udmabuf: add a pointer to the miscdevice in dma-buf private data

Will be used later.

v2: rename 'udmabuf_misc' to 'device' (kraxel)

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20191203013627.85991-2-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index be15eb6..f0bf3ba 100644 (file)
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -18,6 +18,7 @@ static const size_t size_limit_mb = 64; /* total dmabuf size, in megabytes  */
 struct udmabuf {
        pgoff_t pagecount;
        struct page **pages;
+       struct miscdevice *device;
 };
 
 static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf)
@@ -104,8 +105,9 @@ static const struct dma_buf_ops udmabuf_ops = {
 #define SEALS_WANTED (F_SEAL_SHRINK)
 #define SEALS_DENIED (F_SEAL_WRITE)
 
-static long udmabuf_create(const struct udmabuf_create_list *head,
-                          const struct udmabuf_create_item *list)
+static long udmabuf_create(struct miscdevice *device,
+                          struct udmabuf_create_list *head,
+                          struct udmabuf_create_item *list)
 {
        DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
        struct file *memfd = NULL;
@@ -172,6 +174,7 @@ static long udmabuf_create(const struct udmabuf_create_list *head,
        exp_info.priv = ubuf;
        exp_info.flags = O_RDWR;
 
+       ubuf->device = device;
        buf = dma_buf_export(&exp_info);
        if (IS_ERR(buf)) {
                ret = PTR_ERR(buf);
@@ -209,7 +212,7 @@ static long udmabuf_ioctl_create(struct file *filp, unsigned long arg)
        list.offset = create.offset;
        list.size   = create.size;
 
-       return udmabuf_create(&head, &list);
+       return udmabuf_create(filp->private_data, &head, &list);
 }
 
 static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg)
@@ -228,7 +231,7 @@ static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg)
        if (IS_ERR(list))
                return PTR_ERR(list);
 
-       ret = udmabuf_create(&head, list);
+       ret = udmabuf_create(filp->private_data, &head, list);
        kfree(list);
        return ret;
 }