From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
To keep V4L2 drivers that did not yet convert to unlocked_ioctl happy,
the v4l2 core had a .ioctl file operation that took a V4L2 lock.
The last drivers are now converted to unlocked_ioctl, so all this
old code can now be removed.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-dev.c | 28 ----------------------------
drivers/media/v4l2-core/v4l2-device.c | 1 -
include/media/v4l2-dev.h | 1 -
include/media/v4l2-device.h | 2 --
4 files changed, 32 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index d89d5cb..9f4538c 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -357,34 +357,6 @@ static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
if (lock)
mutex_unlock(lock);
- } else if (vdev->fops->ioctl) {
- /* This code path is a replacement for the BKL. It is a major
- * hack but it will have to do for those drivers that are not
- * yet converted to use unlocked_ioctl.
- *
- * All drivers implement struct v4l2_device, so we use the
- * lock defined there to serialize the ioctls.
- *
- * However, if the driver sleeps, then it blocks all ioctls
- * since the lock is still held. This is very common for
- * VIDIOC_DQBUF since that normally waits for a frame to arrive.
- * As a result any other ioctl calls will proceed very, very
- * slowly since each call will have to wait for the VIDIOC_QBUF
- * to finish. Things that should take 0.01s may now take 10-20
- * seconds.
- *
- * The workaround is to *not* take the lock for VIDIOC_DQBUF.
- * This actually works OK for videobuf-based drivers, since
- * videobuf will take its own internal lock.
- */
- struct mutex *m = &vdev->v4l2_dev->ioctl_lock;
-
- if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m))
- return -ERESTARTSYS;
- if (video_is_registered(vdev))
- ret = vdev->fops->ioctl(filp, cmd, arg);
- if (cmd != VIDIOC_DQBUF)
- mutex_unlock(m);
} else
ret = -ENOTTY;
diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
index 204cc67..5b0a30b 100644
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -37,7 +37,6 @@ int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
INIT_LIST_HEAD(&v4l2_dev->subdevs);
spin_lock_init(&v4l2_dev->lock);
- mutex_init(&v4l2_dev->ioctl_lock);
v4l2_prio_init(&v4l2_dev->prio);
kref_init(&v4l2_dev->ref);
get_device(dev);
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 3e4fddf..acbcd2f 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -65,7 +65,6 @@ struct v4l2_file_operations {
ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
unsigned int (*poll) (struct file *, struct poll_table_struct *);
- long (*ioctl) (struct file *, unsigned int, unsigned long);
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
#ifdef CONFIG_COMPAT
long (*compat_ioctl32) (struct file *, unsigned int, unsigned long);
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index ffb69da..9c58157 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -58,8 +58,6 @@ struct v4l2_device {
struct v4l2_ctrl_handler *ctrl_handler;
/* Device's priority state */
struct v4l2_prio_state prio;
- /* BKL replacement mutex. Temporary solution only. */
- struct mutex ioctl_lock;
/* Keep track of the references to this struct. */
struct kref ref;
/* Release function that is called when the ref count goes to 0. */
--
2.1.4
--
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