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linux/drivers/gpu/drm
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Maxime Ripard 8b11aaface drm/sun4i: Implement endpoint parsing using kfifo 
The commit da82b8785e ("drm/sun4i: add components in breadth first
traversal order") implemented a breadth first traversal of our device tree
nodes graph. However, it was relying on the kernel linked lists, and those
are not really safe for addition.

Indeed, in a single pipeline stage, your first stage (ie, the mixer or
fronted) will be queued, and it will be the final iteration of that list as
far as list_for_each_entry_safe is concerned. Then, during that final
iteration, we'll queue another element (the TCON or the backend) that
list_for_each_entry_safe will not account for, and we will leave the loop
without having iterated over all the elements. And since we won't have
built our components list properly, the DRM driver will be left
non-functional.

We can instead use a kfifo to queue and enqueue components in-order, as was
the original intention. This also has the benefit of removing any dynamic
allocation, making the error handling path simpler too. The only thing
we're losing is the ability to tell whether an element has already been
queued, but that was only needed to remove spurious logs, and therefore
purely cosmetic.

This means that this commit effectively reverses e8afb7b67f ("drm/sun4i:
don't add components that are already in the queue").

Fixes: da82b8785e ("drm/sun4i: add components in breadth first traversal order")
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4ecb323e787918208f6a5d9f0ebba12c62583c98.1508231063.git-series.maxime.ripard@free-electrons.com
2017-10-17 16:31:31 +02:00
..
amd Linux 4.14-rc3 2017-10-03 09:35:04 +10:00
arc drm/arc: Use drm_gem_fb_create() 2017-09-02 14:23:06 +02:00
arm drm/arm/mali: Use drm_gem_fb_create() 2017-08-27 19:29:46 +02:00
armada drm/armada: Replace drm_framebuffer_reference/unreference() with _get/put() 2017-10-16 15:02:44 -04:00
ast Merge tag 'drm-misc-next-2017-08-16' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-08-17 07:33:41 +10:00
atmel-hlcdc drm/atmel-hlcdc: Use drm_gem_fb_create() 2017-08-27 19:30:15 +02:00
bochs drm/bochs: Use the drm_driver.dumb_destroy default 2017-08-16 20:18:55 +02:00
bridge drm/bridge/sii8620: add remote control support 2017-10-11 13:14:25 +02:00
cirrus drm/cirrus: Use the drm_driver.dumb_destroy default 2017-08-16 20:14:22 +02:00
etnaviv Merge branch 'etnaviv/fixes' of https://git.pengutronix.de/git/lst/linux into drm-fixes 2017-09-28 05:48:53 +10:00
exynos Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-09-28 05:46:15 +10:00
fsl-dcu drm/fsl-dcu: Use drm_gem_fb_create() 2017-10-01 17:00:20 +02:00
gma500 drm/gma500: use ARRAY_SIZE 2017-10-16 11:29:05 +02:00
hisilicon drm/kirin: Checking for IS_ERR() instead of NULL 2017-10-12 14:09:45 -04:00
i2c drm: i2c: tda998x: constify i2c_device_id 2017-08-22 08:33:44 +02:00
i810
i915 Merge tag 'drm-intel-next-2017-09-07' of git://anongit.freedesktop.org/git/drm-intel into drm-next 2017-09-28 07:12:44 +10:00
imx Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-09-28 05:46:15 +10:00
lib mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
mediatek drm/mediatek: hdmi: clean up drm_bridge_add call 2017-08-21 08:49:24 +05:30
