target/linux/bcm27xx/patches-5.4/950-0728-udmabuf-add-a-pointer-to-the-miscdevice-in-dma-buf-p.patch

   1 From ad21bb0b5abf5414e31ac3e41ff60216bee52982 Mon Sep 17 00:00:00 2001
   2 From: Gurchetan Singh <gurchetansingh@chromium.org>
   3 Date: Mon, 2 Dec 2019 17:36:25 -0800
   4 Subject: [PATCH] udmabuf: add a pointer to the miscdevice in dma-buf
   5  private data
   6
   7 Commit c1bbed668997268c9edccdc9db1bd1487d9e20b0 upstream.
   8
   9 Will be used later.
  10
  11 v2: rename 'udmabuf_misc' to 'device' (kraxel)
  12
  13 Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
  14 Link: http://patchwork.freedesktop.org/patch/msgid/20191203013627.85991-2-gurchetansingh@chromium.org
  15 Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
  16 ---
  17  drivers/dma-buf/udmabuf.c | 11 +++++++----
  18  1 file changed, 7 insertions(+), 4 deletions(-)
  19
  20 --- a/drivers/dma-buf/udmabuf.c
  21 +++ b/drivers/dma-buf/udmabuf.c
  22 @@ -18,6 +18,7 @@ static const size_t size_limit_mb = 64;
  23  struct udmabuf {
  24         pgoff_t pagecount;
  25         struct page **pages;
  26 +       struct miscdevice *device;
  27  };
  28
  29  static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf)
  30 @@ -104,8 +105,9 @@ static const struct dma_buf_ops udmabuf_
  31  #define SEALS_WANTED (F_SEAL_SHRINK)
  32  #define SEALS_DENIED (F_SEAL_WRITE)
  33
  34 -static long udmabuf_create(const struct udmabuf_create_list *head,
  35 -                          const struct udmabuf_create_item *list)
  36 +static long udmabuf_create(struct miscdevice *device,
  37 +                          struct udmabuf_create_list *head,
  38 +                          struct udmabuf_create_item *list)
  39  {
  40         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
  41         struct file *memfd = NULL;
  42 @@ -172,6 +174,7 @@ static long udmabuf_create(const struct
  43         exp_info.priv = ubuf;
  44         exp_info.flags = O_RDWR;
  45
  46 +       ubuf->device = device;
  47         buf = dma_buf_export(&exp_info);
  48         if (IS_ERR(buf)) {
  49                 ret = PTR_ERR(buf);
  50 @@ -209,7 +212,7 @@ static long udmabuf_ioctl_create(struct
  51         list.offset = create.offset;
  52         list.size   = create.size;
  53
  54 -       return udmabuf_create(&head, &list);
  55 +       return udmabuf_create(filp->private_data, &head, &list);
  56  }
  57
  58  static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg)
  59 @@ -228,7 +231,7 @@ static long udmabuf_ioctl_create_list(st
  60         if (IS_ERR(list))
  61                 return PTR_ERR(list);
  62
  63 -       ret = udmabuf_create(&head, list);
  64 +       ret = udmabuf_create(filp->private_data, &head, list);
  65         kfree(list);
  66         return ret;
  67  }