[media] uvcvideo: Use videobuf2-vmalloc (6998b6fb) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/media/video/uvc/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		config USB_VIDEO_CLASS
		tristate "USB Video Class (UVC)"
		select VIDEOBUF2_VMALLOC
		---help---
		Support for the USB Video Class (UVC). Currently only video
		input devices, such as webcams, are supported.

drivers/media/video/uvc/uvc_queue.c

+141 −415

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@
		*
		*/

		#include <linux/atomic.h>
		#include <linux/kernel.h>
		#include <linux/mm.h>
		#include <linux/list.h>
		@@ -19,7 +20,7 @@
		#include <linux/videodev2.h>
		#include <linux/vmalloc.h>
		#include <linux/wait.h>
		#include <linux/atomic.h>
		#include <media/videobuf2-vmalloc.h>

		#include "uvcvideo.h"

		@@ -29,470 +30,199 @@
		* Video queues is initialized by uvc_queue_init(). The function performs
		* basic initialization of the uvc_video_queue struct and never fails.
		*
		* Video buffer allocation and freeing are performed by uvc_alloc_buffers and
		* uvc_free_buffers respectively. The former acquires the video queue lock,
		* while the later must be called with the lock held (so that allocation can
		* free previously allocated buffers). Trying to free buffers that are mapped
		* to user space will return -EBUSY.
		*
		* Video buffers are managed using two queues. However, unlike most USB video
		* drivers that use an in queue and an out queue, we use a main queue to hold
		* all queued buffers (both 'empty' and 'done' buffers), and an irq queue to
		* hold empty buffers. This design (copied from video-buf) minimizes locking
		* in interrupt, as only one queue is shared between interrupt and user
		* contexts.
		*
		* Use cases
		* ---------
		*
		* Unless stated otherwise, all operations that modify the irq buffers queue
		* are protected by the irq spinlock.
		*
		* 1. The user queues the buffers, starts streaming and dequeues a buffer.
		*
		* The buffers are added to the main and irq queues. Both operations are
		* protected by the queue lock, and the later is protected by the irq
		* spinlock as well.
		*
		* The completion handler fetches a buffer from the irq queue and fills it
		* with video data. If no buffer is available (irq queue empty), the handler
		* returns immediately.
		*
		* When the buffer is full, the completion handler removes it from the irq
		* queue, marks it as done (UVC_BUF_STATE_DONE) and wakes its wait queue.
		* At that point, any process waiting on the buffer will be woken up. If a
		* process tries to dequeue a buffer after it has been marked done, the
		* dequeing will succeed immediately.
		*
		* 2. Buffers are queued, user is waiting on a buffer and the device gets
		* disconnected.
		*
		* When the device is disconnected, the kernel calls the completion handler
		* with an appropriate status code. The handler marks all buffers in the
		* irq queue as being erroneous (UVC_BUF_STATE_ERROR) and wakes them up so
		* that any process waiting on a buffer gets woken up.
		*
		* Waking up up the first buffer on the irq list is not enough, as the
		* process waiting on the buffer might restart the dequeue operation
		* immediately.
		*
		* Video buffers are managed by videobuf2. The driver uses a mutex to protect
		* the videobuf2 queue operations by serializing calls to videobuf2 and a
		* spinlock to protect the IRQ queue that holds the buffers to be processed by
		* the driver.
		*/

		void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
		int drop_corrupted)
		{
		mutex_init(&queue->mutex);
		spin_lock_init(&queue->irqlock);
		INIT_LIST_HEAD(&queue->mainqueue);
		INIT_LIST_HEAD(&queue->irqqueue);
		queue->flags = drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0;
		queue->type = type;
		}

