[media] v4l2-dev: remove V4L2_FL_LOCK_ALL_FOPS

All drivers that needed V4L2_FL_LOCK_ALL_FOPS have been converted,
so remove this flag altogether.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 07aeafc..71237f5 100644 (file)
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -298,13 +298,8 @@ static ssize_t v4l2_read(struct file *filp, char __user *buf,
 
        if (!vdev->fops->read)
                return -EINVAL;
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
-           mutex_lock_interruptible(vdev->lock))
-               return -ERESTARTSYS;
        if (video_is_registered(vdev))
                ret = vdev->fops->read(filp, buf, sz, off);
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-               mutex_unlock(vdev->lock);
        if (vdev->debug)
                printk(KERN_DEBUG "%s: read: %zd (%d)\n",
                        video_device_node_name(vdev), sz, ret);
@@ -319,13 +314,8 @@ static ssize_t v4l2_write(struct file *filp, const char __user *buf,
 
        if (!vdev->fops->write)
                return -EINVAL;
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
-           mutex_lock_interruptible(vdev->lock))
-               return -ERESTARTSYS;
        if (video_is_registered(vdev))
                ret = vdev->fops->write(filp, buf, sz, off);
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-               mutex_unlock(vdev->lock);
        if (vdev->debug)
                printk(KERN_DEBUG "%s: write: %zd (%d)\n",
                        video_device_node_name(vdev), sz, ret);
@@ -335,20 +325,16 @@ static ssize_t v4l2_write(struct file *filp, const char __user *buf,
 static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll)
 {
        struct video_device *vdev = video_devdata(filp);
-       int ret = POLLERR | POLLHUP;
+       unsigned int res = POLLERR | POLLHUP;
 
        if (!vdev->fops->poll)
                return DEFAULT_POLLMASK;
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-               mutex_lock(vdev->lock);
        if (video_is_registered(vdev))
-               ret = vdev->fops->poll(filp, poll);
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-               mutex_unlock(vdev->lock);
+               res = vdev->fops->poll(filp, poll);
        if (vdev->debug)
                printk(KERN_DEBUG "%s: poll: %08x\n",
-                       video_device_node_name(vdev), ret);
-       return ret;
+                       video_device_node_name(vdev), res);
+       return res;
 }
 
 static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
@@ -432,14 +418,9 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
        int ret = -ENODEV;
 
        if (!vdev->fops->mmap)
-               return ret;
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
-           mutex_lock_interruptible(vdev->lock))
-               return -ERESTARTSYS;
+               return -ENODEV;
        if (video_is_registered(vdev))
                ret = vdev->fops->mmap(filp, vm);
-       if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-               mutex_unlock(vdev->lock);
        if (vdev->debug)
                printk(KERN_DEBUG "%s: mmap (%d)\n",
                        video_device_node_name(vdev), ret);
@@ -464,20 +445,12 @@ static int v4l2_open(struct inode *inode, struct file *filp)
        video_get(vdev);
        mutex_unlock(&videodev_lock);
        if (vdev->fops->open) {
-               if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
-                   mutex_lock_interruptible(vdev->lock)) {
-                       ret = -ERESTARTSYS;
-                       goto err;
-               }
                if (video_is_registered(vdev))
                        ret = vdev->fops->open(filp);
                else
                        ret = -ENODEV;
-               if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-                       mutex_unlock(vdev->lock);
        }
 
-err:
        if (vdev->debug)
                printk(KERN_DEBUG "%s: open (%d)\n",
                        video_device_node_name(vdev), ret);
@@ -493,16 +466,12 @@ static int v4l2_release(struct inode *inode, struct file *filp)
        struct video_device *vdev = video_devdata(filp);
        int ret = 0;
 
