target/linux/bcm27xx/patches-5.10/950-0532-staging-vcsm-cma-Fix-memory-leak-from-not-detaching-.patch

   1 From db7b984f1957e5a26775a62a78e60df3f2da671f Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 4 Nov 2020 18:54:20 +0000
   4 Subject: [PATCH] staging: vcsm-cma: Fix memory leak from not detaching
   5  dmabuf
   6
   7 When importing there was a missing call to detach the buffer,
   8 so each import leaked the sg table entry.
   9
  10 Actually the release process for both locally allocated and
  11 imported buffers is identical, so fix them to both use the same
  12 function.
  13
  14 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  15 ---
  16  .../staging/vc04_services/vc-sm-cma/vc_sm.c   | 22 ++-----------------
  17  1 file changed, 2 insertions(+), 20 deletions(-)
  18
  19 --- a/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
  20 +++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
  21 @@ -237,6 +237,7 @@ static void vc_sm_add_resource(struct vc
  22
  23  /*
  24   * Cleans up imported dmabuf.
  25 + * Should be called with mutex held.
  26   */
  27  static void vc_sm_clean_up_dmabuf(struct vc_sm_buffer *buffer)
  28  {
  29 @@ -244,7 +245,6 @@ static void vc_sm_clean_up_dmabuf(struct
  30                 return;
  31
  32         /* Handle cleaning up imported dmabufs */
  33 -       mutex_lock(&buffer->lock);
  34         if (buffer->import.sgt) {
  35                 dma_buf_unmap_attachment(buffer->import.attach,
  36                                          buffer->import.sgt,
  37 @@ -255,7 +255,6 @@ static void vc_sm_clean_up_dmabuf(struct
  38                 dma_buf_detach(buffer->dma_buf, buffer->import.attach);
  39                 buffer->import.attach = NULL;
  40         }
  41 -       mutex_unlock(&buffer->lock);
  42  }
  43
  44  /*
  45 @@ -673,23 +672,6 @@ int vc_sm_import_dmabuf_mmap(struct dma_
  46  }
  47
  48  static
  49 -void vc_sm_import_dma_buf_release(struct dma_buf *dmabuf)
  50 -{
  51 -       struct vc_sm_buffer *buf = dmabuf->priv;
  52 -
  53 -       pr_debug("%s: Relasing dma_buf %p\n", __func__, dmabuf);
  54 -       mutex_lock(&buf->lock);
  55 -       if (!buf->imported)
  56 -               return;
  57 -
  58 -       buf->in_use = 0;
  59 -
  60 -       vc_sm_vpu_free(buf);
  61 -
  62 -       vc_sm_release_resource(buf);
  63 -}
  64 -
  65 -static
  66  int vc_sm_import_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
  67                                           enum dma_data_direction direction)
  68  {
  69 @@ -717,7 +699,7 @@ static const struct dma_buf_ops dma_buf_
  70         .map_dma_buf = vc_sm_import_map_dma_buf,
  71         .unmap_dma_buf = vc_sm_import_unmap_dma_buf,
  72         .mmap = vc_sm_import_dmabuf_mmap,
  73 -       .release = vc_sm_import_dma_buf_release,
  74 +       .release = vc_sm_dma_buf_release,
  75         .attach = vc_sm_import_dma_buf_attach,
  76         .detach = vc_sm_import_dma_buf_detatch,
  77         .begin_cpu_access = vc_sm_import_dma_buf_begin_cpu_access,