		/*
		* Free the video buffers.
		*
		* This function must be called with the queue lock held.
		/* -----------------------------------------------------------------------------
		* videobuf2 queue operations
		*/
		static int __uvc_free_buffers(struct uvc_video_queue *queue)

		static int uvc_queue_setup(struct vb2_queue vq, const struct v4l2_format fmt,
		unsigned int nbuffers, unsigned int nplanes,
		unsigned int sizes[], void *alloc_ctxs[])
		{
		unsigned int i;
		struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
		struct uvc_streaming *stream =
		container_of(queue, struct uvc_streaming, queue);

		for (i = 0; i < queue->count; ++i) {
		if (queue->buffer[i].vma_use_count != 0)
		return -EBUSY;
		}
		if (*nbuffers > UVC_MAX_VIDEO_BUFFERS)
		*nbuffers = UVC_MAX_VIDEO_BUFFERS;

		if (queue->count) {
		uvc_queue_cancel(queue, 0);
		INIT_LIST_HEAD(&queue->mainqueue);
		vfree(queue->mem);
		queue->count = 0;
		}
		*nplanes = 1;

		sizes[0] = stream->ctrl.dwMaxVideoFrameSize;

		return 0;
		}

		int uvc_free_buffers(struct uvc_video_queue *queue)
		static int uvc_buffer_prepare(struct vb2_buffer *vb)
		{
		int ret;

		mutex_lock(&queue->mutex);
		ret = __uvc_free_buffers(queue);
		mutex_unlock(&queue->mutex);
		struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
		struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);

		return ret;
		if (vb->v4l2_buf.type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
		vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
		return -EINVAL;
		}

		/*
		* Allocate the video buffers.
		*
		* Pages are reserved to make sure they will not be swapped, as they will be
		* filled in the URB completion handler.
		*
		* Buffers will be individually mapped, so they must all be page aligned.
		*/
		int uvc_alloc_buffers(struct uvc_video_queue *queue, unsigned int nbuffers,
		unsigned int buflength)
		{
		unsigned int bufsize = PAGE_ALIGN(buflength);
		unsigned int i;
		void *mem = NULL;
		int ret;

		if (nbuffers > UVC_MAX_VIDEO_BUFFERS)
		nbuffers = UVC_MAX_VIDEO_BUFFERS;
		if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED))
		return -ENODEV;

		mutex_lock(&queue->mutex);
		buf->state = UVC_BUF_STATE_QUEUED;
		buf->error = 0;
		buf->mem = vb2_plane_vaddr(vb, 0);
		buf->length = vb2_plane_size(vb, 0);
		if (vb->v4l2_buf.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		buf->bytesused = 0;
		else
		buf->bytesused = vb2_get_plane_payload(vb, 0);

		if ((ret = __uvc_free_buffers(queue)) < 0)
		goto done;
		return 0;
		}

		/* Bail out if no buffers should be allocated. */
		if (nbuffers == 0)
		goto done;
		static void uvc_buffer_queue(struct vb2_buffer *vb)
		{
		struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
		struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);
		unsigned long flags;

		/* Decrement the number of buffers until allocation succeeds. */
		for (; nbuffers > 0; --nbuffers) {
		mem = vmalloc_32(nbuffers * bufsize);
		if (mem != NULL)
		break;
		spin_lock_irqsave(&queue->irqlock, flags);
		if (likely(!(queue->flags & UVC_QUEUE_DISCONNECTED))) {
		list_add_tail(&buf->queue, &queue->irqqueue);
		} else {
		/* If the device is disconnected return the buffer to userspace
		* directly. The next QBUF call will fail with -ENODEV.
		*/
		buf->state = UVC_BUF_STATE_ERROR;
		vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR);
		}

		if (mem == NULL) {
		ret = -ENOMEM;
		goto done;
		spin_unlock_irqrestore(&queue->irqlock, flags);
		}

		for (i = 0; i < nbuffers; ++i) {
		memset(&queue->buffer[i], 0, sizeof queue->buffer[i]);
		queue->buffer[i].buf.index = i;
		queue->buffer[i].buf.m.offset = i * bufsize;
		queue->buffer[i].buf.length = buflength;
		queue->buffer[i].buf.type = queue->type;
		queue->buffer[i].buf.field = V4L2_FIELD_NONE;
		queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP;
		queue->buffer[i].buf.flags = 0;

		queue->buffer[i].mem = queue->mem + i * bufsize;
		queue->buffer[i].length = buflength;
		init_waitqueue_head(&queue->buffer[i].wait);
		}
		static struct vb2_ops uvc_queue_qops = {
		.queue_setup = uvc_queue_setup,
		.buf_prepare = uvc_buffer_prepare,
		.buf_queue = uvc_buffer_queue,
		};

