diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-mem2mem.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-mem2mem.c | 647 |
1 files changed, 647 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c new file mode 100644 index 000000000000..3ac83583ad7a --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c @@ -0,0 +1,647 @@ +/* + * Memory-to-memory device framework for Video for Linux 2 and videobuf. + * + * Helper functions for devices that use videobuf buffers for both their + * source and destination. + * + * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd. + * Pawel Osciak, <pawel@osciak.com> + * Marek Szyprowski, <m.szyprowski@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/slab.h> + +#include <media/videobuf2-core.h> +#include <media/v4l2-mem2mem.h> +#include <media/v4l2-dev.h> +#include <media/v4l2-fh.h> +#include <media/v4l2-event.h> + +MODULE_DESCRIPTION("Mem to mem device framework for videobuf"); +MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); +MODULE_LICENSE("GPL"); + +static bool debug; +module_param(debug, bool, 0644); + +#define dprintk(fmt, arg...) \ + do { \ + if (debug) \ + printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\ + } while (0) + + +/* Instance is already queued on the job_queue */ +#define TRANS_QUEUED (1 << 0) +/* Instance is currently running in hardware */ +#define TRANS_RUNNING (1 << 1) + + +/* Offset base for buffers on the destination queue - used to distinguish + * between source and destination buffers when mmapping - they receive the same + * offsets but for different queues */ +#define DST_QUEUE_OFF_BASE (1 << 30) + + +/** + * struct v4l2_m2m_dev - per-device context + * @curr_ctx: currently running instance + * @job_queue: instances queued to run + * @job_spinlock: protects job_queue + * @m2m_ops: driver callbacks + */ +struct v4l2_m2m_dev { + struct v4l2_m2m_ctx *curr_ctx; + + struct list_head job_queue; + spinlock_t job_spinlock; + + struct v4l2_m2m_ops *m2m_ops; +}; + +static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + if (V4L2_TYPE_IS_OUTPUT(type)) + return &m2m_ctx->out_q_ctx; + else + return &m2m_ctx->cap_q_ctx; +} + +/** + * v4l2_m2m_get_vq() - return vb2_queue for the given type + */ +struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + struct v4l2_m2m_queue_ctx *q_ctx; + + q_ctx = get_queue_ctx(m2m_ctx, type); + if (!q_ctx) + return NULL; + + return &q_ctx->q; +} +EXPORT_SYMBOL(v4l2_m2m_get_vq); + +/** + * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers + */ +void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) +{ + struct v4l2_m2m_buffer *b = NULL; + unsigned long flags; + + spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); + + if (list_empty(&q_ctx->rdy_queue)) { + spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); + return NULL; + } + + b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); + spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); + return &b->vb; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); + +/** + * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and + * return it + */ +void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) +{ + struct v4l2_m2m_buffer *b = NULL; + unsigned long flags; + + spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); + if (list_empty(&q_ctx->rdy_queue)) { + spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); + return NULL; + } + b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); + list_del(&b->list); + q_ctx->num_rdy--; + spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); + + return &b->vb; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove); + +/* + * Scheduling handlers + */ + +/** + * v4l2_m2m_get_curr_priv() - return driver private data for the currently + * running instance or NULL if no instance is running + */ +void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev) +{ + unsigned long flags; + void *ret = NULL; + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags); + if (m2m_dev->curr_ctx) + ret = m2m_dev->curr_ctx->priv; + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + + return ret; +} +EXPORT_SYMBOL(v4l2_m2m_get_curr_priv); + +/** + * v4l2_m2m_try_run() - select next job to perform and run it if possible + * + * Get next transaction (if present) from the waiting jobs list and run it. + */ +static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev) +{ + unsigned long flags; + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags); + if (NULL != m2m_dev->curr_ctx) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + dprintk("Another instance is running, won't run now\n"); + return; + } + + if (list_empty(&m2m_dev->job_queue)) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + dprintk("No job pending\n"); + return; + } + + m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue, + struct v4l2_m2m_ctx, queue); + m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING; + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + + m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv); +} + +/** + * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to + * the pending job queue and add it if so. + * @m2m_ctx: m2m context assigned to the instance to be checked + * + * There are three basic requirements an instance has to meet to be able to run: + * 1) at least one source buffer has to be queued, + * 2) at least one destination buffer has to be queued, + * 3) streaming has to be on. + * + * There may also be additional, custom requirements. In such case the driver + * should supply a custom callback (job_ready in v4l2_m2m_ops) that should + * return 1 if the instance is ready. + * An example of the above could be an instance that requires more than one + * src/dst buffer per transaction. + */ +static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) +{ + struct v4l2_m2m_dev *m2m_dev; + unsigned long flags_job, flags; + + m2m_dev = m2m_ctx->m2m_dev; + dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); + + if (!m2m_ctx->out_q_ctx.q.streaming + || !m2m_ctx->cap_q_ctx.q.streaming) { + dprintk("Streaming needs to be on for both queues\n"); + return; + } + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); + if (m2m_ctx->job_flags & TRANS_QUEUED) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); + dprintk("On job queue already\n"); + return; + } + + spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); + if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)) { + spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); + dprintk("No input buffers available\n"); + return; + } + if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)) { + spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); + dprintk("No output buffers available\n"); + return; + } + spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); + + if (m2m_dev->m2m_ops->job_ready + && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); + dprintk("Driver not ready\n"); + return; + } + + list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); + m2m_ctx->job_flags |= TRANS_QUEUED; + + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); + + v4l2_m2m_try_run(m2m_dev); +} + +/** + * v4l2_m2m_job_finish() - inform the framework that a job has been finished + * and have it clean up + * + * Called by a driver to yield back the device after it has finished with it. + * Should be called as soon as possible after reaching a state which allows + * other instances to take control of the device. + * + * This function has to be called only after device_run() callback has been + * called on the driver. To prevent recursion, it should not be called directly + * from the device_run() callback though. + */ +void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, + struct v4l2_m2m_ctx *m2m_ctx) +{ + unsigned long flags; + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags); + if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + dprintk("Called by an instance not currently running\n"); + return; + } + + list_del(&m2m_dev->curr_ctx->queue); + m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); + wake_up(&m2m_dev->curr_ctx->finished); + m2m_dev->curr_ctx = NULL; + + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + + /* This instance might have more buffers ready, but since we do not + * allow more than one job on the job_queue per instance, each has + * to be scheduled separately after the previous one finishes. */ + v4l2_m2m_try_schedule(m2m_ctx); + v4l2_m2m_try_run(m2m_dev); +} +EXPORT_SYMBOL(v4l2_m2m_job_finish); + +/** + * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer + */ +int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_requestbuffers *reqbufs) +{ + struct vb2_queue *vq; + + vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); + return vb2_reqbufs(vq, reqbufs); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); + +/** + * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer + * + * See v4l2_m2m_mmap() documentation for details. + */ +int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf) +{ + struct vb2_queue *vq; + int ret = 0; + unsigned int i; + + vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); + ret = vb2_querybuf(vq, buf); + + /* Adjust MMAP memory offsets for the CAPTURE queue */ + if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { + if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { + for (i = 0; i < buf->length; ++i) + buf->m.planes[i].m.mem_offset + += DST_QUEUE_OFF_BASE; + } else { + buf->m.offset += DST_QUEUE_OFF_BASE; + } + } + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); + +/** + * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on + * the type + */ +int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf) +{ + struct vb2_queue *vq; + int ret; + + vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); + ret = vb2_qbuf(vq, buf); + if (!ret) + v4l2_m2m_try_schedule(m2m_ctx); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); + +/** + * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on + * the type + */ +int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf) +{ + struct vb2_queue *vq; + + vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); + return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); + +/** + * v4l2_m2m_streamon() - turn on streaming for a video queue + */ +int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + struct vb2_queue *vq; + int ret; + + vq = v4l2_m2m_get_vq(m2m_ctx, type); + ret = vb2_streamon(vq, type); + if (!ret) + v4l2_m2m_try_schedule(m2m_ctx); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); + +/** + * v4l2_m2m_streamoff() - turn off streaming for a video queue + */ +int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type) +{ + struct vb2_queue *vq; + + vq = v4l2_m2m_get_vq(m2m_ctx, type); + return vb2_streamoff(vq, type); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); + +/** + * v4l2_m2m_poll() - poll replacement, for destination buffers only + * + * Call from the driver's poll() function. Will poll both queues. If a buffer + * is available to dequeue (with dqbuf) from the source queue, this will + * indicate that a non-blocking write can be performed, while read will be + * returned in case of the destination queue. + */ +unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct poll_table_struct *wait) +{ + struct video_device *vfd = video_devdata(file); + unsigned long req_events = poll_requested_events(wait); + struct vb2_queue *src_q, *dst_q; + struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; + unsigned int rc = 0; + unsigned long flags; + + if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { + struct v4l2_fh *fh = file->private_data; + + if (v4l2_event_pending(fh)) + rc = POLLPRI; + else if (req_events & POLLPRI) + poll_wait(file, &fh->wait, wait); + if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM))) + return rc; + } + + src_q = v4l2_m2m_get_src_vq(m2m_ctx); + dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); + + /* + * There has to be at least one buffer queued on each queued_list, which + * means either in driver already