-       if (vdev->fops->release) {
-               if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-                       mutex_lock(vdev->lock);
-               vdev->fops->release(filp);
-               if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
-                       mutex_unlock(vdev->lock);
-       }
+       if (vdev->fops->release)
+               ret = vdev->fops->release(filp);
        if (vdev->debug)
                printk(KERN_DEBUG "%s: release\n",
                        video_device_node_name(vdev));
+
        /* decrease the refcount unconditionally since the release()
           return value is ignored. */
        video_put(vdev);
@@ -882,10 +851,6 @@ int __video_register_device(struct video_device *vdev, int type, int nr,
        WARN_ON(video_device[vdev->minor] != NULL);
        vdev->index = get_index(vdev);
        mutex_unlock(&videodev_lock);
-       /* if no lock was passed, then make sure the LOCK_ALL_FOPS bit is
-          clear and warn if it wasn't. */
-       if (vdev->lock == NULL)
-               WARN_ON(test_and_clear_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags));
 
        if (vdev->ioctl_ops)
                determine_valid_ioctls(vdev);

diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c
index 268c7dd..4da3df6 100644 (file)
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -2270,10 +2270,9 @@ ssize_t vb2_fop_write(struct file *file, char __user *buf,
 {
        struct video_device *vdev = video_devdata(file);
        struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
-       bool must_lock = !test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && lock;
        int err = -EBUSY;
 
-       if (must_lock && mutex_lock_interruptible(lock))
+       if (lock && mutex_lock_interruptible(lock))
                return -ERESTARTSYS;
        if (vb2_queue_is_busy(vdev, file))
                goto exit;
@@ -2282,7 +2281,7 @@ ssize_t vb2_fop_write(struct file *file, char __user *buf,
        if (err >= 0)
                vdev->queue->owner = file->private_data;
 exit:
-       if (must_lock)
+       if (lock)
                mutex_unlock(lock);
        return err;
 }
@@ -2293,10 +2292,9 @@ ssize_t vb2_fop_read(struct file *file, char __user *buf,
 {
        struct video_device *vdev = video_devdata(file);
        struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
-       bool must_lock = !test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && vdev->lock;
        int err = -EBUSY;
 
-       if (must_lock && mutex_lock_interruptible(lock))
+       if (lock && mutex_lock_interruptible(lock))
                return -ERESTARTSYS;
        if (vb2_queue_is_busy(vdev, file))
                goto exit;
@@ -2305,7 +2303,7 @@ ssize_t vb2_fop_read(struct file *file, char __user *buf,
        if (err >= 0)
                vdev->queue->owner = file->private_data;
 exit:
-       if (must_lock)
+       if (lock)
                mutex_unlock(lock);
        return err;
 }
@@ -2319,11 +2317,6 @@ unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
        unsigned long req_events = poll_requested_events(wait);
        unsigned res;
        void *fileio;
-       /* Yuck. We really need to get rid of this flag asap. If it is
-          set, then the core took the serialization lock before calling
-          poll(). This is being phased out, but for now we have to handle
-          this case. */
-       bool locked = test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags);
        bool must_lock = false;
 
        /* Try to be smart: only lock if polling might start fileio,
@@ -2339,9 +2332,9 @@ unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
 
        /* If locking is needed, but this helper doesn't know how, then you
           shouldn't be using this helper but you should write your own. */
-       WARN_ON(must_lock && !locked && !lock);
+       WARN_ON(must_lock && !lock);
 
-       if (must_lock && !locked && lock && mutex_lock_interruptible(lock))
+       if (must_lock && lock && mutex_lock_interruptible(lock))
                return POLLERR;
 
        fileio = q->fileio;
@@ -2351,7 +2344,7 @@ unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
        /* If fileio was started, then we have a new queue owner. */
        if (must_lock && !fileio && q->fileio)
                q->owner = file->private_data;
-       if (must_lock && !locked && lock)
+       if (must_lock && lock)
                mutex_unlock(lock);
        return res;
 }

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 5c416cd..6ee8897 100644 (file)
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -39,9 +39,6 @@ struct v4l2_ctrl_handler;
 #define V4L2_FL_USES_V4L2_FH   (1)
 /* Use the prio field of v4l2_fh for core priority checking */
 #define V4L2_FL_USE_FH_PRIO    (2)
-/* If ioctl core locking is in use, then apply that also to all
-   file operations. Don't use this flag in new drivers! */
-#define V4L2_FL_LOCK_ALL_FOPS  (3)
 
 /* Priority helper functions */