		queue->mem = mem;
		queue->count = nbuffers;
		queue->buf_size = bufsize;
		ret = nbuffers;
		void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
		int drop_corrupted)
		{
		queue->queue.type = type;
		queue->queue.io_modes = VB2_MMAP;
		queue->queue.drv_priv = queue;
		queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
		queue->queue.ops = &uvc_queue_qops;
		queue->queue.mem_ops = &vb2_vmalloc_memops;
		vb2_queue_init(&queue->queue);

		done:
		mutex_unlock(&queue->mutex);
		return ret;
		mutex_init(&queue->mutex);
		spin_lock_init(&queue->irqlock);
		INIT_LIST_HEAD(&queue->irqqueue);
		queue->flags = drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0;
		}

		/*
		* Check if buffers have been allocated.
		/* -----------------------------------------------------------------------------
		* V4L2 queue operations
		*/
		int uvc_queue_allocated(struct uvc_video_queue *queue)

		int uvc_alloc_buffers(struct uvc_video_queue *queue,
		struct v4l2_requestbuffers *rb)
		{
		int allocated;
		int ret;

		mutex_lock(&queue->mutex);
		allocated = queue->count != 0;
		ret = vb2_reqbufs(&queue->queue, rb);
		mutex_unlock(&queue->mutex);

		return allocated;
		return ret ? ret : rb->count;
		}

		static void __uvc_query_buffer(struct uvc_buffer *buf,
		struct v4l2_buffer *v4l2_buf)
		void uvc_free_buffers(struct uvc_video_queue *queue)
		{
		memcpy(v4l2_buf, &buf->buf, sizeof *v4l2_buf);

		if (buf->vma_use_count)
		v4l2_buf->flags \|= V4L2_BUF_FLAG_MAPPED;

		switch (buf->state) {
		case UVC_BUF_STATE_ERROR:
		case UVC_BUF_STATE_DONE:
		v4l2_buf->flags \|= V4L2_BUF_FLAG_DONE;
		break;
		case UVC_BUF_STATE_QUEUED:
		case UVC_BUF_STATE_ACTIVE:
		case UVC_BUF_STATE_READY:
		v4l2_buf->flags \|= V4L2_BUF_FLAG_QUEUED;
		break;
		case UVC_BUF_STATE_IDLE:
		default:
		break;
		}
		mutex_lock(&queue->mutex);
		vb2_queue_release(&queue->queue);
		mutex_unlock(&queue->mutex);
		}

		int uvc_query_buffer(struct uvc_video_queue *queue,
		struct v4l2_buffer *v4l2_buf)
		int uvc_query_buffer(struct uvc_video_queue queue, struct v4l2_buffer buf)
		{
		int ret = 0;
		int ret;

		mutex_lock(&queue->mutex);
		if (v4l2_buf->index >= queue->count) {
		ret = -EINVAL;
		goto done;
		}

		__uvc_query_buffer(&queue->buffer[v4l2_buf->index], v4l2_buf);

		done:
		ret = vb2_querybuf(&queue->queue, buf);
		mutex_unlock(&queue->mutex);

		return ret;
		}

		/*
		* Queue a video buffer. Attempting to queue a buffer that has already been
		* queued will return -EINVAL.
		*/
		int uvc_queue_buffer(struct uvc_video_queue *queue,
		struct v4l2_buffer *v4l2_buf)
		int uvc_queue_buffer(struct uvc_video_queue queue, struct v4l2_buffer buf)
		{
		struct uvc_buffer *buf;
		unsigned long flags;
		int ret = 0;

		uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index);

		if (v4l2_buf->type != queue->type \|\|
		v4l2_buf->memory != V4L2_MEMORY_MMAP) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
		"and/or memory (%u).\n", v4l2_buf->type,
		v4l2_buf->memory);
		return -EINVAL;
		}
		int ret;

		mutex_lock(&queue->mutex);
		if (v4l2_buf->index >= queue->count) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Out of range index.\n");
		ret = -EINVAL;
		goto done;
		}

		buf = &queue->buffer[v4l2_buf->index];
		if (buf->state != UVC_BUF_STATE_IDLE) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state "
		"(%u).\n", buf->state);
		ret = -EINVAL;
		goto done;
		}

