drm/amd/display: fix null pointer deref error
[Why]
0 was passed in place of a pointer which triggered null pointer
dereference.
Causes a backtrace like:
[ 41.159466] RIP: 0010:dccg31_set_audio_dtbclk_dto+0x10/0x120 [amdgpu]
[ 41.159928] Code: c0 00 00 00 6a 01 8b 92 84 01 00 00 52 0f b6 40 61 e9 30 ff ff ff 0f 1f 40 00 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 41 54 53 <44> 8b 66 18 48 89 fb 48 8b 47 30 48 8b 3f 45 85 e4 74 09 4c 63 6e
[ 41.159932] RSP: 0018:
ffffaee54055afd0 EFLAGS:
00010246
[ 41.159936] RAX:
0000000000000000 RBX:
0000000000000000 RCX:
ffff917445901800
[ 41.159939] RDX:
ffffffffc15e6ca0 RSI:
0000000000000000 RDI:
ffff91744dbd8c60
[ 41.159941] RBP:
ffffaee54055aff0 R08:
0000000000000100 R09:
ffffaee54055afe8
[ 41.159944] R10:
0000000000000001 R11:
0000000000000009 R12:
ffff91747ca201f0
[ 41.159946] R13:
ffff91747ca20000 R14:
ffff917448720438 R15:
ffff91747ca20000
[ 41.159948] FS:
00007f5e13e5f740(0000) GS:
ffff91775ca40000(0000) knlGS:
0000000000000000
[ 41.159951] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[ 41.159954] CR2:
0000000000000018 CR3:
000000010fea0000 CR4:
00000000003506e0
[ 41.159956] Call Trace:
[ 41.159959] <TASK>
[ 41.159964] dce110_setup_audio_dto.isra.0+0xd8/0x1f0 [amdgpu]
[ 41.160411] dce110_apply_ctx_to_hw+0x1aa/0x780 [amdgpu]
[ 41.160842] ? __free_pages+0x88/0xb0
[ 41.160850] ? kfree+0x360/0x3e0
[ 41.160857] dc_commit_state+0x337/0xac0 [amdgpu]
[ 41.161135] amdgpu_dm_atomic_commit_tail+0x5e3/0x2680 [amdgpu]
[How]
Pass in a pointer that contains nullified parameters instead of null
pointer.
Fixes:
405bb9eea36a ("drm/amd/display: Implement DTBCLK ref switching on dcn32")
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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