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[ Upstream commit 19cc1f3829567e7dca21c1389ea6407b8f5efab4 ] [why] During dsc enable, a divide by zero condition triggered the kernel crash. [how] An IGT test, which enable the DSC, was crashing at the time of restore the default dsc status, becaue of h_totals value becoming 0. So add a check before divide condition. If h_total is zero, gracefully ignore and set the default value. kernel panic log: [ 128.758827] divide error: 0000 [#1] PREEMPT SMP NOPTI [ 128.762714] CPU: 5 PID: 4562 Comm: amd_dp_dsc Tainted: G W 5.4.19-android-x86_64 #1 [ 128.769728] Hardware name: ADVANCED MICRO DEVICES, INC. Mauna/Mauna, BIOS WMN0B13N Nov 11 2020 [ 128.777695] RIP: 0010:hubp2_vready_at_or_After_vsync+0x37/0x7a [amdgpu] [ 128.785707] Code: 80 02 00 00 48 89 f3 48 8b 7f 08 b ...... [ 128.805696] RSP: 0018:ffffad8f82d43628 EFLAGS: 00010246 ...... [ 128.857707] CR2: 00007106d8465000 CR3: 0000000426530000 CR4: 0000000000140ee0 [ 128.865695] Call Trace: [ 128.869712] hubp3_setup+0x1f/0x7f [amdgpu] [ 128.873705] dcn20_update_dchubp_dpp+0xc8/0x54a [amdgpu] [ 128.877706] dcn20_program_front_end_for_ctx+0x31d/0x463 [amdgpu] [ 128.885706] dc_commit_state+0x3d2/0x658 [amdgpu] [ 128.889707] amdgpu_dm_atomic_commit_tail+0x4b3/0x1e7c [amdgpu] [ 128.897699] ? dm_read_reg_func+0x41/0xb5 [amdgpu] [ 128.901707] ? dm_read_reg_func+0x41/0xb5 [amdgpu] [ 128.905706] ? __is_insn_slot_addr+0x43/0x48 [ 128.909706] ? fill_plane_buffer_attributes+0x29e/0x3dc [amdgpu] [ 128.917705] ? dm_plane_helper_prepare_fb+0x255/0x284 [amdgpu] [ 128.921700] ? usleep_range+0x7c/0x7c [ 128.925705] ? preempt_count_sub+0xf/0x18 [ 128.929706] ? _raw_spin_unlock_irq+0x13/0x24 [ 128.933732] ? __wait_for_common+0x11e/0x18f [ 128.937705] ? _raw_spin_unlock_irq+0x13/0x24 [ 128.941706] ? __wait_for_common+0x11e/0x18f [ 128.945705] commit_tail+0x8b/0xd2 [drm_kms_helper] [ 128.949707] drm_atomic_helper_commit+0xd8/0xf5 [drm_kms_helper] [ 128.957706] amdgpu_dm_atomic_commit+0x337/0x360 [amdgpu] [ 128.961705] ? drm_atomic_check_only+0x543/0x68d [drm] [ 128.969705] ? drm_atomic_set_property+0x760/0x7af [drm] [ 128.973704] ? drm_mode_atomic_ioctl+0x6f3/0x85a [drm] [ 128.977705] drm_mode_atomic_ioctl+0x6f3/0x85a [drm] [ 128.985705] ? drm_atomic_set_property+0x7af/0x7af [drm] [ 128.989706] drm_ioctl_kernel+0x82/0xda [drm] [ 128.993706] drm_ioctl+0x225/0x319 [drm] [ 128.997707] ? drm_atomic_set_property+0x7af/0x7af [drm] [ 129.001706] ? preempt_count_sub+0xf/0x18 [ 129.005713] amdgpu_drm_ioctl+0x4b/0x76 [amdgpu] [ 129.009705] vfs_ioctl+0x1d/0x2a [ 129.013705] do_vfs_ioctl+0x419/0x43d [ 129.017707] ksys_ioctl+0x52/0x71 [ 129.021707] __x64_sys_ioctl+0x16/0x19 [ 129.025706] do_syscall_64+0x78/0x85 [ 129.029705] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Signed-off-by: Robin Singh <robin.singh@amd.com> Reviewed-by: Harry Wentland <Harry.Wentland@amd.com> Reviewed-by: Robin Singh <Robin.Singh@amd.com> Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.