		if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
		v4l2_buf->bytesused > buf->buf.length) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
		ret = -EINVAL;
		goto done;
		}

		spin_lock_irqsave(&queue->irqlock, flags);
		if (queue->flags & UVC_QUEUE_DISCONNECTED) {
		spin_unlock_irqrestore(&queue->irqlock, flags);
		ret = -ENODEV;
		goto done;
		}
		buf->state = UVC_BUF_STATE_QUEUED;
		if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		buf->bytesused = 0;
		else
		buf->bytesused = v4l2_buf->bytesused;

		list_add_tail(&buf->stream, &queue->mainqueue);
		list_add_tail(&buf->queue, &queue->irqqueue);
		spin_unlock_irqrestore(&queue->irqlock, flags);

		done:
		ret = vb2_qbuf(&queue->queue, buf);
		mutex_unlock(&queue->mutex);
		return ret;
		}

		static int uvc_queue_waiton(struct uvc_buffer *buf, int nonblocking)
		{
		if (nonblocking) {
		return (buf->state != UVC_BUF_STATE_QUEUED &&
		buf->state != UVC_BUF_STATE_ACTIVE &&
		buf->state != UVC_BUF_STATE_READY)
		? 0 : -EAGAIN;
		}

		return wait_event_interruptible(buf->wait,
		buf->state != UVC_BUF_STATE_QUEUED &&
		buf->state != UVC_BUF_STATE_ACTIVE &&
		buf->state != UVC_BUF_STATE_READY);
		return ret;
		}

		/*
		* Dequeue a video buffer. If nonblocking is false, block until a buffer is
		* available.
		*/
		int uvc_dequeue_buffer(struct uvc_video_queue *queue,
		struct v4l2_buffer *v4l2_buf, int nonblocking)
		int uvc_dequeue_buffer(struct uvc_video_queue queue, struct v4l2_buffer buf,
		int nonblocking)
		{
		struct uvc_buffer *buf;
		int ret = 0;

		if (v4l2_buf->type != queue->type \|\|
		v4l2_buf->memory != V4L2_MEMORY_MMAP) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
		"and/or memory (%u).\n", v4l2_buf->type,
		v4l2_buf->memory);
		return -EINVAL;
		}
		int ret;

		mutex_lock(&queue->mutex);
		if (list_empty(&queue->mainqueue)) {
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Empty buffer queue.\n");
		ret = -EINVAL;
		goto done;
		}

		buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
		if ((ret = uvc_queue_waiton(buf, nonblocking)) < 0)
		goto done;

		uvc_trace(UVC_TRACE_CAPTURE, "Dequeuing buffer %u (%u, %u bytes).\n",
		buf->buf.index, buf->state, buf->buf.bytesused);

		switch (buf->state) {
		case UVC_BUF_STATE_ERROR:
		uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data "
		"(transmission error).\n");
		ret = -EIO;
		case UVC_BUF_STATE_DONE:
		buf->state = UVC_BUF_STATE_IDLE;
		break;

		case UVC_BUF_STATE_IDLE:
		case UVC_BUF_STATE_QUEUED:
		case UVC_BUF_STATE_ACTIVE:
		case UVC_BUF_STATE_READY:
		default:
		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u "
		"(driver bug?).\n", buf->state);
		ret = -EINVAL;
		goto done;
		}

		list_del(&buf->stream);
		__uvc_query_buffer(buf, v4l2_buf);

		done:
		ret = vb2_dqbuf(&queue->queue, buf, nonblocking);
		mutex_unlock(&queue->mutex);
		return ret;
		}

		/*
		* VMA operations.
		*/
		static void uvc_vm_open(struct vm_area_struct *vma)
		{
		struct uvc_buffer *buffer = vma->vm_private_data;
		buffer->vma_use_count++;
		}

		static void uvc_vm_close(struct vm_area_struct *vma)
		{
		struct uvc_buffer *buffer = vma->vm_private_data;
		buffer->vma_use_count--;
		return ret;
		}

		static const struct vm_operations_struct uvc_vm_ops = {
		.open = uvc_vm_open,
		.close = uvc_vm_close,
		};

