drm/i915: Avoid NULL dereference with component_only tv_modes
In commit d2d9f2324
, the guard for a valid video mode was removed. This
caused the regression:
kernel crash during kms graphic boot on Intel GM4500 platform
https://bugzilla.redhat.com/show_bug.cgi?id=540218
This patches changes the logic slightly not to rely on a coupled
variable, but to just check whether the video_modes is valid before
dereferencing.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Zhenyu Wang <zhenyu.z.wang@intel.com>
[ickle: Actually reference the correct bug report]
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
parent
9bedb9743f
commit
d271817bae
1 changed files with 5 additions and 8 deletions
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@ -1213,20 +1213,17 @@ intel_tv_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
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tv_ctl |= TV_TRILEVEL_SYNC;
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if (tv_mode->pal_burst)
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tv_ctl |= TV_PAL_BURST;
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scctl1 = 0;
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/* dda1 implies valid video levels */
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if (tv_mode->dda1_inc) {
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scctl1 |= TV_SC_DDA1_EN;
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}
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scctl1 = 0;
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if (tv_mode->dda1_inc)
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scctl1 |= TV_SC_DDA1_EN;
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if (tv_mode->dda2_inc)
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scctl1 |= TV_SC_DDA2_EN;
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if (tv_mode->dda3_inc)
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scctl1 |= TV_SC_DDA3_EN;
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scctl1 |= tv_mode->sc_reset;
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scctl1 |= video_levels->burst << TV_BURST_LEVEL_SHIFT;
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if (video_levels)
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scctl1 |= video_levels->burst << TV_BURST_LEVEL_SHIFT;
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scctl1 |= tv_mode->dda1_inc << TV_SCDDA1_INC_SHIFT;
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scctl2 = tv_mode->dda2_size << TV_SCDDA2_SIZE_SHIFT |
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