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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2018-06-26 09:26:52 -0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-07-25 08:10:31 -0400 |
| commit | ee1228cca15ce097b7badebfdd0fef23a2cca9e1 (patch) | |
| tree | 21a2a345180ad0a86e4faa9f2cca1d514909c7fe /drivers/media/v4l2-core | |
| parent | 62c3fce04154777e6a3ce3a27f123b645d36dcff (diff) | |
| download | linux-ee1228cca15ce097b7badebfdd0fef23a2cca9e1.tar.gz linux-ee1228cca15ce097b7badebfdd0fef23a2cca9e1.tar.bz2 linux-ee1228cca15ce097b7badebfdd0fef23a2cca9e1.zip | |
media: v4l2-mem2mem: add v4l2_m2m_last_buf()
This can be used to mark the last queued source buffer as the last
buffer.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-mem2mem.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c index 4aeedb91594a..d9565ee44578 100644 --- a/drivers/media/v4l2-core/v4l2-mem2mem.c +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c @@ -129,6 +129,24 @@ void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) } EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); +void *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx) +{ + struct v4l2_m2m_buffer *b; + 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_last_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_last_buf); + void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) { struct v4l2_m2m_buffer *b; |