From: Chris Wilson Date: Thu, 18 Aug 2016 16:16:58 +0000 (+0100) Subject: drm/i915/userptr: Make gup errors stickier X-Git-Tag: v4.9-rc1~41^2~36^2~30 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=364c8172edb5ff0b4650bbd4c45eaab46b84b008;p=karo-tx-linux.git 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: Chris Wilson Reviewed-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-19-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c index 57218cca7e05..be54825ef3e8 100644 --- a/drivers/gpu/drm/i915/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c @@ -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 */ - return -EAGAIN; + 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);