From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
Mauro Carvalho Chehab <mchehab@s-opensource.com>,
Ben Hutchings <ben.hutchings@codethink.co.uk>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 16/65] media-devnode: fix namespace mess
Date: Tue, 26 May 2020 20:52:35 +0200 [thread overview]
Message-ID: <20200526183912.318728302@linuxfoundation.org> (raw)
In-Reply-To: <20200526183905.988782958@linuxfoundation.org>
From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
commit 163f1e93e995048b894c5fc86a6034d16beed740 upstream.
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 <mchehab@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
[bwh: Backported to 4.4: adjust filename, context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/media-devnode.c | 114 +++++++++++++++++-----------------
include/media/media-devnode.h | 10 +--
2 files changed, 62 insertions(+), 62 deletions(-)
diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index 86c7c3732c84..98211c570e11 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;
}
@@ -221,7 +221,7 @@ static const struct file_operations media_devnode_fops = {
/**
* 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
*
* The registration code assigns minor numbers and registers the new device node
* with the kernel. An error is returned if no free minor number can be found,
@@ -233,7 +233,7 @@ static const struct file_operations media_devnode_fops = {
* 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)
{
int minor;
@@ -251,40 +251,40 @@ 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;
@@ -292,7 +292,7 @@ int __must_check media_devnode_register(struct media_devnode *mdev,
/**
* 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.
@@ -300,16 +300,16 @@ 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)
{
- /* 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 17ddae32060d..79f702d26d1f 100644
--- a/include/media/media-devnode.h
+++ b/include/media/media-devnode.h
@@ -80,24 +80,24 @@ 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 */
#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
-int __must_check media_devnode_register(struct media_devnode *mdev,
+int __must_check media_devnode_register(struct media_devnode *devnode,
struct module *owner);
-void media_devnode_unregister(struct media_devnode *mdev);
+void media_devnode_unregister(struct media_devnode *devnode);
static inline struct media_devnode *media_devnode_data(struct file *filp)
{
return filp->private_data;
}
-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 */
--
2.25.1
next prev parent reply other threads:[~2020-05-26 18:55 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 18:52 [PATCH 4.4 00/65] 4.4.225-rc1 review Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 01/65] igb: use igb_adapter->io_addr instead of e1000_hw->hw_addr Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 02/65] padata: Remove unused but set variables Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 03/65] padata: get_next is never NULL Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 04/65] padata: ensure the reorder timer callback runs on the correct CPU Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 05/65] padata: ensure padata_do_serial() " Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 06/65] evm: Check also if *tfm is an error pointer in init_desc() Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 07/65] fix multiplication overflow in copy_fdtable() Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 08/65] HID: multitouch: add eGalaxTouch P80H84 support Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 09/65] ceph: fix double unlock in handle_cap_export() Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 10/65] USB: core: Fix misleading driver bug report Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 11/65] platform/x86: asus-nb-wmi: Do not load on Asus T100TA and T200TA Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 12/65] ARM: futex: Address build warning Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 13/65] media: Fix media_open() to clear filp->private_data in error leg Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 14/65] drivers/media/media-devnode: clear private_data before put_device() Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 15/65] media-devnode: add missing mutex lock in error handler Greg Kroah-Hartman
2020-05-26 18:52 ` Greg Kroah-Hartman [this message]
2020-05-26 18:52 ` [PATCH 4.4 17/65] media-device: dynamically allocate struct media_devnode Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 18/65] media: fix use-after-free in cdev_put() when app exits after driver unbind Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 19/65] media: fix media devnode ioctl/syscall and unregister race Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 20/65] i2c: dev: switch from register_chrdev to cdev API Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 21/65] i2c: dev: dont start function name with return Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 22/65] i2c: dev: use after free in detach Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 23/65] i2c-dev: dont get i2c adapter via i2c_dev Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 24/65] i2c: dev: Fix the race between the release of i2c_dev and cdev Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 25/65] padata: set cpu_index of unused CPUs to -1 Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 26/65] sched/fair, cpumask: Export for_each_cpu_wrap() Greg Kroah-Hartman
