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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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3bff93d64c
The pipe might already have been shut down, and then it's not a good idea to call hw accessor functions. Instead use the same logic as drm_vblank_off which has all the necessary checks to avoid troubles or inconsistency. Noticed by Imre while reviewing my patches to remove some sanity checks from ->get_vblank_counter. v2: Try harder. disable_and_save can still access the vblank stuff when vblank->enabled isn't set. It has to, since vlbank irq could be disable but the pipe is still on when being called from drm_vblank_off. But we still want to use that code for more code sharing. So add a check for vblank->enabled on top - if that's not set we shouldn't have anyone waiting for the vblank. If we have that's a pretty serious bug. The other issue that Imre spotted is drm_vblank_cleanup. That code again calls disable_and_save and so suffers from the same issues. But really drm_irq_uninstall should have cleaned that all up, so replace the code with WARN_ON. Note that we can't delete the timer cleanup since drivers aren't required to use drm_irq_install/uninstall, but can do their own irq handling. v3: Make it clear that all that gunk in drm_irq_uninstall is really just bandaids for UMS races between the irq/vblank code. In UMS userspace is in control of enabling/disabling interrupts in general and vblanks specifically. v4: Imre observed that KMS drivers all call drm_vblank_cleanup before drm_irq_uninstall (as they should), so again the code in there is dead for KMS (due to dev->num_crtcs == 0 after drm_vblank_cleanup). Or should be, so only WARN for KMS - with UMS userspace could try to do evil things. v5: After more discussion on irc we've gone back to v3: the del_timer_sync is required in all cases in drm_vblank_cleanup, but let's restrict the WARN_ON to kms drivers only. Imre was also concerned that bad things could happen without the disable_and_save call. But we immediately free vblank structures afterwards which makes the save useless. And drm_handle_vblank has a check for dev->num_crtcs to avoid surprises with ums. Cc: Imre Deak <imre.deak@intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> Acked-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> |
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| .. | ||
| amd | ||
| armada | ||
| ast | ||
| atmel-hlcdc | ||
| bochs | ||
| bridge | ||
| cirrus | ||
| exynos | ||
| gma500 | ||
| i2c | ||
| i810 | ||
| i915 | ||
| imx | ||
| mga | ||
| mgag200 | ||
| msm | ||
| nouveau | ||
| omapdrm | ||
| panel | ||
| qxl | ||
| r128 | ||
| radeon | ||
| rcar-du | ||
| rockchip | ||
| savage | ||
| shmobile | ||
| sis | ||
| sti | ||
| tdfx | ||
| tegra | ||
| tilcdc | ||
| ttm | ||
| udl | ||
| via | ||
| vmwgfx | ||
| ati_pcigart.c | ||
| drm_agpsupport.c | ||
| drm_atomic_helper.c | ||
| drm_atomic.c | ||
| drm_auth.c | ||
| drm_bufs.c | ||
| drm_cache.c | ||
| drm_context.c | ||
| drm_crtc_helper.c | ||
| drm_crtc_internal.h | ||
| drm_crtc.c | ||
| drm_debugfs.c | ||
| drm_dma.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_fb_cma_helper.c | ||
| drm_fb_helper.c | ||
| drm_flip_work.c | ||
| drm_fops.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_legacy.h | ||
| drm_lock.c | ||
| drm_memory.c | ||
| drm_mipi_dsi.c | ||
| drm_mm.c | ||
| drm_modes.c | ||
| drm_modeset_lock.c | ||
| drm_of.c | ||
| drm_panel.c | ||
| drm_pci.c | ||
| drm_plane_helper.c | ||
| drm_platform.c | ||
| drm_prime.c | ||
| drm_probe_helper.c | ||
| drm_rect.c | ||
| drm_scatter.c | ||
| drm_sysfs.c | ||
| drm_trace_points.c | ||
| drm_trace.h | ||
| drm_vm.c | ||
| drm_vma_manager.c | ||
| Kconfig | ||
| Makefile | ||