		/*
		* Memory-map a video buffer.
		*
		* This function implements video buffers memory mapping and is intended to be
		* used by the device mmap handler.
		*/
		int uvc_queue_mmap(struct uvc_video_queue queue, struct vm_area_struct vma)
		{
		struct uvc_buffer *uninitialized_var(buffer);
		struct page *page;
		unsigned long addr, start, size;
		unsigned int i;
		int ret = 0;

		start = vma->vm_start;
		size = vma->vm_end - vma->vm_start;
		int ret;

		mutex_lock(&queue->mutex);
		ret = vb2_mmap(&queue->queue, vma);
		mutex_unlock(&queue->mutex);

		for (i = 0; i < queue->count; ++i) {
		buffer = &queue->buffer[i];
		if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
		break;
		}

		if (i == queue->count \|\| PAGE_ALIGN(size) != queue->buf_size) {
		ret = -EINVAL;
		goto done;
		}

		/*
		* VM_IO marks the area as being an mmaped region for I/O to a
		* device. It also prevents the region from being core dumped.
		*/
		vma->vm_flags \|= VM_IO;

		addr = (unsigned long)buffer->mem;
		#ifdef CONFIG_MMU
		while (size > 0) {
		page = vmalloc_to_page((void *)addr);
		if ((ret = vm_insert_page(vma, start, page)) < 0)
		goto done;

		start += PAGE_SIZE;
		addr += PAGE_SIZE;
		size -= PAGE_SIZE;
		return ret;
		}
		#endif

		vma->vm_ops = &uvc_vm_ops;
		vma->vm_private_data = buffer;
		uvc_vm_open(vma);
		unsigned int uvc_queue_poll(struct uvc_video_queue queue, struct file file,
		poll_table *wait)
		{
		unsigned int ret;

		done:
		mutex_lock(&queue->mutex);
		ret = vb2_poll(&queue->queue, file, wait);
		mutex_unlock(&queue->mutex);

		return ret;
		}

		/*
		* Poll the video queue.
		/* -----------------------------------------------------------------------------
		*
		* This function implements video queue polling and is intended to be used by
		* the device poll handler.
		*/
		unsigned int uvc_queue_poll(struct uvc_video_queue queue, struct file file,
		poll_table *wait)

		/*
		* Check if buffers have been allocated.
		*/
		int uvc_queue_allocated(struct uvc_video_queue *queue)
		{
		struct uvc_buffer *buf;
		unsigned int mask = 0;
		int allocated;

		mutex_lock(&queue->mutex);
		if (list_empty(&queue->mainqueue)) {
		mask \|= POLLERR;
		goto done;
		}
		buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);

		poll_wait(file, &buf->wait, wait);
		if (buf->state == UVC_BUF_STATE_DONE \|\|
		buf->state == UVC_BUF_STATE_ERROR) {
		if (queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		mask \|= POLLIN \| POLLRDNORM;
		else
		mask \|= POLLOUT \| POLLWRNORM;
		}

		done:
		allocated = vb2_is_busy(&queue->queue);
		mutex_unlock(&queue->mutex);
		return mask;

		return allocated;
		}

		#ifndef CONFIG_MMU
		@@ -543,27 +273,24 @@ unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
		*/
		int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
		{
		unsigned int i;
		int ret = 0;
		unsigned long flags;
		int ret;

		mutex_lock(&queue->mutex);
		if (enable) {
		if (uvc_queue_streaming(queue)) {
		ret = -EBUSY;
		ret = vb2_streamon(&queue->queue, queue->queue.type);
		if (ret < 0)
		goto done;
		}
		queue->flags \|= UVC_QUEUE_STREAMING;

		queue->buf_used = 0;
		} else {
		uvc_queue_cancel(queue, 0);
		INIT_LIST_HEAD(&queue->mainqueue);

		for (i = 0; i < queue->count; ++i) {
		queue->buffer[i].error = 0;
		queue->buffer[i].state = UVC_BUF_STATE_IDLE;
		}
		ret = vb2_streamoff(&queue->queue, queue->queue.type);
		if (ret < 0)
		goto done;