or waiting for driver to claim it + * and start processing. + */ + if ((!src_q->streaming || list_empty(&src_q->queued_list)) + && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { + rc |= POLLERR; + goto end; + } + + if (m2m_ctx->m2m_dev->m2m_ops->unlock) + m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); + + poll_wait(file, &src_q->done_wq, wait); + poll_wait(file, &dst_q->done_wq, wait); + + if (m2m_ctx->m2m_dev->m2m_ops->lock) + m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); + + spin_lock_irqsave(&src_q->done_lock, flags); + if (!list_empty(&src_q->done_list)) + src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, + done_entry); + if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE + || src_vb->state == VB2_BUF_STATE_ERROR)) + rc |= POLLOUT | POLLWRNORM; + spin_unlock_irqrestore(&src_q->done_lock, flags); + + spin_lock_irqsave(&dst_q->done_lock, flags); + if (!list_empty(&dst_q->done_list)) + dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, + done_entry); + if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE + || dst_vb->state == VB2_BUF_STATE_ERROR)) + rc |= POLLIN | POLLRDNORM; + spin_unlock_irqrestore(&dst_q->done_lock, flags); + +end: + return rc; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_poll); + +/** + * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer + * + * Call from driver's mmap() function. Will handle mmap() for both queues + * seamlessly for videobuffer, which will receive normal per-queue offsets and + * proper videobuf queue pointers. The differentiation is made outside videobuf + * by adding a predefined offset to buffers from one of the queues and + * subtracting it before passing it back to videobuf. Only drivers (and + * thus applications) receive modified offsets. + */ +int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct vm_area_struct *vma) +{ + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + struct vb2_queue *vq; + + if (offset < DST_QUEUE_OFF_BASE) { + vq = v4l2_m2m_get_src_vq(m2m_ctx); + } else { + vq = v4l2_m2m_get_dst_vq(m2m_ctx); + vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); + } + + return vb2_mmap(vq, vma); +} +EXPORT_SYMBOL(v4l2_m2m_mmap); + +/** + * v4l2_m2m_init() - initialize per-driver m2m data + * + * Usually called from driver's probe() function. + */ +struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops) +{ + struct v4l2_m2m_dev *m2m_dev; + + if (!m2m_ops) + return ERR_PTR(-EINVAL); + + BUG_ON(!m2m_ops->device_run); + BUG_ON(!m2m_ops->job_abort); + + m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); + if (!m2m_dev) + return ERR_PTR(-ENOMEM); + + m2m_dev->curr_ctx = NULL; + m2m_dev->m2m_ops = m2m_ops; + INIT_LIST_HEAD(&m2m_dev->job_queue); + spin_lock_init(&m2m_dev->job_spinlock); + + return m2m_dev; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_init); + +/** + * v4l2_m2m_release() - cleans up and frees a m2m_dev structure + * + * Usually called from driver's remove() function. + */ +void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) +{ + kfree(m2m_dev); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_release); + +/** + * v4l2_m2m_ctx_init() - allocate and initialize a m2m context + * @priv - driver's instance private data + * @m2m_dev - a previously initialized m2m_dev struct + * @vq_init - a callback for queue type-specific initialization function to be + * used for initializing videobuf_queues + * + * Usually called from driver's open() function. + */ +struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, + void *drv_priv, + int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) +{ + struct v4l2_m2m_ctx *m2m_ctx; + struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; + int ret; + + m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); + if (!m2m_ctx) + return ERR_PTR(-ENOMEM); + + m2m_ctx->priv = drv_priv; + m2m_ctx->m2m_dev = m2m_dev; + init_waitqueue_head(&m2m_ctx->finished); + + out_q_ctx = &m2m_ctx->out_q_ctx; + cap_q_ctx = &m2m_ctx->cap_q_ctx; + + INIT_LIST_HEAD(&out_q_ctx->rdy_queue); + INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); + spin_lock_init(&out_q_ctx->rdy_spinlock); + spin_lock_init(&cap_q_ctx->rdy_spinlock); + + INIT_LIST_HEAD(&m2m_ctx->queue); + + ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); + + if (ret) + goto err; + + return m2m_ctx; +err: + kfree(m2m_ctx); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); + +/** + * v4l2_m2m_ctx_release() - release m2m context + * + * Usually called from driver's release() function. + */ +void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) +{ + struct v4l2_m2m_dev *m2m_dev; + unsigned long flags; + + m2m_dev = m2m_ctx->m2m_dev; + + spin_lock_irqsave(&m2m_dev->job_spinlock, flags); + if (m2m_ctx->job_flags & TRANS_RUNNING) { + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); + dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); + wait_event(m2m_ctx->finished, !(m2m_ctx->job_flags & TRANS_RUNNING)); + } else if (m2m_ctx->job_flags & TRANS_QUEUED) { + list_del(&m2m_ctx->queue); + m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + dprintk("m2m_ctx: %p had been on queue and was removed\n", + m2m_ctx); + } else { + /* Do nothing, was not on queue/running */ + spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); + } + + vb2_queue_release(&m2m_ctx->cap_q_ctx.q); + vb2_queue_release(&m2m_ctx->out_q_ctx.q); + + kfree(m2m_ctx); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); + +/** + * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. + * + * Call from buf_queue(), videobuf_queue_ops callback. + */ +void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) +{ + struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); + struct v4l2_m2m_queue_ctx *q_ctx; + unsigned long flags; + + q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); + if (!q_ctx) + return; + + spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); + list_add_tail(&b->list, &q_ctx->rdy_queue); + q_ctx->num_rdy++; + spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); + |