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PR/52438 CVS commit: [netbsd-8] src/sys/external/bsd/drm2

The following reply was made to PR kern/52438; it has been noted by GNATS.

From: "Martin Husemann" <>
Subject: PR/52438 CVS commit: [netbsd-8] src/sys/external/bsd/drm2
Date: Sat, 1 Sep 2018 06:34:01 +0000

 Module Name:	src
 Committed By:	martin
 Date:		Sat Sep  1 06:34:00 UTC 2018
 Modified Files:
 	src/sys/external/bsd/drm2/dist/drm/i915 [netbsd-8]: i915_reg.h
 	src/sys/external/bsd/drm2/dist/drm/ttm [netbsd-8]: ttm_tt.c
 	src/sys/external/bsd/drm2/drm [netbsd-8]: drm_scatter.c
 	src/sys/external/bsd/drm2/linux [netbsd-8]: linux_idr.c
 Log Message:
 Pull up following revision(s) (requested by riastradh in ticket #1003):
 	sys/external/bsd/drm2/dist/drm/i915/intel_sdvo.c: revision 1.8
 	sys/external/bsd/drm2/dist/drm/ttm/ttm_tt.c: revision 1.10
 	sys/external/bsd/drm2/drm/drm_scatter.c: revision 1.4
 	sys/external/bsd/drm2/dist/drm/i915/i915_reg.h: revision 1.2
 	sys/external/bsd/drm2/linux/linux_ww_mutex.c: revision 1.3
 	sys/external/bsd/drm2/linux/linux_ww_mutex.c: revision 1.4
 	sys/external/bsd/drm2/linux/linux_idr.c: revision 1.6
 Pull in upstream commit:
 Author: Ville Syrj=E4l=E4 <>
 Date:   Mon Jun 9 16:20:46 2014 +0300
     drm/i915: Avoid div-by-zero when pixel_multiplier is zero
 On certain platforms pixel_multiplier is read out in
 .get_pipe_config(), but it also gets used to calculate the
 pixel clock in intel_sdvo_get_config(). If the pipe is disabled
 but some SDVO outputs are active, we may end up dividing by zero
 in intel_sdvo_get_config().
 Tweak slightly sketchy logic in linux_idr.
 1. idr_preload can fail if you don't set __GFP_WAIT.
 2. If idr_preload fails, it is wrong for idr_alloc to assert.
 3. There is no way for idr_alloc to know what flags idr_preload got.
 Probably won't *fix* any bugs, but if there is a bug with a missing
 __GFP_WAIT, then we will learn about a trifle sooner.
 Fix error branch in ttm_dma_tt_init to avoid double-free.
 Should fix symptom of PR kern/52438, but who knows what underlying
 problem causes us to reach the error branch in the first place.
 Fix lockdebug_locked annotations.
 When thread A grants ownership to thread B waiting with a context,
 thread B needs to assert lockdebug_locked; otherwise, when it
 releases, lockdebug_unlocked thinks it's releasing an unlocked
 Fixes LOCKDEBUG failure with radeon noticed by martin@.
 more const
 XXX: add a NULL init to avoid a GCC 6 maybe uninit warning.
 Remove UB from definition of symbols in i915_reg.h
 Kernel Undefined Behavior Sanitizer enforces more warnings in build time.
 This makes the build fatal in the drm/i915 code in:
  - intel_ddi_put_crtc_pll(),
  - intel_ddi_clock_get(),
  - intel_ddi_pll_enable(),
  - intel_ddi_setup_hw_pll_state().
 The error message in all the cases says:
   error: case label does not reduce to an integer constant
 Set the type of the value left shifted to unsigned.
 This change is required to build NetBSD/amd64 with KUBSan.
 To generate a diff of this commit:
 cvs rdiff -u -r1.1.1.2 -r1. \
 cvs rdiff -u -r1.7 -r1.7.10.1 \
 cvs rdiff -u -r1.9 -r1.9.6.1 src/sys/external/bsd/drm2/dist/drm/ttm/ttm_tt.c
 cvs rdiff -u -r1.3 -r1.3.22.1 src/sys/external/bsd/drm2/drm/drm_scatter.c
 cvs rdiff -u -r1.5 -r1.5.10.1 src/sys/external/bsd/drm2/linux/linux_idr.c
 cvs rdiff -u -r1.2 -r1.2.10.1 \
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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