af23aee9e9
[Why&How] Fix the null pointer dererefence error when rotating the monitor on a DCN32 variant, which causes a call trace like: [ 42.469548] RIP: 0010:dcn20_program_front_end_for_ctx.cold+0x68/0x435 [amdgpu] [ 42.477140] Code: c1 4c 01 e8 48 8b b0 f0 01 00 00 e8 b6 1c 4c f9 42 f6 84 2b a0 0a 00 00 02 74 30 4d 03 ac 24 68 04 00 00 49 8b 85 f0 01 00 00 <83> b8 50 06 00 00 02 75 18 49 8b bd e0 02 00 00 48 8b 07 48 8b 40 [ 42.496225] RSP: 0018:ffffaf744326f6a0 EFLAGS: 00010282 [ 42.501539] RAX: 0000000000000000 RBX: ffff948765180000 RCX: 0000000000000000 [ 42.508797] RDX: 0000000000000000 RSI: ffffffffbaea5329 RDI: 00000000ffffffff [ 42.516055] RBP: ffff948701674400 R08: 0000000000000000 R09: ffffaf744326f538 [ 42.523312] R10: 0000000000000003 R11: ffff948a1d33ffe8 R12: ffff948708700000 [ 42.530569] R13: ffff94876e901180 R14: 0000000000000002 R15: 0000000000000001 [ 42.537825] FS: 00007f1c7c04a5c0(0000) GS:ffff948a05a80000(0000) knlGS:0000000000000000 [ 42.546055] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.551898] CR2: 0000000000000650 CR3: 0000000127dd6000 CR4: 00000000003506e0 [ 42.559155] Call Trace: [ 42.561645] <TASK> [ 42.563782] commit_planes_for_stream+0x8b1/0x1410 [amdgpu 2059945d14fb66c82032430b723fcb84d8250d46] [ 42.573298] dc_update_planes_and_stream+0x3f9/0x9f0 [amdgpu 2059945d14fb66c82032430b723fcb84d8250d46] [ 42.582986] amdgpu_dm_atomic_commit_tail+0x19be/0x3270 [amdgpu 2059945d14fb66c82032430b723fcb84d8250d46] [ 42.592944] ? vsnprintf+0x35e/0x550 [ 42.596593] commit_tail+0x94/0x130 [ 42.600146] drm_atomic_helper_commit+0x112/0x140 [ 42.604931] drm_atomic_commit+0x96/0xc0 [ 42.608922] ? drm_plane_get_damage_clips.cold+0x1c/0x1c [ 42.614326] drm_mode_atomic_ioctl+0x97b/0xb90 [ 42.618848] ? drm_atomic_set_property+0xb40/0xb40 [ 42.623633] drm_ioctl_kernel+0xc9/0x170 [ 42.627694] drm_ioctl+0x22f/0x410 [ 42.631157] ? drm_atomic_set_property+0xb40/0xb40 [ 42.636031] amdgpu_drm_ioctl+0x4a/0x80 [amdgpu 2059945d14fb66c82032430b723fcb84d8250d46] [ 42.644537] __x64_sys_ioctl+0x90/0xd0 [ 42.648355] do_syscall_64+0x5b/0x80 [ 42.651992] ? do_syscall_64+0x67/0x80 [ 42.655808] ? exit_to_user_mode_prepare+0x1e/0x140 [ 42.660773] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 42.665913] RIP: 0033:0x7f1c7f31aaff [ 42.669550] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 77 1f 48 8b 44 24 18 64 48 2b 04 25 28 00 [ 42.688635] RSP: 002b:00007fff29eca1a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 42.696334] RAX: ffffffffffffffda RBX: 00007fff29eca250 RCX: 00007f1c7f31aaff [ 42.703591] RDX: 00007fff29eca250 RSI: 00000000c03864bc RDI: 0000000000000009 [ 42.710848] RBP: 00000000c03864bc R08: 000000000000000e R09: 000000000000000e [ 42.718104] R10: 0000000000000007 R11: 0000000000000246 R12: 00005643f0991d70 [ 42.725361] R13: 0000000000000009 R14: 00005643f22d0c50 R15: 00005643f0a74550 [ 42.732621] </TASK> Reviewed-by: Samson Tam <Samson.Tam@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.