devnode_is_registered(struct media_devnode *devnode) { - return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags); + return test_bit(MEDIA_FLAG_REGISTERED, &devnode->flags); } #endif /* _MEDIA_DEVNODE_H */ -- 2.20.1