| Message ID | Ze-Pf1_E-p4G8o0l@debian.local (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] Fix divide-by-zero regression on DP MST unplug with nouveau | expand |
On Mon, Mar 11, 2024 at 11:10:55PM +0000, Chris Bainbridge wrote: > Fix a regression when using nouveau and unplugging a StarTech MSTDP122DP > DisplaypPort 1.2 MST hub (the same regression does not appear when using > a Cable Matters DisplayPort 1.4 MST hub). Trace: > > divide error: 0000 [#1] PREEMPT SMP PTI > CPU: 7 PID: 2962 Comm: Xorg Not tainted 6.8.0-rc3+ #744 > Hardware name: Razer Blade/DANA_MB, BIOS 01.01 08/31/2018 > RIP: 0010:drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] > Code: c6 b8 01 00 00 00 75 61 01 c6 41 0f af f3 41 0f af f1 c1 e1 04 48 63 c7 31 d2 89 ff 48 8b 5d f8 c9 48 0f af f1 48 8d 44 06 ff <48> f7 f7 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 45 31 > RSP: 0018:ffffb2c5c211fa30 EFLAGS: 00010206 > RAX: ffffffffffffffff RBX: 0000000000000000 RCX: 0000000000f59b00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffffb2c5c211fa48 R08: 0000000000000001 R09: 0000000000000020 > R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000023b4a > R13: ffff91d37d165800 R14: ffff91d36fac6d80 R15: ffff91d34a764010 > FS: 00007f4a1ca3fa80(0000) GS:ffff91d6edbc0000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000559491d49000 CR3: 000000011d180002 CR4: 00000000003706f0 > Call Trace: > <TASK> > ? show_regs+0x6d/0x80 > ? die+0x37/0xa0 > ? do_trap+0xd4/0xf0 > ? do_error_trap+0x71/0xb0 > ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] > ? exc_divide_error+0x3a/0x70 > ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] > ? asm_exc_divide_error+0x1b/0x20 > ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] > ? drm_dp_calc_pbn_mode+0x2e/0x70 [drm_display_helper] > nv50_msto_atomic_check+0xda/0x120 [nouveau] > drm_atomic_helper_check_modeset+0xa87/0xdf0 [drm_kms_helper] > drm_atomic_helper_check+0x19/0xa0 [drm_kms_helper] > nv50_disp_atomic_check+0x13f/0x2f0 [nouveau] > drm_atomic_check_only+0x668/0xb20 [drm] > ? drm_connector_list_iter_next+0x86/0xc0 [drm] > drm_atomic_commit+0x58/0xd0 [drm] > ? __pfx___drm_printfn_info+0x10/0x10 [drm] > drm_atomic_connector_commit_dpms+0xd7/0x100 [drm] > drm_mode_obj_set_property_ioctl+0x1c5/0x450 [drm] > ? __pfx_drm_connector_property_set_ioctl+0x10/0x10 [drm] > drm_connector_property_set_ioctl+0x3b/0x60 [drm] > drm_ioctl_kernel+0xb9/0x120 [drm] > drm_ioctl+0x2d0/0x550 [drm] > ? __pfx_drm_connector_property_set_ioctl+0x10/0x10 [drm] > nouveau_drm_ioctl+0x61/0xc0 [nouveau] > __x64_sys_ioctl+0xa0/0xf0 > do_syscall_64+0x76/0x140 > ? do_syscall_64+0x85/0x140 > ? do_syscall_64+0x85/0x140 > entry_SYSCALL_64_after_hwframe+0x6e/0x76 > RIP: 0033:0x7f4a1cd1a94f > 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 > RSP: 002b:00007ffd2f1df520 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007ffd2f1df5b0 RCX: 00007f4a1cd1a94f > RDX: 00007ffd2f1df5b0 RSI: 00000000c01064ab RDI: 000000000000000f > RBP: 00000000c01064ab R08: 000056347932deb8 R09: 000056347a7d99c0 > R10: 0000000000000000 R11: 0000000000000246 R12: 000056347938a220 > R13: 000000000000000f R14: 0000563479d9f3f0 R15: 0000000000000000 > </TASK> > Modules linked in: rfcomm xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge stp llc ccm cmac algif_hash overlay algif_skcipher af_alg bnep binfmt_misc snd_sof_pci_intel_cnl snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof_intel_hda snd_sof snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_compress