[media] vb2: replace 'write' by 'dma_dir'

The 'write' argument is very ambiguous. I first assumed that if it is 1,
then we're doing video output but instead it meant the reverse.

Since it is used to setup the dma_dir value anyway it is now replaced by
the correct dma_dir value which is unambiguous.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

4 files changed, 43 insertions, 36 deletions

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index f2e43de3dd87..573f6fb9b40f 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1358,7 +1358,8 @@ static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b)
         void *mem_priv;
         unsigned int plane;
         int ret;
-        int write = !V4L2_TYPE_IS_OUTPUT(q->type);
+        enum dma_data_direction dma_dir =
+                V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
         bool reacquired = vb->planes[0].mem_priv == NULL;
 
         memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
@@ -1400,7 +1401,7 @@ static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b)
                 /* Acquire each plane's memory */
                 mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane],
                                       planes[plane].m.userptr,
-                                      planes[plane].length, write);
+                                      planes[plane].length, dma_dir);
                 if (IS_ERR_OR_NULL(mem_priv)) {
                         dprintk(1, "failed acquiring userspace "
                                                 "memory for plane %d\n", plane);
@@ -1461,7 +1462,8 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b)
         void *mem_priv;
         unsigned int plane;
         int ret;
-        int write = !V4L2_TYPE_IS_OUTPUT(q->type);
+        enum dma_data_direction dma_dir =
+                V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
         bool reacquired = vb->planes[0].mem_priv == NULL;
 
         memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
@@ -1509,7 +1511,7 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b)
 
                 /* Acquire each plane's memory */
                 mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane],
-                        dbuf, planes[plane].length, write);
+                        dbuf, planes[plane].length, dma_dir);
                 if (IS_ERR(mem_priv)) {
                         dprintk(1, "failed to attach dmabuf\n");
                         ret = PTR_ERR(mem_priv);
diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index 4a02ade14b4f..2bdffd383572 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -229,7 +229,7 @@ static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma)
 
 struct vb2_dc_attachment {
         struct sg_table sgt;
-        enum dma_data_direction dir;
+        enum dma_data_direction dma_dir;
 };
 
 static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev,
@@ -264,7 +264,7 @@ static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev,
                 wr = sg_next(wr);
         }
 
-        attach->dir = DMA_NONE;
+        attach->dma_dir = DMA_NONE;
         dbuf_attach->priv = attach;
 
         return 0;
@@ -282,16 +282,16 @@ static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf,
         sgt = &attach->sgt;
 
         /* release the scatterlist cache */
-        if (attach->dir != DMA_NONE)
+        if (attach->dma_dir != DMA_NONE)
                 dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
-                        attach->dir);
+                        attach->dma_dir);
         sg_free_table(sgt);
         kfree(attach);
         db_attach->priv = NULL;
 }
 
 static struct sg_table *vb2_dc_dmabuf_ops_map(
-        struct dma_buf_attachment *db_attach, enum dma_data_direction dir)
+        struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
 {
         struct vb2_dc_attachment *attach = db_attach->priv;
         /* stealing dmabuf mutex to serialize map/unmap operations */
@@ -303,27 +303,27 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
 
         sgt = &attach->sgt;
         /* return previously mapped sg table */
-        if (attach->dir == dir) {
+        if (attach->dma_dir == dma_dir) {
                 mutex_unlock(lock);
                 return sgt;
         }
 
         /* release any previous cache */
-        if (attach->dir != DMA_NONE) {
+        if (attach->dma_dir != DMA_NONE) {
                 dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
-                        attach->dir);
-                attach->dir = DMA_NONE;
+                        attach->dma_dir);
+                attach->dma_dir = DMA_NONE;
         }
 
         /* mapping to the client with new direction */
-        ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dir);
+        ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dma_dir);
         if (ret <= 0) {
                 pr_err("failed to map scatterlist\n");
                 mutex_unlock(lock);
                 return ERR_PTR(-EIO);
         }
 
-        attach->dir = dir;
+        attach->dma_dir = dma_dir;
 
         mutex_unlock(lock);
 
@@ -331,7 +331,7 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
 }
 
 static void vb2_dc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach,
-        struct sg_table *sgt, enum dma_data_direction dir)
+        struct sg_table *sgt, enum dma_data_direction dma_dir)
 {
         /* nothing to be done here */
 }
@@ -460,7 +460,8 @@ static int vb2_dc_get_user_pfn(unsigned long start, int n_pages,
 }
 
 static int vb2_dc_get_user_pages(unsigned long start, struct page **pages,
-        int n_pages, struct vm_area_struct *vma, int write)
+        int n_pages, struct vm_area_struct *vma,
+        enum dma_data_direction dma_dir)
 {
         if (vma_is_io(vma)) {
                 unsigned int i;
@@ -482,7 +483,7 @@ static int vb2_dc_get_user_pages(unsigned long start, struct page **pages,
                 int n;
 
                 n = get_user_pages(current, current->mm, start & PAGE_MASK,
-                        n_pages, write, 1, pages, NULL);
+                        n_pages, dma_dir == DMA_FROM_DEVICE, 1, pages, NULL);
                 /* negative error means that no page was pinned */
                 n = max(n, 0);
                 if (n != n_pages) {
@@ -551,7 +552,7 @@ static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn
 #endif
 
 static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
-        unsigned long size, int write)
+        unsigned long size, enum dma_data_direction dma_dir)
 {
         struct vb2_dc_conf *conf = alloc_ctx;
         struct vb2_dc_buf *buf;
@@ -582,7 +583,7 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
                 return ERR_PTR(-ENOMEM);
 
         buf->dev = conf->dev;
-        buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+        buf->dma_dir = dma_dir;
 
         start = vaddr & PAGE_MASK;
         offset = vaddr & ~PAGE_MASK;
@@ -618,7 +619,8 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
         }
 
