diff options
| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-06 11:21:00 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-04-05 15:31:57 -0300 |
| commit | 6c4bb65d0be8f34bc0aba982c9a47b19a1eea5ed (patch) | |
| tree | 37e956f83c6ba7e2870172f6c540b3a3a4f9aee9 /drivers/media/v4l2-core/videobuf2-dma-sg.c | |
| parent | a8d8e38a9337cc6b46ef6c66db65130fb61050dd (diff) | |
[media] vb2: convert vb2_vmarea_handler refcount from atomic_t to refcount_t
Use refcount_t to manage the refcount to the memory type specific buffer
videobuf2 buffer implementations. refcount_t is better suitable for the
purpose than atomic_t.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-dma-sg.c')
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-dma-sg.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c index ecff8f492c4f..29fde1a58a79 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/mm.h> +#include <linux/refcount.h> #include <linux/scatterlist.h> #include <linux/sched.h> #include <linux/slab.h> @@ -46,7 +47,7 @@ struct vb2_dma_sg_buf { struct sg_table *dma_sgt; size_t size; unsigned int num_pages; - atomic_t refcount; + refcount_t refcount; struct vb2_vmarea_handler handler; struct dma_buf_attachment *db_attach; @@ -150,7 +151,7 @@ static void *vb2_dma_sg_alloc(struct device *dev, unsigned long dma_attrs, buf->handler.put = vb2_dma_sg_put; buf->handler.arg = buf; - atomic_inc(&buf->refcount); + refcount_set(&buf->refcount, 1); dprintk(1, "%s: Allocated buffer of %d pages\n", __func__, buf->num_pages); @@ -176,7 +177,7 @@ static void vb2_dma_sg_put(void *buf_priv) struct sg_table *sgt = &buf->sg_table; int i = buf->num_pages; - if (atomic_dec_and_test(&buf->refcount)) { + if (refcount_dec_and_test(&buf->refcount)) { dprintk(1, "%s: Freeing buffer of %d pages\n", __func__, buf->num_pages); dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, @@ -320,7 +321,7 @@ static unsigned int vb2_dma_sg_num_users(void *buf_priv) { struct vb2_dma_sg_buf *buf = buf_priv; - return atomic_read(&buf->refcount); + return refcount_read(&buf->refcount); } static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma) @@ -530,7 +531,7 @@ static struct dma_buf *vb2_dma_sg_get_dmabuf(void *buf_priv, unsigned long flags return NULL; /* dmabuf keeps reference to vb2 buffer */ - atomic_inc(&buf->refcount); + refcount_inc(&buf->refcount); return dbuf; } |