snd_sof_intel_hda_mlink snd_hda_ext_core iwlmvm intel_rapl_msr intel_rapl_common intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp mac80211 coretemp kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_realtek snd_hda_codec_generic uvcvideo libarc4 snd_hda_intel snd_intel_dspcfg snd_hda_codec iwlwifi videobuf2_vmalloc videobuf2_memops uvc irqbypass btusb videobuf2_v4l2 snd_seq_midi crct10dif_pclmul hid_multitouch crc32_pclmul snd_seq_midi_event btrtl snd_hwdep videodev polyval_clmulni polyval_generic snd_rawmidi > ghash_clmulni_intel aesni_intel btintel crypto_simd snd_hda_core cryptd snd_seq btbcm ee1004 8250_dw videobuf2_common btmtk rapl nls_iso8859_1 mei_hdcp thunderbolt bluetooth intel_cstate wmi_bmof intel_wmi_thunderbolt cfg80211 snd_pcm mc snd_seq_device i2c_i801 r8169 ecdh_generic snd_timer i2c_smbus ecc snd mei_me intel_lpss_pci mei ahci intel_lpss soundcore realtek libahci idma64 intel_pch_thermal i2c_hid_acpi i2c_hid acpi_pad sch_fq_codel msr parport_pc ppdev lp parport efi_pstore ip_tables x_tables autofs4 dm_crypt raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq raid1 raid0 joydev input_leds hid_generic usbhid hid nouveau i915 drm_ttm_helper gpu_sched drm_gpuvm drm_exec i2c_algo_bit drm_buddy ttm drm_display_helper drm_kms_helper cec rc_core drm nvme nvme_core mxm_wmi xhci_pci xhci_pci_renesas video wmi pinctrl_cannonlake mac_hid > ---[ end trace 0000000000000000 ]--- > > Fix this by avoiding the divide if bpp is 0. > > Fixes: c1d6a22b7219 ("drm/dp: Add helpers to calculate the link BW overhead") > Signed-off-by: Chris Bainbridge <chris.bainbridge@gmail.com> > Acked-by: Imre Deak <imre.deak@intel.com> > --- > drivers/gpu/drm/display/drm_dp_helper.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c > index b1ca3a1100da..9f0e7142f174 100644 > --- a/drivers/gpu/drm/display/drm_dp_helper.c > +++ b/drivers/gpu/drm/display/drm_dp_helper.c > @@ -3982,6 +3982,13 @@ int drm_dp_bw_overhead(int lane_count, int hactive, > u32 overhead = 1000000; > int symbol_cycles; > > + if (bpp_x16 == 0) { > + DRM_DEBUG("drm_dp_bw_overhead called with bpp 0\n"); > + } > + if (lane_count == 0 || hactive == 0 || bpp_x16 == 0) { Could you add lane_count and hactive to the debug print as well? Something like "Invalid BW overhead params: lane_count %d, hactive %d, bpp_x16 %d.04d". > + return 0; > + } > + > /* > * DP Standard v2.1 2.6.4.1 > * SSC downspread and ref clock variation margin: > -- > 2.39.2 >
On Tue, 12 Mar 2024, Imre Deak <imre.deak@intel.com> wrote: > On Mon, Mar 11, 2024 at 11:10:55PM +0000, Chris Bainbridge wrote: >> Fix a regression when using nouveau and unplugging a StarTech MSTDP122DP >> DisplaypPort 1.2 MST hub (the same regression does not appear when using >> a Cable Matters DisplayPort 1.4 MST hub). Trace: >> >> divide error: 0000 [#1] PREEMPT SMP PTI >> CPU: 7 PID: 2962 Comm: Xorg Not tainted 6.8.0-rc3+ #744 >> Hardware name: Razer Blade/DANA_MB, BIOS 01.01 08/31/2018 >> RIP: 0010:drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] >> Code: c6 b8 01 00 00 00 75 61 01 c6 41 0f af f3 41 0f af f1 c1 e1 04 48 63 c7 31 d2 89 ff 48 8b 5d f8 c9 48 0f af f1 48 8d 44 06 ff <48> f7 f7 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 45 31 >> RSP: 0018:ffffb2c5c211fa30 EFLAGS: 00010206 >> RAX: ffffffffffffffff RBX: 0000000000000000 RCX: 0000000000f59b00 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 >> RBP: ffffb2c5c211fa48 R08: 0000000000000001 R09: 0000000000000020 >> R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000023b4a >> R13: ffff91d37d165800 R14: ffff91d36fac6d80 R15: ffff91d34a764010 >> FS: 00007f4a1ca3fa80(0000) GS:ffff91d6edbc0000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000559491d49000 CR3: 000000011d180002 CR4: 00000000003706f0 >> Call Trace: >> <TASK> >> ? show_regs+0x6d/0x80 >> ? die+0x37/0xa0 >> ? do_trap+0xd4/0xf0 >> ? do_error_trap+0x71/0xb0 >> ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] >> ? exc_divide_error+0x3a/0x70 >> ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] >> ? asm_exc_divide_error+0x1b/0x20 >> ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] >> ? drm_dp_calc_pbn_mode+0x2e/0x70 [drm_display_helper] >> nv50_msto_atomic_check+0xda/0x120 [nouveau] >> drm_atomic_helper_check_modeset+0xa87/0xdf0 [drm_kms_helper] >> drm_atomic_helper_check+0x19/0xa0 [drm_kms_helper] >> nv50_disp_atomic_check+0x13f/0x2f0 [nouveau] >> drm_atomic_check_only+0x668/0xb20 [drm] >> ? drm_connector_list_iter_next+0x86/0xc0 [drm] >> drm_atomic_commit+0x58/0xd0 [drm] >> ? __pfx___drm_printfn_info+0x10/0x10 [drm] >> drm_atomic_connector_commit_dpms+0xd7/0x100 [drm] >> drm_mode_obj_set_property_ioctl+0x1c5/0x450 [drm] >> ? __pfx_drm_connector_property_set_ioctl+0x10/0x10 [drm] >> drm_connector_property_set_ioctl+0x3b/0x60 [drm] >> drm_ioctl_kernel+0xb9/0x120 [drm] >> drm_ioctl+0x2d0/0x550 [drm] >> ? __pfx_drm_connector_property_set_ioctl+0x10/0x10 [drm] >> nouveau_drm_ioctl+0x61/0xc0 [nouveau] >> __x64_sys_ioctl+0xa0/0xf0 >> do_syscall_64+0x76/0x140 >> ? do_syscall_64+0x85/0x140 >> ? do_syscall_64+0x85/0x140 >> entry_SYSCALL_64_after_hwframe+0x6e/0x76 >> RIP: 0033:0x7f4a1cd1a94f >> 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 >> RSP: 002b:00007ffd2f1df520 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 >> RAX: ffffffffffffffda RBX: 00007ffd2f1df5b0 RCX: 00007f4a1cd1a94f >> RDX: 00007ffd2f1df5b0 RSI: 00000000c01064ab RDI: 000000000000000f >> RBP: 00000000c01064ab R08: 000056347932deb8 R09: 000056347a7d99c0 >> R10: 0000000000000000 R11: 0000000000000246 R12: 000056347938a220 >> R13: 000000000000000f R14: 0000563479d9f3f0 R15: 0000000000000000 >> </TASK> >> Modules linked in: rfcomm xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge stp llc ccm cmac algif_hash overlay algif_skcipher af_alg bnep binfmt_misc snd_sof_pci_intel_cnl snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof_intel_hda snd_sof snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_compress snd_sof_intel_hda_mlink snd_hda_ext_core iwlmvm intel_rapl_msr intel_rapl_common intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp mac80211 coretemp kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_realtek snd_hda_codec_generic uvcvideo libarc4 snd_hda_intel snd_intel_dspcfg snd_hda_codec iwlwifi videobuf2_vmalloc videobuf2_memops uvc irqbypass btusb videobuf2_v4l2 snd_seq_midi crct10dif_pclmul hid_multitouch crc32_pclmul snd_seq_midi_event btrtl snd_hwdep videodev polyval_clmulni polyval_generic snd_rawmidi >> ghash_clmulni_intel aesni_intel btintel crypto_simd snd_hda_core cryptd snd_seq btbcm ee1004 8250_dw videobuf2_common btmtk rapl nls_iso8859_1 mei_hdcp thunderbolt bluetooth intel_cstate wmi_bmof intel_wmi_thunderbolt cfg80211 snd_pcm mc snd_seq_device i2c_i801 r8169 ecdh_generic snd_timer i2c_smbus ecc snd mei_me intel_lpss_pci mei ahci intel_lpss soundcore realtek libahci idma64 intel_pch_thermal i2c_hid_acpi i2c_hid acpi_pad sch_fq_codel msr parport_pc ppdev lp parport efi_pstore ip_tables x_tables