target/linux/bcm27xx/patches-6.1/950-0928-vc4_drv-Avoid-panic-when-booted-with-no-kms.patch

   1 From 0f5fd4538774aa6c936bb8fc78611c3113bf19d7 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Mon, 17 Apr 2023 15:21:41 +0100
   4 Subject: [PATCH] vc4_drv: Avoid panic when booted with no kms
   5
   6 If kms/fkms overlay is not present we have no matching drivers
   7 and so match is NULL.
   8
   9 It is not safe to call component_master_add_with_match with a null match argument.
  10
  11 So don't do that
  12
  13 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
  14 ---
  15  drivers/gpu/drm/vc4/vc4_drv.c | 3 +++
  16  1 file changed, 3 insertions(+)
  17
  18 --- a/drivers/gpu/drm/vc4/vc4_drv.c
  19 +++ b/drivers/gpu/drm/vc4/vc4_drv.c
  20 @@ -456,6 +456,9 @@ static int vc4_platform_drm_probe(struct
  21         vc4_match_add_drivers(dev, &match,
  22                               component_drivers, ARRAY_SIZE(component_drivers));
  23
  24 +       if (!match)
  25 +               return -ENODEV;
  26 +
  27         return component_master_add_with_match(dev, &vc4_drm_ops, match);
  28  }
  29