target/linux/bcm27xx/patches-4.19/950-0745-staging-bcm2835-codec-Fix-imbalance-in-dma_buf_get-d.patch

   1 From 4542b5d7b4e00b11dd37d93986b624c58b198765 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Mon, 7 Oct 2019 14:02:57 +0100
   4 Subject: [PATCH] staging: bcm2835-codec: Fix imbalance in
   5  dma_buf_get/dma_buf_put
   6
   7 When represented with a dmabuf buffer that had previously been
   8 imported, there was a call to dma_buf_get without a matching
   9 dma_buf_put. This left dmabufs in limbo after all users had
  10 supposedly released them.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  13 ---
  14  .../staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c | 5 +++++
  15  1 file changed, 5 insertions(+)
  16
  17 --- a/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
  18 +++ b/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
  19 @@ -2112,6 +2112,11 @@ static int bcm2835_codec_buf_prepare(str
  20                         }
  21
  22                         buf->mmal.dma_buf = dma_buf;
  23 +               } else {
  24 +                       /* We already have a reference count on the dmabuf, so
  25 +                        * release the one we acquired above.
  26 +                        */
  27 +                       dma_buf_put(dma_buf);
  28                 }
  29                 ret = 0;
  30                 break;