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drm/i915: grab dev->struct_mutex around framebuffer_init

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We look at gem state (like obj->tiling/obj->stride), we better have
the relevant locks.

Right now this doesn't matter much since most of these checks are
a curtesy to safe buggy userspace, but I'd like to freeze the tiling
once we have framebuffer objects attached. And then locking matters.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2013-10-09 21:23:51 +02:00
parent 533df0fecd
commit dd4916c55a
1 changed files with 14 additions and 5 deletions
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19
drivers/gpu/drm/i915/intel_display.c
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@ -7285,14 +7285,21 @@ intel_framebuffer_create(struct drm_device *dev,
return ERR_PTR(-ENOMEM);
}
ret = i915_mutex_lock_interruptible(dev);
if (ret)
goto err;
ret = intel_framebuffer_init(dev, intel_fb, mode_cmd, obj);
if (ret) {
drm_gem_object_unreference_unlocked(&obj->base);
kfree(intel_fb);
return ERR_PTR(ret);
}
mutex_unlock(&dev->struct_mutex);
if (ret)
goto err;
return &intel_fb->base;
err:
drm_gem_object_unreference_unlocked(&obj->base);
kfree(intel_fb);
return ERR_PTR(ret);
}
static u32
@ -9989,6 +9996,8 @@ int intel_framebuffer_init(struct drm_device *dev,
int pitch_limit;
int ret;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
if (obj->tiling_mode == I915_TILING_Y) {
DRM_DEBUG("hardware does not support tiling Y\n");
return -EINVAL;