         /* extract page list from userspace mapping */
-        ret = vb2_dc_get_user_pages(start, pages, n_pages, vma, write);
+        ret = vb2_dc_get_user_pages(start, pages, n_pages, vma,
+                                    dma_dir == DMA_FROM_DEVICE);
         if (ret) {
                 unsigned long pfn;
                 if (vb2_dc_get_user_pfn(start, n_pages, vma, &pfn) == 0) {
@@ -782,7 +784,7 @@ static void vb2_dc_detach_dmabuf(void *mem_priv)
 }
 
 static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
-        unsigned long size, int write)
+        unsigned long size, enum dma_data_direction dma_dir)
 {
         struct vb2_dc_conf *conf = alloc_ctx;
         struct vb2_dc_buf *buf;
@@ -804,7 +806,7 @@ static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
                 return dba;
         }
 
-        buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+        buf->dma_dir = dma_dir;
         buf->size = size;
         buf->db_attach = dba;
 
diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
index 9b163a440f89..6b54a14ee827 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -33,8 +33,8 @@ module_param(debug, int, 0644);
 struct vb2_dma_sg_buf {
         void                            *vaddr;
         struct page                     **pages;
-        int                             write;
         int                             offset;
+        enum dma_data_direction         dma_dir;
         struct sg_table                 sg_table;
         size_t                          size;
         unsigned int                    num_pages;
@@ -97,7 +97,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_fla
                 return NULL;
 
         buf->vaddr = NULL;
-        buf->write = 0;
+        buf->dma_dir = DMA_NONE;
         buf->offset = 0;
         buf->size = size;
         /* size is already page aligned */
@@ -162,7 +162,8 @@ static inline int vma_is_io(struct vm_area_struct *vma)
 }
 
 static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
-                                    unsigned long size, int write)
+                                    unsigned long size,
+                                    enum dma_data_direction dma_dir)
 {
         struct vb2_dma_sg_buf *buf;
         unsigned long first, last;
@@ -174,7 +175,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
                 return NULL;
 
         buf->vaddr = NULL;
-        buf->write = write;
+        buf->dma_dir = dma_dir;
         buf->offset = vaddr & ~PAGE_MASK;
         buf->size = size;
 
@@ -221,7 +222,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
                 num_pages_from_user = get_user_pages(current, current->mm,
                                              vaddr & PAGE_MASK,
                                              buf->num_pages,
-                                             write,
+                                             buf->dma_dir == DMA_FROM_DEVICE,
                                              1, /* force */
                                              buf->pages,
                                              NULL);
@@ -265,7 +266,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
                 vm_unmap_ram(buf->vaddr, buf->num_pages);
         sg_free_table(&buf->sg_table);
         while (--i >= 0) {
-                if (buf->write)
+                if (buf->dma_dir == DMA_FROM_DEVICE)
                         set_page_dirty_lock(buf->pages[i]);
                 if (!vma_is_io(buf->vma))
                         put_page(buf->pages[i]);
diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index 313d9771b2bc..fc1eb45a6143 100644
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
@@ -25,7 +25,7 @@ struct vb2_vmalloc_buf {
         void                            *vaddr;
         struct page                     **pages;
         struct vm_area_struct           *vma;
-        int                             write;
+        enum dma_data_direction         dma_dir;
         unsigned long                   size;
         unsigned int                    n_pages;
         atomic_t                        refcount;
@@ -70,7 +70,8 @@ static void vb2_vmalloc_put(void *buf_priv)
 }
 
 static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
-                                     unsigned long size, int write)
+                                     unsigned long size,
+                                     enum dma_data_direction dma_dir)
 {
         struct vb2_vmalloc_buf *buf;
         unsigned long first, last;
@@ -82,7 +83,7 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
         if (!buf)
                 return NULL;
 
-        buf->write = write;
+        buf->dma_dir = dma_dir;
         offset = vaddr & ~PAGE_MASK;
         buf->size = size;
 
@@ -107,7 +108,8 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
                 /* current->mm->mmap_sem is taken by videobuf2 core */
                 n_pages = get_user_pages(current, current->mm,
                                          vaddr & PAGE_MASK, buf->n_pages,
-                                         write, 1, /* force */
+                                         dma_dir == DMA_FROM_DEVICE,
+                                         1, /* force */
                                          buf->pages, NULL);
                 if (n_pages != buf->n_pages)
                         goto fail_get_user_pages;
@@ -144,7 +146,7 @@ static void vb2_vmalloc_put_userptr(void *buf_priv)
                 if (vaddr)
                         vm_unmap_ram((void *)vaddr, buf->n_pages);
                 for (i = 0; i < buf->n_pages; ++i) {
-                        if (buf->write)
+                        if (buf->dma_dir == DMA_FROM_DEVICE)
                                 set_page_dirty_lock(buf->pages[i]);
                         put_page(buf->pages[i]);
                 }
@@ -240,7 +242,7 @@ static void vb2_vmalloc_detach_dmabuf(void *mem_priv)
 }
 
 static void *vb2_vmalloc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
-        unsigned long size, int write)
+        unsigned long size, enum dma_data_direction dma_dir)
 {
         struct vb2_vmalloc_buf *buf;
 
@@ -252,7 +254,7 @@ static void *vb2_vmalloc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
                 return ERR_PTR(-ENOMEM);
 
         buf->dbuf = dbuf;
-        buf->write = write;
+        buf->dma_dir = dma_dir;
         buf->size = size;
 
         return buf;