From: Hans Verkuil <hans.verk...@cisco.com>
This ops can never fail, so make these void functions.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
drivers/media/v4l2-core/videobuf2-core.c | 27 ++++++++++++---------------
drivers/media/v4l2-core/videobuf2-v4l2.c | 12 +++++-------
include/media/videobuf2-core.h | 17 ++++++++++++++---
3 files changed, 31 insertions(+), 25 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c
b/drivers/media/v4l2-core/videobuf2-core.c
index 4faa066..5cd418e 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -178,6 +178,12 @@ module_param(debug, int, 0644);
ret; \
})
+#define call_void_bufop(q, op, args...)
\
+({ \
+ if (q && q->buf_ops && q->buf_ops->op) \
+ q->buf_ops->op(args); \
+})
+
static void __vb2_queue_cancel(struct vb2_queue *q);
static void __enqueue_in_driver(struct vb2_buffer *vb);
@@ -586,13 +592,10 @@ static bool __buffers_in_use(struct vb2_queue *q)
* Should be called from vidioc_querybuf ioctl handler in driver.
* The passed buffer should have been verified.
* This function fills the relevant information for the userspace.
- *
- * The return values from this function are intended to be directly returned
- * from vidioc_querybuf handler in driver.
*/
-int vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb)
+void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb)
{
- return call_bufop(q, fill_user_buffer, q->bufs[index], pb);
+ call_void_bufop(q, fill_user_buffer, q->bufs[index], pb);
}
EXPORT_SYMBOL_GPL(vb2_core_querybuf);
@@ -1420,9 +1423,7 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned
int index, void *pb)
return ret;
/* Fill buffer information for the userspace */
- ret = call_bufop(q, fill_user_buffer, vb, pb);
- if (ret)
- return ret;
+ call_void_bufop(q, fill_user_buffer, vb, pb);
dprintk(1, "prepare of buffer %d succeeded\n", vb->index);
@@ -1543,7 +1544,7 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int
index, void *pb)
q->waiting_for_buffers = false;
vb->state = VB2_BUF_STATE_QUEUED;
- call_bufop(q, copy_timestamp, vb, pb);
+ call_void_bufop(q, copy_timestamp, vb, pb);
trace_vb2_qbuf(q, vb);
@@ -1555,9 +1556,7 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int
index, void *pb)
__enqueue_in_driver(vb);
/* Fill buffer information for the userspace */
- ret = call_bufop(q, fill_user_buffer, vb, pb);
- if (ret)
- return ret;
+ call_void_bufop(q, fill_user_buffer, vb, pb);
/*
* If streamon has been called, and we haven't yet called
@@ -1780,9 +1779,7 @@ int vb2_core_dqbuf(struct vb2_queue *q, void *pb, bool
nonblocking)
call_void_vb_qop(vb, buf_finish, vb);
/* Fill buffer information for the userspace */
- ret = call_bufop(q, fill_user_buffer, vb, pb);
- if (ret)
- return ret;
+ call_void_bufop(q, fill_user_buffer, vb, pb);
/* Remove from videobuf queue */
list_del(&vb->queued_entry);
diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c
b/drivers/media/v4l2-core/videobuf2-v4l2.c
index f17b9cf..c9a2860 100644
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -114,7 +114,7 @@ static int __verify_length(struct vb2_buffer *vb, const
struct v4l2_buffer *b)
return 0;
}
-static int __copy_timestamp(struct vb2_buffer *vb, const void *pb)
+static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
{
const struct v4l2_buffer *b = pb;
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
@@ -131,7 +131,6 @@ static int __copy_timestamp(struct vb2_buffer *vb, const
void *pb)
if (b->flags & V4L2_BUF_FLAG_TIMECODE)
vbuf->timecode = b->timecode;
}
- return 0;
};
static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
@@ -182,7 +181,7 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q,
struct v4l2_buffer *b,
* __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
* returned to userspace
*/
-static int __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
+static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
{
struct v4l2_buffer *b = pb;
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
@@ -281,8 +280,6 @@ static int __fill_v4l2_buffer(struct vb2_buffer *vb, void
*pb)
b->flags & V4L2_BUF_FLAG_DONE &&
b->flags & V4L2_BUF_FLAG_LAST)
q->last_buffer_dequeued = true;
-
- return 0;
}
/**
@@ -474,8 +471,9 @@ int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
}
vb = q->bufs[b->index];
ret = __verify_planes_array(vb, b);
-
- return ret ? ret : vb2_core_querybuf(q, b->index, b);
+ if (!ret)
+ vb2_core_querybuf(q, b->index, b);
+ return ret;
}
EXPORT_SYMBOL(vb2_querybuf);
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index cc94c9d..b88dbba 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -369,11 +369,22 @@ struct vb2_ops {
void (*buf_queue)(struct vb2_buffer *vb);
};
+/**
+ * struct vb2_ops - driver-specific callbacks
+ *
+ * @fill_user_buffer: given a vb2_buffer fill in the userspace structure.
+ * For V4L2 this is a struct v4l2_buffer.
+ * @fill_vb2_buffer: given a userspace structure, fill in the vb2_buffer.
+ * If the userspace structure is invalid, then this op
+ * will return an error.
+ * @copy_timestamp: copy the timestamp from a userspace structure to
+ * the vb2_buffer struct.
+ */
struct vb2_buf_ops {
- int (*fill_user_buffer)(struct vb2_buffer *vb, void *pb);
+ void (*fill_user_buffer)(struct vb2_buffer *vb, void *pb);
int (*fill_vb2_buffer)(struct vb2_buffer *vb, const void *pb,
struct vb2_plane *planes);
- int (*copy_timestamp)(struct vb2_buffer *vb, const void *pb);
+ void (*copy_timestamp)(struct vb2_buffer *vb, const void *pb);
};
/**
@@ -512,7 +523,7 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum
vb2_buffer_state state);
void vb2_discard_done(struct vb2_queue *q);
int vb2_wait_for_all_buffers(struct vb2_queue *q);
-int vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
+void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int *count);
int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
--
2.6.2
--
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