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Daniel Vetter a703c55004 drm: safely free connectors from connector_iter 
In

commit 613051dac4
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Dec 14 00:08:06 2016 +0100

    drm: locking&new iterators for connector_list

we've went to extreme lengths to make sure connector iterations works
in any context, without introducing any additional locking context.
This worked, except for a small fumble in the implementation:

When we actually race with a concurrent connector unplug event, and
our temporary connector reference turns out to be the final one, then
everything breaks: We call the connector release function from
whatever context we happen to be in, which can be an irq/atomic
context. And connector freeing grabs all kinds of locks and stuff.

Fix this by creating a specially safe put function for connetor_iter,
which (in this rare case) punts the cleanup to a worker.

Reported-by: Ben Widawsky <ben@bwidawsk.net>
Cc: Ben Widawsky <ben@bwidawsk.net>
Fixes: 613051dac4 ("drm: locking&new iterators for connector_list")
Cc: Dave Airlie <airlied@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: <stable@vger.kernel.org> # v4.11+
Reviewed-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171204204818.24745-1-daniel.vetter@ffwll.ch
 		2017-12-06 10:22:55 +01:00
..
bridge drm/bridge/sii8620: add remote control support 2017-10-11 13:14:25 +02:00
i2c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tinydrm drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8() 2017-08-09 17:55:50 +02:00
ttm drm/ttm: fix populate_and_map() functions once more 2017-11-29 14:42:35 -05:00
amd_asic_type.h drm/amdgpu Moving amdgpu asic types to a separate file 2017-10-18 10:56:27 -04:00
ati_pcigart.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drmP.h drm: Add new LEASE debug level 2017-10-25 16:31:29 +10:00
drm_agpsupport.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drm_atomic.h drm/atomic: Make atomic iterators less surprising 2017-10-06 11:06:11 +02:00
drm_atomic_helper.h drm: Nuke drm_atomic_helper_connector_dpms 2017-08-08 14:48:48 +02:00
drm_auth.h drm: Add drm_object lease infrastructure [v5] 2017-10-25 16:31:29 +10:00
drm_blend.h drm: Add DRM_MODE_ROTATE_ and DRM_MODE_REFLECT_ to UAPI 2017-05-22 09:49:48 +02:00
drm_bridge.h drm/bridge: change return type of drm_bridge_add function 2017-08-21 08:51:53 +05:30
drm_cache.h
…
drm_color_mgmt.h drm: drm_color_mgmt.h needs struct drm_crtc declaration 2017-05-02 10:30:23 +02:00
drm_connector.h drm: safely free connectors from connector_iter 2017-12-06 10:22:55 +01:00
drm_crtc.h drm/mode_object: fix documentation for object lookups. 2017-11-10 13:50:47 +10:00
drm_crtc_helper.h drm/atomic: Acquire connection_mutex lock in drm_helper_probe_single_connector_modes, v4. 2017-04-06 21:29:23 +02:00
drm_debugfs.h drm/debugfs: Add kerneldoc 2017-03-24 09:36:06 +01:00
drm_debugfs_crc.h
…
drm_device.h drm: Extract drm_device.h 2017-08-11 10:47:17 +02:00
drm_displayid.h
…
drm_dp_dual_mode_helper.h
…
drm_dp_helper.h Merge remote-tracking branch 'pfdo/drm-next' into drm-next 2017-10-17 10:53:43 +10:00
drm_dp_mst_helper.h drm/dp/mst: Sideband message transaction to power up/down nodes 2017-09-11 16:03:57 +03:00
drm_drv.h drm: vblank: use ktime_t instead of timeval 2017-10-13 08:34:46 +10:00
drm_edid.h Merge tag 'drm-misc-fixes-2017-11-20' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2017-11-24 11:33:29 +10:00
drm_encoder.h drm/mode_object: fix documentation for object lookups. 2017-11-10 13:50:47 +10:00
