On Fri, 18 May 2018, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > Delay registering ourselves with the acpi lid notification mechansim > until we are registering the connectors after initialisation is > complete. This prevents a possibilty of trying to handle the lid > notification before we are ready with the danger of chasing > uninitialised function pointers. > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 > IP: (null) > PGD 0 P4D 0 > Oops: 0010 [#1] PREEMPT SMP PTI > Modules linked in: arc4(+) iwldvm(+) i915(+) mac80211 i2c_algo_bit coretemp mei_wdt iwlwifi drm_kms_helper kvm_intel wmi_bmof iTCO_wdt iTCO_vendor_support kvm snd_hda_codec_conexant snd_hda_codec_generic drm psmouse cfg80211 irqbypass input_leds pcspkr i2c_i801 snd_hda_intel snd_hda_codec thinkpad_acpi snd_hda_core mei_me lpc_ich snd_hwdep e1000e wmi nvram snd_pcm mei snd_timer shpchp ptp pps_core rfkill syscopyarea snd intel_agp sysfillrect intel_gtt soundcore sysimgblt battery led_class fb_sys_fops ac rtc_cmos agpgart evdev mac_hid acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 fscrypto crypto_simd glue_helper cryptd aes_x86_64 xts algif_skcipher af_alg dm_crypt dm_mod sd_mod uas usb_storage serio_raw atkbd libps2 ahci libahci uhci_hcd libata scsi_mod ehci_pci > ehci_hcd usbcore usb_common i8042 serio > CPU: 1 PID: 378 Comm: systemd-logind Not tainted 4.16.8-1-ARCH #1 > Hardware name: LENOVO 7454CTO/7454CTO, BIOS 6DET72WW (3.22 ) 10/25/2012 > RIP: 0010: (null) > RSP: 0018:ffffaf4580c33a18 EFLAGS: 00010287 > RAX: 0000000000000000 RBX: ffff947533558000 RCX: 000000000000003e > RDX: ffffffffc0aa80c0 RSI: ffffaf4580c33a3c RDI: ffff947534e4c000 > RBP: ffff947533558338 R08: ffff947534598930 R09: ffffffffc0a928b1 > R10: ffffd8f181d5fd40 R11: 0000000000000000 R12: ffffffffc0a928b1 > R13: ffff947533558368 R14: ffffffffc0a928a9 R15: ffff947534e4c000 > FS: 00007f3dc4ddb940(0000) GS:ffff947539280000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 000000006e214000 CR4: 00000000000406e0 > Call Trace: > ? intel_modeset_setup_hw_state+0x385/0xf60 [i915] > ? __intel_display_resume+0x1e/0xc0 [i915] > ? intel_display_resume+0xcc/0x120 [i915] > ? intel_lid_notify+0xbc/0xc0 [i915] > ? notifier_call_chain+0x47/0x70 > ? blocking_notifier_call_chain+0x3e/0x60 > ? acpi_lid_notify_state+0x8f/0x1d0 > ? acpi_lid_update_state+0x49/0x70 > ? acpi_lid_input_open+0x60/0x90 > ? input_open_device+0x5d/0xa0 > ? evdev_open+0x1ba/0x1e0 [evdev] > ? chrdev_open+0xa3/0x1b0 > ? cdev_put.part.0+0x20/0x20 > ? do_dentry_open+0x14c/0x300 > ? path_openat+0x30c/0x1240 > ? current_time+0x16/0x60 > ? do_filp_open+0x93/0x100 > ? __check_object_size+0xfb/0x180 > ? do_sys_open+0x186/0x210 > ? do_syscall_64+0x74/0x190 > ? entry_SYSCALL_64_after_hwframe+0x3d/0xa2 > Code: Bad RIP value. > RIP: (null) RSP: ffffaf4580c33a18 > CR2: 0000000000000000 > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106559 > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx ? Fixes: ? Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_lvds.c | 43 +++++++++++++++++++++++-------- > 1 file changed, 32 insertions(+), 11 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c > index 8691c86f579c..a844d48e6731 100644 > --- a/drivers/gpu/drm/i915/intel_lvds.c > +++ b/drivers/gpu/drm/i915/intel_lvds.c > @@ -574,6 +574,36 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val, > return NOTIFY_OK; > } > > +static int > +intel_lvds_connector_register(struct drm_connector *connector) > +{ > + struct intel_lvds_connector *lvds = to_lvds_connector(connector); > + int ret; > + > + ret = intel_connector_register(connector); > + if (ret) > + return ret; > + > + lvds->lid_notifier.notifier_call = intel_lid_notify; > + if (acpi_lid_notifier_register(&lvds->lid_notifier)) { > + DRM_DEBUG_KMS("lid notifier registration failed\n"); > + lvds->lid_notifier.notifier_call = NULL; > + } > + > + return 0; > +} > + > +static void > +intel_lvds_connector_unregister(struct drm_connector *connector) > +{ > + struct intel_lvds_connector *lvds = to_lvds_connector(connector); > + > + if (lvds->lid_notifier.notifier_call) > + acpi_lid_notifier_unregister(&lvds->lid_notifier); > + > + intel_connector_unregister(connector); > +} > + > /** > * intel_lvds_destroy - unregister and free LVDS structures > * @connector: connector to free > @@ -586,9 +616,6 @@ static void intel_lvds_destroy(struct drm_connector *connector) > struct intel_lvds_connector *lvds_connector = > to_lvds_connector(connector); > > - if (lvds_connector->lid_notifier.notifier_call) > - acpi_lid_notifier_unregister(&lvds_connector->lid_notifier); > - > if (!IS_ERR_OR_NULL(lvds_connector->base.edid)) > kfree(lvds_connector->base.edid); > > @@ -609,8 +636,8 @@ static const struct drm_connector_funcs intel_lvds_connector_funcs = { > .fill_modes = drm_helper_probe_single_connector_modes, > .atomic_get_property = intel_digital_connector_atomic_get_property, > .atomic_set_property = intel_digital_connector_atomic_set_property, > - .late_register = intel_connector_register, > - .early_unregister = intel_connector_unregister, > + .late_register = intel_lvds_connector_register, > + .early_unregister = intel_lvds_connector_unregister, > .destroy = intel_lvds_destroy, > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > .atomic_duplicate_state = intel_digital_connector_duplicate_state, > @@ -1150,12 +1177,6 @@ void intel_lvds_init(struct drm_i915_private *dev_priv) > > lvds_encoder->a3_power = lvds & LVDS_A3_POWER_MASK; > > - lvds_connector->lid_notifier.notifier_call = intel_lid_notify; > - if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) { > - DRM_DEBUG_KMS("lid notifier registration failed\n"); > - lvds_connector->lid_notifier.notifier_call = NULL; > - } > - > return; > > failed: -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
