Commit 364c8172 authored by Chris Wilson's avatar Chris Wilson

drm/i915/userptr: Make gup errors stickier

Keep any error reported by the gup_worker until we are notified that the
arena has changed (via the mmu-notifier). This has the importance of
making two consecutive calls to i915_gem_object_get_pages() reporting
the same error, and curtailing a loop of detecting a fault and requeueing
a gup_worker.
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-19-chris@chris-wilson.co.uk
parent c58b735f
......@@ -542,8 +542,6 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
}
}
obj->userptr.work = ERR_PTR(ret);
if (ret)
__i915_gem_userptr_set_active(obj, false);
}
obj->userptr.workers--;
......@@ -628,15 +626,14 @@ i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
* to the vma (discard or cloning) which should prevent the more
* egregious cases from causing harm.
*/
if (IS_ERR(obj->userptr.work)) {
/* active flag will have been dropped already by the worker */
ret = PTR_ERR(obj->userptr.work);
obj->userptr.work = NULL;
return ret;
}
if (obj->userptr.work)
if (obj->userptr.work) {
/* active flag should still be held for the pending work */
if (IS_ERR(obj->userptr.work))
return PTR_ERR(obj->userptr.work);
else
return -EAGAIN;
}
/* Let the mmu-notifier know that we have begun and need cancellation */
ret = __i915_gem_userptr_set_active(obj, true);
......
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