drm_encoder_slave.h
…
drm_fb_cma_helper.h main drm pull request for v4.15 2017-11-15 20:42:10 -08:00
drm_fb_helper.h drm: remove unused and redundant callbacks 2017-08-07 11:20:36 +02:00
drm_file.h drm: introduce sync objects (v4) 2017-06-14 12:10:22 +10:00
drm_fixed.h
…
drm_flip_work.h
…
drm_fourcc.h drm: Add mode_config .get_format_info() hook 2017-03-22 19:45:00 +02:00
drm_framebuffer.h drm: Pass struct drm_file * to __drm_mode_object_find [v2] 2017-10-12 10:03:04 +10:00
drm_gem.h drm/gem: Add drm_gem_dumb_map_offset() 2017-07-29 13:49:55 +02:00
drm_gem_cma_helper.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drm_gem_framebuffer_helper.h drm/gem-fb-helper: Use debug message on gem lookup failure 2017-09-16 14:06:53 +02:00
drm_global.h drm: drop extern from function decls 2017-03-24 09:36:06 +01:00
drm_hashtab.h drm: drop extern from function decls 2017-03-24 09:36:06 +01:00
drm_ioctl.h new helper: drm_ioctl_kernel() 2017-05-27 15:39:28 -04:00
drm_irq.h drm: Extract drm_vblank.[hc] 2017-06-01 08:02:14 +02:00
drm_lease.h drm: Add four ioctls for managing drm mode object leases [v7] 2017-10-25 16:31:30 +10:00
drm_legacy.h
…
drm_mipi_dsi.h
…
drm_mm.h lib/interval_tree: fast overlap detection 2017-09-08 18:26:49 -07:00
drm_mode_config.h drm: add connector info/property for non-desktop displays [v2] 2017-11-23 12:45:25 +10:00
drm_mode_object.h drm: Add four ioctls for managing drm mode object leases [v7] 2017-10-25 16:31:30 +10:00
drm_modes.h drm: add helper functions for YCBCR420 handling 2017-07-14 21:23:54 +03:00
drm_modeset_helper.h
…
drm_modeset_helper_vtables.h drm/vtables: Fix typo 2017-09-01 19:50:24 +02:00
drm_modeset_lock.h drm/atomic: Prepare drm_modeset_lock infrastructure for interruptible waiting, v2. 2017-09-13 09:50:52 +02:00
drm_of.h main drm pull request for v4.15 2017-11-15 20:42:10 -08:00
drm_os_linux.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drm_panel.h drm: make drm_panel.h self-contained 2017-05-16 17:17:02 +02:00
drm_pci.h drm/pci: Deprecate drm_pci_init/exit completely 2017-06-20 10:41:03 +02:00
drm_pciids.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drm_plane.h drm/mode_object: fix documentation for object lookups. 2017-11-10 13:50:47 +10:00
drm_plane_helper.h drm: Add acquire ctx parameter to ->plane_disable 2017-03-29 09:14:58 +02:00
drm_prime.h drm: Extract drm_vblank.[hc] 2017-06-01 08:02:14 +02:00
drm_print.h drm: drm_printer: add __printf validation 2017-02-26 21:43:08 +01:00
drm_property.h drm/mode_object: fix documentation for object lookups. 2017-11-10 13:50:47 +10:00
drm_rect.h drm/doc: move printf helpers out of drmP.h 2017-05-31 09:59:41 +02:00
drm_scdc_helper.h drm: Fix warning when building docs for scdc_helper 2017-07-31 14:24:14 +02:00
drm_simple_kms_helper.h drm: Plumb modifiers through plane init 2017-08-01 17:50:06 +01:00
drm_syncobj.h drm/syncobj: add a new helper drm_syncobj_get_fd 2017-10-06 16:47:53 -04:00
drm_sysfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drm_vblank.h drm: Add CRTC_GET_SEQUENCE and CRTC_QUEUE_SEQUENCE ioctls [v3] 2017-10-23 11:15:03 +10:00
drm_vma_manager.h drm: Extract drm_prime.h 2017-03-09 16:18:02 +01:00
gma_drm.h
…
i915_component.h
…
i915_drm.h
…
i915_pciids.h drm/i915/kbl: Change a KBL pci id to GT2 from GT1.5 2017-09-21 06:22:29 -07:00
intel-gtt.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
intel_lpe_audio.h ALSA: x86: Register multiple PCM devices for the LPE audio card 2017-05-03 16:24:00 +03:00