meson drm/meson: Use drm_gem_fb_create() 2017-10-01 17:01:39 +02:00
mga
mgag200 drm/mgag200: Use the drm_driver.dumb_destroy default 2017-08-16 20:18:22 +02:00
msm drm/msm/mdp5: remove less than 0 comparison for unsigned value 2017-10-11 13:17:52 +02:00
mxsfb drm/mxsfb: Use drm_gem_fb_create() and drm_gem_fb_prepare_fb() 2017-10-01 17:02:20 +02:00
nouveau dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
omapdrm drm/omap: work-around for omap3 display enable 2017-08-23 12:22:12 +03:00
panel drm/panel: Add support for the Raspberry Pi 7" Touchscreen. 2017-10-06 12:10:16 -07:00
pl111 drm/pl111: Add handling of Versatile platforms 2017-09-10 23:58:42 +02:00
qxl qxl: fix framebuffer unpinning 2017-09-25 08:35:53 +02:00
r128
radeon Linux 4.14-rc3 2017-10-03 09:35:04 +10:00
rcar-du drm/rcar-du: Use drm_gem_fb_create() 2017-10-01 17:02:53 +02:00
rockchip drm/rockchip: add PINCTRL dependency for LVDS 2017-10-13 09:43:16 +08:00
savage
selftests mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
shmobile drm/shmobile: Use drm_gem_fb_create() 2017-10-01 17:03:22 +02:00
sis
sti drm/sti: Use drm_gem_fb_create() 2017-08-27 19:30:49 +02:00
stm drm/stm: ltdc: remove bridge from driver internal structure 2017-10-10 11:32:48 +02:00
sun4i drm/sun4i: Implement endpoint parsing using kfifo 2017-10-17 16:31:31 +02:00
tdfx
tegra drm/tegra: trace: Fix path to include 2017-09-26 11:08:17 +02:00
tilcdc drm/tilcdc: replace reference/unreference() with get/put 2017-09-26 13:12:15 +02:00
tinydrm drm/tinydrm: Remove explicit .best_encoder assignment 2017-10-13 17:34:51 +02:00
ttm Merge branch 'drm-next-4.15' of git://people.freedesktop.org/~agd5f/linux into drm-next 2017-09-28 08:37:02 +10:00
tve200 drm/tve200: Use drm_gem_fb_create() and drm_gem_fb_prepare_fb() 2017-10-01 17:04:36 +02:00
udl drm/udl: Reading all edid blocks in DRM/UDL driver 2017-10-16 15:37:19 -04:00
vc4 drm/vc4: Fix pitch setup for T-format scanout. 2017-10-13 16:40:24 -07:00
vgem
via drm/via: use ARRAY_SIZE 2017-10-16 11:29:28 +02:00
virtio Merge airlied/drm-next into drm-misc-next 2017-10-03 11:09:16 +02:00
vmwgfx main drm pull request for 4.14 merge window 2017-09-03 17:02:26 -07:00
zte drm/zte: Use drm_gem_fb_create() 2017-08-27 19:31:06 +02:00
ati_pcigart.c
drm_agpsupport.c drm/agpsupport: Remove extra blank line 2017-09-20 09:54:19 -07:00
drm_atomic.c drm/atomic: Remove unneeded null check for private objects 2017-10-06 11:05:50 +02:00
drm_atomic_helper.c drm/atomic: Check for busy planes/connectors before setting the commit 2017-10-17 14:28:31 +02:00
drm_auth.c
drm_blend.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
drm_bridge.c drm/bridge: change return type of drm_bridge_add function 2017-08-21 08:51:53 +05:30
drm_bufs.c
drm_cache.c
drm_color_mgmt.c
drm_connector.c drm: Try to document legacy DPMS uapi a bit better 2017-09-26 07:12:56 +02:00
drm_context.c
drm_crtc.c drm/crtc: Convert setcrtc ioctl locking to interruptible. 2017-09-13 09:52:05 +02:00
drm_crtc_helper.c drm: Replace kzalloc with kcalloc 2017-10-13 15:49:03 -04:00
drm_crtc_helper_internal.h
drm_crtc_internal.h
drm_debugfs.c
drm_debugfs_crc.c drm/atomic: Prepare drm_modeset_lock infrastructure for interruptible waiting, v2. 2017-09-13 09:50:52 +02:00
drm_dma.c
drm_dp_aux_dev.c
drm_dp_dual_mode_helper.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