2020-05-27 7:50 ` nobuhiro1.iwamatsu
2020-05-27 8:09 ` Greg KH
2020-05-27 14:03 ` Daniel Jordan
2020-05-26 18:52 ` [PATCH 4.4 27/65] padata: Replace delayed timer with immediate workqueue in padata_reorder Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 28/65] padata: initialize pd->cpu with effective cpumask Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 29/65] padata: purge get_cpu and reorder_via_wq from padata_do_serial Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 30/65] ALSA: pcm: fix incorrect hw_base increase Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 31/65] ext4: lock the xattr block before checksuming it Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 32/65] platform/x86: alienware-wmi: fix kfree on potentially uninitialized pointer Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 33/65] libnvdimm/btt: Remove unnecessary code in btt_freelist_init Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 34/65] l2tp: lock socket before checking flags in connect() Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 35/65] l2tp: fix racy socket lookup in l2tp_ip and l2tp_ip6 bind() Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 36/65] l2tp: hold session while sending creation notifications Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 37/65] l2tp: take a reference on sessions used in genetlink handlers Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 38/65] l2tp: dont use l2tp_tunnel_find() in l2tp_ip and l2tp_ip6 Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 39/65] net: l2tp: export debug flags to UAPI Greg Kroah-Hartman
2020-05-26 18:52 ` [PATCH 4.4 40/65] net: l2tp: deprecate PPPOL2TP_MSG_* in favour of L2TP_MSG_* Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 41/65] net: l2tp: ppp: change PPPOL2TP_MSG_* => L2TP_MSG_* Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 42/65] New kernel function to get IP overhead on a socket Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 43/65] L2TP:Adjust intf MTU, add underlay L3, L2 hdrs Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 44/65] l2tp: remove useless duplicate session detection in l2tp_netlink Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 45/65] l2tp: remove l2tp_session_find() Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 46/65] l2tp: define parameters of l2tp_session_get*() as "const" Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 47/65] l2tp: define parameters of l2tp_tunnel_find*() " Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 48/65] l2tp: initialise sessions refcount before making it reachable Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 49/65] l2tp: hold tunnel while looking up sessions in l2tp_netlink Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 50/65] l2tp: hold tunnel while processing genl delete command Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 51/65] l2tp: hold tunnel while handling genl tunnel updates Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 52/65] l2tp: hold tunnel while handling genl TUNNEL_GET commands Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 53/65] l2tp: hold tunnel used while creating sessions with netlink Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 54/65] l2tp: prevent creation of sessions on terminated tunnels Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 55/65] l2tp: pass tunnel pointer to ->session_create() Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 56/65] l2tp: fix l2tp_eth module loading Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 57/65] l2tp: dont register sessions in l2tp_session_create() Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 58/65] l2tp: initialise l2tp_eth sessions before registering them Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 59/65] l2tp: protect sock pointer of struct pppol2tp_session with RCU Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 60/65] l2tp: initialise PPP sessions before registering them Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 61/65] Revert "gfs2: Dont demote a glock until its revokes are written" Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 62/65] staging: iio: ad2s1210: Fix SPI reading Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 63/65] mei: release me_cl object reference Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 64/65] iio: sca3000: Remove an erroneous get_device() Greg Kroah-Hartman
2020-05-26 18:53 ` [PATCH 4.4 65/65] l2tp: device MTU setup, tunnel socket needs a lock Greg Kroah-Hartman
2020-05-27 8:32 ` [PATCH 4.4 00/65] 4.4.225-rc1 review Jon Hunter
2020-05-27 8:52 ` Naresh Kamboju
2020-05-27 10:30 ` Chris Paterson
2020-05-27 13:50 ` Guenter Roeck
2020-05-27 17:16 ` shuah
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