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[media] vb2: convert vb2_vmarea_handler refcount from atomic_t to refcount_t

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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>
This commit is contained in:
Elena Reshetova 2017-03-06 11:21:00 -03:00 committed by Mauro Carvalho Chehab
parent a8d8e38a93
commit 6c4bb65d0b
5 changed files with 23 additions and 19 deletions
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11
drivers/media/v4l2-core/videobuf2-dma-contig.c
View File

@ -12,6 +12,7 @@
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/refcount.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
@ -34,7 +35,7 @@ struct vb2_dc_buf {
/* MMAP related */
struct vb2_vmarea_handler handler;
atomic_t refcount;
refcount_t refcount;
struct sg_table *sgt_base;
/* DMABUF related */
@ -86,7 +87,7 @@ static unsigned int vb2_dc_num_users(void *buf_priv)
{
struct vb2_dc_buf *buf = buf_priv;
return atomic_read(&buf->refcount);
return refcount_read(&buf->refcount);
}
static void vb2_dc_prepare(void *buf_priv)
@ -122,7 +123,7 @@ static void vb2_dc_put(void *buf_priv)
{
struct vb2_dc_buf *buf = buf_priv;
if (!atomic_dec_and_test(&buf->refcount))
if (!refcount_dec_and_test(&buf->refcount))
return;
if (buf->sgt_base) {
@ -170,7 +171,7 @@ static void *vb2_dc_alloc(struct device *dev, unsigned long attrs,
buf->handler.put = vb2_dc_put;
buf->handler.arg = buf;
atomic_inc(&buf->refcount);
refcount_set(&buf->refcount, 1);
return buf;
}
@ -407,7 +408,7 @@ static struct dma_buf *vb2_dc_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;
}

11
drivers/media/v4l2-core/videobuf2-dma-sg.c
View File

@ -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;
}

6
drivers/media/v4l2-core/videobuf2-memops.c
View File

@ -96,10 +96,10 @@ static void vb2_common_vm_open(struct vm_area_struct *vma)
struct vb2_vmarea_handler *h = vma->vm_private_data;
pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n",
__func__, h, atomic_read(h->refcount), vma->vm_start,
__func__, h, refcount_read(h->refcount), vma->vm_start,
vma->vm_end);
atomic_inc(h->refcount);
refcount_inc(h->refcount);
}
/**
@ -114,7 +114,7 @@ static void vb2_common_vm_close(struct vm_area_struct *vma)
struct vb2_vmarea_handler *h = vma->vm_private_data;
pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n",
__func__, h, atomic_read(h->refcount), vma->vm_start,
__func__, h, refcount_read(h->refcount), vma->vm_start,
vma->vm_end);
h->put(h->arg);

11
drivers/media/v4l2-core/videobuf2-vmalloc.c
View File

@ -13,6 +13,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/refcount.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@ -26,7 +27,7 @@ struct vb2_vmalloc_buf {
struct frame_vector *vec;
enum dma_data_direction dma_dir;
unsigned long size;
atomic_t refcount;
refcount_t refcount;
struct vb2_vmarea_handler handler;
struct dma_buf *dbuf;
};
@ -56,7 +57,7 @@ static void *vb2_vmalloc_alloc(struct device *dev, unsigned long attrs,
return ERR_PTR(-ENOMEM);
}
atomic_inc(&buf->refcount);
refcount_set(&buf->refcount, 1);
return buf;
}
@ -64,7 +65,7 @@ static void vb2_vmalloc_put(void *buf_priv)
{
struct vb2_vmalloc_buf *buf = buf_priv;
if (atomic_dec_and_test(&buf->refcount)) {
if (refcount_dec_and_test(&buf->refcount)) {
vfree(buf->vaddr);
kfree(buf);
}
@ -161,7 +162,7 @@ static void *vb2_vmalloc_vaddr(void *buf_priv)
static unsigned int vb2_vmalloc_num_users(void *buf_priv)
{
struct vb2_vmalloc_buf *buf = buf_priv;
return atomic_read(&buf->refcount);
return refcount_read(&buf->refcount);
}
static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma)
@ -368,7 +369,7 @@ static struct dma_buf *vb2_vmalloc_get_dmabuf(void *buf_priv, unsigned long flag
return NULL;
/* dmabuf keeps reference to vb2 buffer */
atomic_inc(&buf->refcount);
refcount_inc(&buf->refcount);
return dbuf;
}

3
include/media/videobuf2-memops.h
View File

@ -16,6 +16,7 @@
#include <media/videobuf2-v4l2.h>
#include <linux/mm.h>
#include <linux/refcount.h>
/**
* struct vb2_vmarea_handler - common vma refcount tracking handler
@ -25,7 +26,7 @@
* @arg: argument for @put callback
*/
struct vb2_vmarea_handler {
atomic_t *refcount;
refcount_t *refcount;
void (*put)(void *arg);
void *arg;
};