autofs4 dm_crypt raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq raid1 raid0 joydev input_leds hid_generic usbhid hid nouveau i915 drm_ttm_helper gpu_sched drm_gpuvm drm_exec i2c_algo_bit drm_buddy ttm drm_display_helper drm_kms_helper cec rc_core drm nvme nvme_core mxm_wmi xhci_pci xhci_pci_renesas video wmi pinctrl_cannonlake mac_hid >> ---[ end trace 0000000000000000 ]--- >> >> Fix this by avoiding the divide if bpp is 0. >> >> Fixes: c1d6a22b7219 ("drm/dp: Add helpers to calculate the link BW overhead") >> Signed-off-by: Chris Bainbridge <chris.bainbridge@gmail.com> >> Acked-by: Imre Deak <imre.deak@intel.com> >> --- >> drivers/gpu/drm/display/drm_dp_helper.c | 7 +++++++ >> 1 file changed, 7 insertions(+) >> >> diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c >> index b1ca3a1100da..9f0e7142f174 100644 >> --- a/drivers/gpu/drm/display/drm_dp_helper.c >> +++ b/drivers/gpu/drm/display/drm_dp_helper.c >> @@ -3982,6 +3982,13 @@ int drm_dp_bw_overhead(int lane_count, int hactive, >> u32 overhead = 1000000; >> int symbol_cycles; >> >> + if (bpp_x16 == 0) { >> + DRM_DEBUG("drm_dp_bw_overhead called with bpp 0\n"); >> + } >> + if (lane_count == 0 || hactive == 0 || bpp_x16 == 0) { > > Could you add lane_count and hactive to the debug print as well? > Something like "Invalid BW overhead params: lane_count %d, hactive %d, bpp_x16 %d.04d". And within one if instead of two, and use DRM_DEBUG_KMS, and it debug logs the function, no need to duplicate it. BR, Jani. > >> + return 0; >> + } >> + >> /* >> * DP Standard v2.1 2.6.4.1 >> * SSC downspread and ref clock variation margin: >> -- >> 2.39.2 >>
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index b1ca3a1100da..9f0e7142f174 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -3982,6 +3982,13 @@ int drm_dp_bw_overhead(int lane_count, int hactive, u32 overhead = 1000000; int symbol_cycles; + if (bpp_x16 == 0) { + DRM_DEBUG("drm_dp_bw_overhead called with bpp 0\n"); + } + if (lane_count == 0 || hactive == 0 || bpp_x16 == 0) { + return 0; + } + /* * DP Standard v2.1 2.6.4.1 * SSC downspread and ref clock variation margin:
Fix a regression when using nouveau and unplugging a StarTech MSTDP122DP DisplaypPort 1.2 MST hub (the same regression does not appear when using a Cable Matters DisplayPort 1.4 MST hub). Trace: divide error: 0000 [#1] PREEMPT SMP PTI CPU: 7 PID: 2962 Comm: Xorg Not tainted 6.8.0-rc3+ #744 Hardware name: Razer Blade/DANA_MB, BIOS 01.01 08/31/2018 RIP: 0010:drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] Code: c6 b8 01 00 00 00 75 61 01 c6 41 0f af f3 41 0f af f1 c1 e1 04 48 63 c7 31 d2 89 ff 48 8b 5d f8 c9 48 0f af f1 48 8d 44 06 ff <48> f7 f7 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 45 31 RSP: 0018:ffffb2c5c211fa30 EFLAGS: 00010206 RAX: ffffffffffffffff RBX: 0000000000000000 RCX: 0000000000f59b00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffb2c5c211fa48 R08: 0000000000000001 R09: 0000000000000020 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000023b4a R13: ffff91d37d165800 R14: ffff91d36fac6d80 R15: ffff91d34a764010 FS: 00007f4a1ca3fa80(0000) GS:ffff91d6edbc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559491d49000 CR3: 000000011d180002 CR4: 00000000003706f0 Call Trace: <TASK> ? show_regs+0x6d/0x80 ? die+0x37/0xa0 ? do_trap+0xd4/0xf0 ? do_error_trap+0x71/0xb0 ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] ? exc_divide_error+0x3a/0x70 ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] ? asm_exc_divide_error+0x1b/0x20 ? drm_dp_bw_overhead+0xb4/0x110 [drm_display_helper] ? drm_dp_calc_pbn_mode+0x2e/0x70 [drm_display_helper] nv50_msto_atomic_check+0xda/0x120 [nouveau] drm_atomic_helper_check_modeset+0xa87/0xdf0 [drm_kms_helper] drm_atomic_helper_check+0x19/0xa0 [drm_kms_helper] nv50_disp_atomic_check+0x13f/0x2f0 [nouveau] drm_atomic_check_only+0x668/0xb20 [drm] ? drm_connector_list_iter_next+0x86/0xc0 [drm] drm_atomic_commit+0x58/0xd0 [drm] ? __pfx___drm_printfn_info+0x10/0x10 [drm] drm_atomic_connector_commit_dpms+0xd7/0x100 [drm] drm_mode_obj_set_property_ioctl+0x1c5/0x450 [drm] ? __pfx_drm_connector_property_set_ioctl+0x10/0x10 [drm] drm_connector_property_set_ioctl+0x3b/0x60 [drm] drm_ioctl_kernel+0xb9/0x120 [drm] drm_ioctl+0x2d0/0x550 [drm] ? __pfx_drm_connector_property_set_ioctl+0x10/0x10 [drm] nouveau_drm_ioctl+0x61/0xc0 [nouveau] __x64_sys_ioctl+0xa0/0xf0 do_syscall_64+0x76/0x140 ? do_syscall_64+0x85/0x140 ? do_syscall_64+0x85/0x140 entry_SYSCALL_64_after_hwframe+0x6e/0x76 RIP: 0033:0x7f4a1cd1a94f 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 RSP: 002b:00007ffd2f1df520 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffd2f1df5b0 RCX: 00007f4a1cd1a94f RDX: 00007ffd2f1df5b0 RSI: 00000000c01064ab RDI: 000000000000000f RBP: 00000000c01064ab R08: 000056347932deb8 R09: 000056347a7d99c0 R10: 0000000000000000 R11: 0000000000000246 R12: 000056347938a220 R13: 000000000000000f R14: 0000563479d9f3f0 R15: 0000000000000000 </TASK> Modules linked in: rfcomm xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge stp llc ccm cmac algif_hash overlay algif_skcipher af_alg bnep binfmt_misc snd_sof_pci_intel_cnl snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof_intel_hda snd_sof snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_compress snd_sof_intel_hda_mlink snd_hda_ext_core iwlmvm intel_rapl_msr intel_rapl_common intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp mac80211 coretemp kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_realtek snd_hda_codec_generic uvcvideo libarc4 snd_hda_intel snd_intel_dspcfg snd_hda_codec iwlwifi videobuf2_vmalloc videobuf2_memops uvc irqbypass btusb videobuf2_v4l2 snd_seq_midi crct10dif_pclmul hid_multitouch crc32_pclmul snd_seq_midi_event btrtl snd_hwdep videodev polyval_clmulni polyval_generic snd_rawmidi ghash_clmulni_intel aesni_intel btintel crypto_simd snd_hda_core cryptd snd_seq btbcm ee1004 8250_dw videobuf2_common btmtk rapl nls_iso8859_1 mei_hdcp thunderbolt bluetooth intel_cstate wmi_bmof intel_wmi_thunderbolt cfg80211 snd_pcm mc snd_seq_device i2c_i801 r8169 ecdh_generic snd_timer i2c_smbus ecc snd mei_me intel_lpss_pci mei ahci intel_lpss soundcore realtek libahci idma64 intel_pch_thermal i2c_hid_acpi i2c_hid acpi_pad sch_fq_codel msr parport_pc ppdev lp parport efi_pstore ip_tables x_tables autofs4 dm_crypt raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq raid1 raid0 joydev input_leds hid_generic usbhid hid nouveau i915 drm_ttm_helper gpu_sched drm_gpuvm drm_exec i2c_algo_bit drm_buddy ttm drm_display_helper drm_kms_helper cec rc_core drm nvme nvme_core mxm_wmi xhci_pci xhci_pci_renesas video wmi pinctrl_cannonlake mac_hid ---[ end trace 0000000000000000 ]--- Fix this by avoiding the divide if bpp is 0. Fixes: c1d6a22b7219 ("drm/dp: Add helpers to calculate the link BW overhead") Signed-off-by: Chris Bainbridge <chris.bainbridge@gmail.com> Acked-by: Imre Deak <imre.deak@intel.com> --- drivers/gpu/drm/display/drm_dp_helper.c | 7 +++++++ 1 file changed, 7 insertions(+)