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220dd2bc43
linux/drivers/gpu/drm
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Daniel Vetter 220dd2bc43 drm: Fixup racy refcounting in plane_force_disable 
Originally it was impossible to be dropping the last refcount in this
function since there was always one around still from the idr. But in

commit 83f45fc360
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Aug 6 09:10:18 2014 +0200

    drm: Don't grab an fb reference for the idr

we've switched to weak references, broke that assumption but forgot to
fix it up.

Since we still force-disable planes it's only possible to hit this
when racing multiple rmfb with fbdev restoring or similar evil things.
As long as userspace is nice it's impossible to hit the BUG_ON.

But the BUG_ON would most likely be hit from fbdev code, which usually
invovles the console_lock besides all modeset locks. So very likely
we'd never get the bug reports if this was hit in the wild, hence
better be safe than sorry and backport.

Spotted by Matt Roper while reviewing other patches.

Cc: stable@vger.kernel.org
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
2015-03-10 09:59:33 +01:00
..
amd drm/amdkfd: don't set get_pipes_num() as inline 2015-02-23 10:48:02 +02:00
armada Merge tag 'topic/core-stuff-2014-12-19' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-01-09 09:13:41 +10:00
ast drm/fb-helper: Propagate errors from initial config failure 2015-01-21 14:57:03 +01:00
atmel-hlcdc Linux 4.0-rc3 2015-03-09 19:58:30 +10:00
bochs drm/fb-helper: Propagate errors from initial config failure 2015-01-21 14:57:03 +01:00
bridge drm/bridge: dw-hdmi: Adapt to bridge API change 2015-01-28 10:01:30 +01:00
cirrus Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-02-16 15:48:00 -08:00
exynos Merge branch 'exynos-drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos into drm-next 2015-02-13 13:02:49 +10:00
gma500 drm/fb-helper: Propagate errors from initial config failure 2015-01-21 14:57:03 +01:00
i2c Merge branch 'drm-tda998x-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-03-05 09:37:19 +10:00
i810
i915 drm/i915: Rotation property is now handled in DRM core 2015-03-10 09:59:33 +01:00
imx DRM: i.MX: parallel display: Support probe deferral for finding DRM panel 2015-02-23 17:19:25 +01:00
mga
mgag200 drm/fb-helper: Propagate errors from initial config failure 2015-01-21 14:57:03 +01:00
msm Linux 4.0-rc3 2015-03-09 19:58:30 +10:00
nouveau drm/ttm: device address space != CPU address space 2015-03-05 09:04:39 +10:00
omapdrm drm/fb-helper: Propagate errors from initial config failure 2015-01-21 14:57:03 +01:00
panel drm: panel/simple: add backlight dependency 2015-01-31 10:11:45 +10:00
qxl drm/fb-helper: Propagate errors from initial config failure 2015-01-21 14:57:03 +01:00
r128
radeon drm/radeon: fix interlaced modes on DCE8 2015-03-03 17:28:31 -05:00
rcar-du drm: rcar-du: Fix race condition in hardware plane allocator 2015-03-03 16:16:30 +02:00
rockchip Revert "drm/rockchip: Flip select/depends in Kconfig" 2015-03-03 21:11:34 +10:00
savage
shmobile drm: Kconfig: Let all DRM_GEM_CMA_HELPER related macros depend on HAVE_DMA_ATTRS 2015-02-03 11:12:37 +10:00
sis
sti drm: sti: HDMI add audio infoframe 2015-02-05 16:21:19 +01:00
tdfx
tegra Linux 4.0-rc3 2015-03-09 19:58:30 +10:00
tilcdc drm: Kconfig: Let all DRM_GEM_CMA_HELPER related macros depend on HAVE_DMA_ATTRS 2015-02-03 11:12:37 +10:00
ttm drm/ttm: device address space != CPU address space 2015-03-05 09:04:39 +10:00
udl drm/udl: properly set active_16 flag in udl_crtc_page_flip(). (v2) 2015-01-31 10:12:23 +10:00
via
vmwgfx drm/vmwgfx: Replace the hw mutex with a hw spinlock 2015-01-19 03:02:13 -08:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic_helper.c drm/atomic-helper: Fix kerneldoc for prepare_planes 2015-03-10 09:59:31 +01:00
drm_atomic.c drm: Complete moving rotation property to core 2015-03-10 09:59:32 +01:00
drm_auth.c
drm_bridge.c drm/bridge: make bridge registration independent of drm flow 2015-01-28 08:45:40 +01:00
drm_bufs.c
drm_cache.c
drm_context.c
drm_crtc_helper.c drm: add support for tiled/compressed/etc modifier in addfb2 2015-02-13 23:28:12 +01:00
drm_crtc_internal.h drm/atomic: Hide drm.ko internal interfaces 2015-01-05 13:55:30 +01:00
drm_crtc.c drm: Fixup racy refcounting in plane_force_disable 2015-03-10 09:59:33 +01:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c drm/dp: add drm_dp_link_power_down() helper 2015-02-01 15:06:42 -05:00
drm_dp_mst_topology.c
drm_drv.c drm: add atomic properties 2015-01-05 13:54:38 +01:00
drm_edid_load.c
drm_edid.c
drm_encoder_slave.c
drm_fb_cma_helper.c
drm_fb_helper.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-02-16 15:48:00 -08:00
drm_flip_work.c
drm_fops.c drm: Make drm_read() more robust against multithreaded races 2015-01-21 14:57:03 +01:00
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: add support for tiled/compressed/etc modifier in addfb2 2015-02-13 23:28:12 +01:00
drm_irq.c Merge tag 'drm-intel-next-2015-02-27' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-03-09 19:41:15 +10:00
drm_legacy.h
drm_lock.c
drm_memory.c
drm_mipi_dsi.c drm/mipi-dsi: Avoid potential NULL pointer dereference 2015-01-28 08:45:37 +01:00
drm_mm.c drm/mm: Support 4 GiB and larger ranges 2015-03-05 09:01:37 +10:00
drm_modes.c drm/modes: Print the mode status in human readable form 2015-02-03 09:09:22 +01:00
drm_modeset_lock.c
drm_of.c
drm_panel.c
drm_pci.c
drm_plane_helper.c drm: Pass in new and old plane state to prepare_fb and cleanup_fb 2015-03-05 09:49:02 +10:00
drm_platform.c
drm_prime.c
drm_probe_helper.c drm/probe-helper: clamp unknown connector status in the poll work 2015-01-22 06:11:39 +01:00
drm_rect.c
drm_scatter.c
drm_sysfs.c drm: Use static attribute groups for managing connector sysfs entries 2015-02-04 15:02:00 +01:00
drm_trace_points.c
drm_trace.h
drm_vm.c
drm_vma_manager.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2015-02-10 14:30:31 -08:00
Kconfig drm: Kconfig: Let all DRM_GEM_CMA_HELPER related macros depend on HAVE_DMA_ATTRS 2015-02-03 11:12:37 +10:00
Makefile drm/bridge: make bridge registration independent of drm flow 2015-01-28 08:45:40 +01:00