target/linux/bcm27xx/patches-5.15/950-0879-drm-vc4_kms-Protect-hvs-dereference-on-fkms.patch

   1 From 02e41ddac8a960df7defaa377c1d3d981ac0a652 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Wed, 27 Apr 2022 14:45:35 +0100
   4 Subject: [PATCH] drm/vc4_kms: Protect hvs dereference on fkms
   5
   6 fkms has a null hvs pointer so this crashes. Protect against it
   7
   8 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
   9 ---
  10  drivers/gpu/drm/vc4/vc4_kms.c | 2 +-
  11  1 file changed, 1 insertion(+), 1 deletion(-)
  12
  13 --- a/drivers/gpu/drm/vc4/vc4_kms.c
  14 +++ b/drivers/gpu/drm/vc4/vc4_kms.c
  15 @@ -354,7 +354,7 @@ static void vc4_atomic_commit_tail(struc
  16         struct vc4_hvs_state *new_hvs_state;
  17         struct drm_crtc *crtc;
  18         struct vc4_hvs_state *old_hvs_state;
  19 -       unsigned long max_clock_rate = clk_get_max_rate(hvs->core_clk);
  20 +       unsigned long max_clock_rate = hvs ? clk_get_max_rate(hvs->core_clk) : 0;
  21         unsigned int channel;
  22         int i;
  23