drm_dp_helper.c drm/dp: WARN about invalid/unknown link rates and bw codes 2017-10-11 18:41:44 +03:00
drm_dp_mst_topology.c drm/dp/mst: Sideband message transaction to power up/down nodes 2017-09-11 16:03:57 +03:00
drm_drv.c drm: introduce drm_dev_{get/put} functions 2017-09-26 13:12:15 +02:00
drm_dumb_buffers.c
drm_edid.c drm: handle override and firmware EDID at drm_do_get_edid() level 2017-09-19 17:49:25 +03:00
drm_edid_load.c drm: add backwards compatibility support for drm_kms_helper.edid_firmware 2017-09-19 18:11:45 +03:00
drm_encoder.c
drm_encoder_slave.c
drm_fb_cma_helper.c drm/fb-cma-helper: Remove unused functions 2017-10-01 17:05:39 +02:00
drm_fb_helper.c drm: Replace kzalloc with kcalloc 2017-10-13 15:49:03 -04:00
drm_file.c
drm_flip_work.c
drm_fourcc.c
drm_framebuffer.c
drm_gem.c drm: fix typo in drm_gem_get_pages() comment 2017-10-04 18:04:28 +02:00
drm_gem_cma_helper.c drm/gem-cma-helper: Change the level of the allocation failure message 2017-10-16 15:19:57 +02:00
drm_gem_framebuffer_helper.c drm/gem-fb-helper: Improve documentation 2017-10-08 15:02:51 +02:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h drm/syncobj: Add a signal ioctl (v3) 2017-08-29 10:16:25 +10:00
drm_ioc32.c
drm_ioctl.c drm/syncobj: Add a signal ioctl (v3) 2017-08-29 10:16:25 +10:00
drm_irq.c
drm_kms_helper_common.c drm: add backwards compatibility support for drm_kms_helper.edid_firmware 2017-09-19 18:11:45 +03:00
drm_legacy.h
drm_lock.c
drm_memory.c
drm_mipi_dsi.c
drm_mm.c lib/interval_tree: fast overlap detection 2017-09-08 18:26:49 -07:00
drm_mode_config.c
drm_mode_object.c drm: Make __drm_object_property_get_value() static 2017-09-11 15:53:33 +03:00
drm_modes.c
drm_modeset_helper.c
drm_modeset_lock.c drm/atomic: Prepare drm_modeset_lock infrastructure for interruptible waiting, v2. 2017-09-13 09:50:52 +02:00
drm_of.c drm/drm_of: Move drm_of_panel_bridge_remove_function into header. 2017-10-13 16:59:36 +02:00
drm_panel.c
drm_pci.c drm/core: clean up references to drm_dev_unref() 2017-09-27 10:53:12 +02:00
drm_plane.c Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-09-28 05:46:15 +10:00
drm_plane_helper.c drm: Replace kzalloc with kcalloc 2017-10-13 15:49:03 -04:00
drm_prime.c drm/core: clean up references to drm_dev_unref() 2017-09-27 10:53:12 +02:00
drm_print.c
drm_probe_helper.c drm: handle override and firmware EDID at drm_do_get_edid() level 2017-09-19 17:49:25 +03:00
drm_property.c
drm_rect.c
drm_scatter.c
drm_scdc_helper.c Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-09-28 05:46:15 +10:00
drm_simple_kms_helper.c
drm_syncobj.c drm: Add missing __user annotation to drm_syncobj_array_find() 2017-10-13 16:01:06 +03:00
drm_sysfs.c
drm_trace.h drm: Use correct path to trace include 2017-09-05 11:11:18 +02:00
drm_trace_points.c
drm_vblank.c drm/vblank: Fix flip event vblank count 2017-10-12 17:34:28 +03:00
drm_vm.c Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-04 12:21:28 -07:00
drm_vma_manager.c lib/interval_tree: fast overlap detection 2017-09-08 18:26:49 -07:00
Kconfig Merge branch 'drm-next-4.15' of git://people.freedesktop.org/~agd5f/linux into drm-next 2017-09-28 08:37:02 +10:00
Makefile Merge branch 'drm-next-4.15' of git://people.freedesktop.org/~agd5f/linux into drm-next 2017-09-28 08:37:02 +10:00