		queue->flags &= ~UVC_QUEUE_STREAMING;
		spin_lock_irqsave(&queue->irqlock, flags);
		INIT_LIST_HEAD(&queue->irqqueue);
		spin_unlock_irqrestore(&queue->irqlock, flags);
		}

		done:
		@@ -594,12 +321,12 @@ void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
		queue);
		list_del(&buf->queue);
		buf->state = UVC_BUF_STATE_ERROR;
		wake_up(&buf->wait);
		vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR);
		}
		/* This must be protected by the irqlock spinlock to avoid race
		* conditions between uvc_queue_buffer and the disconnection event that
		* conditions between uvc_buffer_queue and the disconnection event that
		* could result in an interruptible wait in uvc_dequeue_buffer. Do not
		* blindly replace this logic by checking for the UVC_DEV_DISCONNECTED
		* blindly replace this logic by checking for the UVC_QUEUE_DISCONNECTED
		* state outside the queue code.
		*/
		if (disconnect)
		@@ -616,15 +343,12 @@ struct uvc_buffer uvc_queue_next_buffer(struct uvc_video_queue queue,
		if ((queue->flags & UVC_QUEUE_DROP_CORRUPTED) && buf->error) {
		buf->error = 0;
		buf->state = UVC_BUF_STATE_QUEUED;
		buf->buf.bytesused = 0;
		vb2_set_plane_payload(&buf->buf, 0, 0);
		return buf;
		}

		spin_lock_irqsave(&queue->irqlock, flags);
		list_del(&buf->queue);
		buf->error = 0;
		buf->state = UVC_BUF_STATE_DONE;
		buf->buf.bytesused = buf->bytesused;
		if (!list_empty(&queue->irqqueue))
		nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
		queue);
		@@ -632,7 +356,9 @@ struct uvc_buffer uvc_queue_next_buffer(struct uvc_video_queue queue,
		nextbuf = NULL;
		spin_unlock_irqrestore(&queue->irqlock, flags);

		wake_up(&buf->wait);
		buf->state = buf->error ? VB2_BUF_STATE_ERROR : UVC_BUF_STATE_DONE;
		vb2_set_plane_payload(&buf->buf, 0, buf->bytesused);
		vb2_buffer_done(&buf->buf, VB2_BUF_STATE_DONE);

		return nextbuf;
		}

drivers/media/video/uvc/uvc_v4l2.c

+2 −18

Original line number	Diff line number	Diff line
		@@ -513,10 +513,7 @@ static int uvc_v4l2_release(struct file *file)
		/* Only free resources if this is a privileged handle. */
		if (uvc_has_privileges(handle)) {
		uvc_video_enable(stream, 0);

		if (uvc_free_buffers(&stream->queue) < 0)
		uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
		"free buffers.\n");
		uvc_free_buffers(&stream->queue);
		}

		/* Release the file handle. */
		@@ -914,19 +911,11 @@ static long uvc_v4l2_do_ioctl(struct file file, unsigned int cmd, void arg)

		/* Buffers & streaming */
		case VIDIOC_REQBUFS:
		{
		struct v4l2_requestbuffers *rb = arg;

		if (rb->type != stream->type \|\|
		rb->memory != V4L2_MEMORY_MMAP)
		return -EINVAL;

		if ((ret = uvc_acquire_privileges(handle)) < 0)
		return ret;

		mutex_lock(&stream->mutex);
		ret = uvc_alloc_buffers(&stream->queue, rb->count,
		stream->ctrl.dwMaxVideoFrameSize);
		ret = uvc_alloc_buffers(&stream->queue, arg);
		mutex_unlock(&stream->mutex);
		if (ret < 0)
		return ret;
		@@ -934,18 +923,13 @@ static long uvc_v4l2_do_ioctl(struct file file, unsigned int cmd, void arg)
		if (ret == 0)
		uvc_dismiss_privileges(handle);

		rb->count = ret;
		ret = 0;
		break;
		}

		case VIDIOC_QUERYBUF:
		{
		struct v4l2_buffer *buf = arg;

		if (buf->type != stream->type)
		return -EINVAL;

		if (!uvc_has_privileges(handle))
		return -EBUSY;

drivers/media/video/uvc/uvc_video.c

+5 −4

Original line number	Diff line number	Diff line
		@@ -467,9 +467,10 @@ static int uvc_video_decode_start(struct uvc_streaming *stream,
		else
		ktime_get_real_ts(&ts);

		buf->buf.sequence = stream->sequence;
		buf->buf.timestamp.tv_sec = ts.tv_sec;
		buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
		buf->buf.v4l2_buf.sequence = stream->sequence;
		buf->buf.v4l2_buf.timestamp.tv_sec = ts.tv_sec;
		buf->buf.v4l2_buf.timestamp.tv_usec =
		ts.tv_nsec / NSEC_PER_USEC;

