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7fb71c8f4f
In the error path, we have to be ready to handle an error before either
the state or restore_state have been allocated.
[ 397.001342] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 397.001419] IP: [<ffffffffa04347b4>] intel_get_load_detect_pipe+0xe4/0x610 [i915]
[ 397.001502] PGD 136a2a067
[ 397.001523] PUD 134b5f067
[ 397.001546] PMD 0
[ 397.001569] Oops: 0002 [#1] PREEMPT SMP
[ 397.001599] Modules linked in: snd_hda_intel i915 cdc_ncm usbnet mii x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec snd_hwdep snd_hda_core snd_pcm lpc_ich mei_me mei sdhci_pci sdhci mmc_core e1000e ptp pps_core [last unloaded: i915]
[ 397.001902] CPU: 1 PID: 9287 Comm: kms_force_conne Tainted: G U 4.9.0-rc1-CI-CI_DRM_1730+ #1
[ 397.001965] Hardware name: LENOVO 2356GCG/2356GCG, BIOS G7ET31WW (1.13 ) 07/02/2012
[ 397.002017] task: ffff880138c38040 task.stack: ffffc900083e4000
[ 397.002057] RIP: 0010:[<ffffffffa04347b4>] [<ffffffffa04347b4>] intel_get_load_detect_pipe+0xe4/0x610 [i915]
[ 397.002153] RSP: 0018:ffffc900083e7ae8 EFLAGS: 00010286
[ 397.002191] RAX: 00000000ffffffdd RBX: ffffc900083e7bc8 RCX: 0000000000000006
[ 397.002239] RDX: 0000000000000006 RSI: ffff880138c388b8 RDI: ffffc900083e79e0
[ 397.002287] RBP: ffffc900083e7b78 R08: 0000000000000000 R09: 0000000000000000
[ 397.002335] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 397.002386] R13: ffff8801305e1158 R14: 00000000ffffffdd R15: 0000000000000000
[ 397.002434] FS: 00007fea1b03c740(0000) GS:ffff88013e240000(0000) knlGS:0000000000000000
[ 397.002488] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 397.002528] CR2: 0000000000000000 CR3: 00000001361da000 CR4: 00000000001406e0
[ 397.002576] Stack:
[ 397.002592] ffff88013046f180 0000000000000000 ffffc900083e7bc0 0000000000000000
[ 397.002655] 0000000000000000 ffff8801306bd038 ffff88012e980000 ffffc90000000001
[ 397.002718] ffffc90000000000 ffff880136b8ca88 ffff88012e980890 ffff88012e980540
[ 397.002780] Call Trace:
[ 397.002828] [<ffffffffa044e8c4>] intel_crt_detect+0x3c4/0x8f0 [i915]
[ 397.002876] [<ffffffff810e37fa>] ? vprintk_default+0x1a/0x20
[ 397.002918] [<ffffffff8116eb68>] ? printk+0x43/0x4b
[ 397.002956] [<ffffffff81546b06>] drm_helper_probe_single_connector_modes+0x406/0x4f0
[ 397.003014] [<ffffffff81819c09>] ? mutex_unlock+0x9/0x10
[ 397.003054] [<ffffffff815723dc>] drm_mode_getconnector+0x33c/0x3c0
[ 397.003099] [<ffffffff810ed59d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 397.003147] [<ffffffff811a6bae>] ? __might_fault+0x3e/0x90
[ 397.003191] [<ffffffff8155aaf6>] drm_ioctl+0x1f6/0x480
[ 397.003231] [<ffffffff815720a0>] ? drm_mode_connector_property_set_ioctl+0x30/0x30
[ 397.003285] [<ffffffff8120308e>] do_vfs_ioctl+0x8e/0x690
[ 397.003324] [<ffffffff810a102c>] ? task_work_run+0x8c/0xb0
[ 397.003366] [<ffffffff810d6d92>] ? trace_hardirqs_on_caller+0x122/0x1b0
[ 397.003412] [<ffffffff812036cc>] SyS_ioctl+0x3c/0x70
[ 397.003451] [<ffffffff8181df2e>] entry_SYSCALL_64_fastpath+0x1c/0xb1
[ 397.003496] Code: 85 c0 41 89 c6 75 57 49 8b 85 f0 00 00 00 48 89 de 45 31 ff 48 8d 78 20 e8 1a 89 13 e1 45 31 c9 85 c0 41 89 c6 0f 84 2f 01 00 00 <f0> 41 83 29 01 74 53 f0 41 83 2f 01 74 2d 41 83 fe dd 75 35 48
[ 397.003837] RIP [<ffffffffa04347b4>] intel_get_load_detect_pipe+0xe4/0x610 [i915]
[ 397.003921] RSP <ffffc900083e7ae8>
[ 397.003947] CR2: 0000000000000000
Testcase: igt/kms_force_connector_basic/force-load-detect # ivb-3720m
Fixes:
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|---|---|---|
| .. | ||
| amd | ||
| arc | ||
| arm | ||
| armada | ||
| ast | ||
| atmel-hlcdc | ||
| bochs | ||
| bridge | ||
| cirrus | ||
| etnaviv | ||
| exynos | ||
| fsl-dcu | ||
| gma500 | ||
| hisilicon | ||
| i2c | ||
| i810 | ||
| i915 | ||
| imx | ||
| mediatek | ||
| mga | ||
| mgag200 | ||
| msm | ||
| nouveau | ||
| omapdrm | ||
| panel | ||
| qxl | ||
| r128 | ||
| radeon | ||
| rcar-du | ||
| rockchip | ||
| savage | ||
| shmobile | ||
| sis | ||
| sti | ||
| sun4i | ||
| tdfx | ||
| tegra | ||
| tilcdc | ||
| ttm | ||
| udl | ||
| vc4 | ||
| vgem | ||
| via | ||
| virtio | ||
| vmwgfx | ||
| ati_pcigart.c | ||
| drm_agpsupport.c | ||
| drm_atomic_helper.c | ||
| drm_atomic.c | ||
| drm_auth.c | ||
| drm_blend.c | ||
| drm_bridge.c | ||
| drm_bufs.c | ||
| drm_cache.c | ||
| drm_color_mgmt.c | ||
| drm_connector.c | ||
| drm_context.c | ||
| drm_crtc_helper_internal.h | ||
| drm_crtc_helper.c | ||
| drm_crtc_internal.h | ||
| drm_crtc.c | ||
| drm_debugfs_crc.c | ||
| drm_debugfs.c | ||
| drm_dma.c | ||
| drm_dp_aux_dev.c | ||
| drm_dp_dual_mode_helper.c | ||
| drm_dp_helper.c | ||
| drm_dp_mst_topology.c | ||
| drm_drv.c | ||
| drm_edid_load.c | ||
| drm_edid.c | ||
| drm_encoder_slave.c | ||
| drm_encoder.c | ||
| drm_fb_cma_helper.c | ||
| drm_fb_helper.c | ||
| drm_flip_work.c | ||
| drm_fops.c | ||
| drm_fourcc.c | ||
| drm_framebuffer.c | ||
| drm_gem_cma_helper.c | ||
| drm_gem.c | ||
| drm_global.c | ||
| drm_hashtab.c | ||
| drm_info.c | ||
| drm_internal.h | ||
| drm_ioc32.c | ||
| drm_ioctl.c | ||
| drm_irq.c | ||
| drm_kms_helper_common.c | ||
| drm_legacy.h | ||
| drm_lock.c | ||
| drm_memory.c | ||
| drm_mipi_dsi.c | ||
| drm_mm.c | ||
| drm_mode_object.c | ||
| drm_modes.c | ||
| drm_modeset_helper.c | ||
| drm_modeset_lock.c | ||
| drm_of.c | ||
| drm_panel.c | ||
| drm_pci.c | ||
| drm_plane_helper.c | ||
| drm_plane.c | ||
| drm_platform.c | ||
| drm_prime.c | ||
| drm_probe_helper.c | ||
| drm_property.c | ||
| drm_rect.c | ||
| drm_scatter.c | ||
| drm_simple_kms_helper.c | ||
| drm_sysfs.c | ||
| drm_trace_points.c | ||
| drm_trace.h | ||
| drm_vm.c | ||
| drm_vma_manager.c | ||
| Kconfig | ||
| Makefile | ||