		/* TODO: Handle PTS and SCR. */
		buf->state = UVC_BUF_STATE_ACTIVE;
		@@ -728,7 +729,7 @@ static void uvc_video_encode_bulk(struct urb urb, struct uvc_streaming stream,
		if (buf->bytesused == stream->queue.buf_used) {
		stream->queue.buf_used = 0;
		buf->state = UVC_BUF_STATE_READY;
		buf->buf.sequence = ++stream->sequence;
		buf->buf.v4l2_buf.sequence = ++stream->sequence;
		uvc_queue_next_buffer(&stream->queue, buf);
		stream->last_fid ^= UVC_STREAM_FID;
		}

drivers/media/video/uvc/uvcvideo.h

+12 −21

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		#include <linux/videodev2.h>
		#include <media/media-device.h>
		#include <media/v4l2-device.h>
		#include <media/videobuf2-core.h>

		/* --------------------------------------------------------------------------
		* UVC constants
		@@ -319,13 +320,9 @@ enum uvc_buffer_state {
		};

		struct uvc_buffer {
		unsigned long vma_use_count;
		struct list_head stream;

		/* Touched by interrupt handler. */
		struct v4l2_buffer buf;
		struct vb2_buffer buf;
		struct list_head queue;
		wait_queue_head_t wait;

		enum uvc_buffer_state state;
		unsigned int error;

		@@ -334,24 +331,17 @@ struct uvc_buffer {
		unsigned int bytesused;
		};

		#define UVC_QUEUE_STREAMING (1 << 0)
		#define UVC_QUEUE_DISCONNECTED (1 << 1)
		#define UVC_QUEUE_DROP_CORRUPTED (1 << 2)
		#define UVC_QUEUE_DISCONNECTED (1 << 0)
		#define UVC_QUEUE_DROP_CORRUPTED (1 << 1)

		struct uvc_video_queue {
		enum v4l2_buf_type type;
		struct vb2_queue queue;
		struct mutex mutex; /* Protects queue */

		void *mem;
		unsigned int flags;

		unsigned int count;
		unsigned int buf_size;
		unsigned int buf_used;
		struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
		struct mutex mutex; /* protects buffers and mainqueue */
		spinlock_t irqlock; /* protects irqqueue */

		struct list_head mainqueue;
		spinlock_t irqlock; /* Protects irqqueue */
		struct list_head irqqueue;
		};

		@@ -391,6 +381,7 @@ struct uvc_streaming {
		*/
		struct mutex mutex;

		/* Buffers queue. */
		unsigned int frozen : 1;
		struct uvc_video_queue queue;
		void (decode) (struct urb urb, struct uvc_streaming *video,
		@@ -520,8 +511,8 @@ extern struct uvc_entity uvc_entity_by_id(struct uvc_device dev, int id);
		extern void uvc_queue_init(struct uvc_video_queue *queue,
		enum v4l2_buf_type type, int drop_corrupted);
		extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
		unsigned int nbuffers, unsigned int buflength);
		extern int uvc_free_buffers(struct uvc_video_queue *queue);
		struct v4l2_requestbuffers *rb);
		extern void uvc_free_buffers(struct uvc_video_queue *queue);
		extern int uvc_query_buffer(struct uvc_video_queue *queue,
		struct v4l2_buffer *v4l2_buf);
		extern int uvc_queue_buffer(struct uvc_video_queue *queue,
		@@ -543,7 +534,7 @@ extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
		extern int uvc_queue_allocated(struct uvc_video_queue *queue);
		static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
		{
		return queue->flags & UVC_QUEUE_STREAMING;
		return vb2_is_streaming(&queue->queue);
		}

		/* V4L2 interface */