From 29a9a6a329d10c1988f9d43bb7ed9241c0e5e304 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 7 Mar 2017 13:20:31 +0000 Subject: drm/i915: Store a permanent error in obj->mm.pages commit 0d9dc306e15b59bf50db87ebcb1e2248586d4733 upstream. Once the object has been truncated, it is unrecoverable. To facilitate detection of this state store the error in obj->mm.pages. This is required for the next patch which should be applied to v4.10 (via stable), so we also need to mark this patch for backporting. In that regard, let's consider this to be a fix/improvement too. v2: Avoid dereferencing the ERR_PTR when freeing the object. Fixes: 1233e2db199d ("drm/i915: Move object backing storage manipulation to its own locking") Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20170307132031.32461-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen (cherry picked from commit 4e5462ee843c883790e9609cf560d88960ea4227) Signed-off-by: Jani Nikula Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/i915_gem.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index f0dd6f837a53..5881fa28875e 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2184,6 +2184,7 @@ i915_gem_object_truncate(struct drm_i915_gem_object *obj) */ shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1); obj->mm.madv = __I915_MADV_PURGED; + obj->mm.pages = ERR_PTR(-EFAULT); } /* Try to discard unwanted pages */ @@ -2283,7 +2284,9 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj, __i915_gem_object_reset_page_iter(obj); - obj->ops->put_pages(obj, pages); + if (!IS_ERR(pages)) + obj->ops->put_pages(obj, pages); + unlock: mutex_unlock(&obj->mm.lock); } @@ -2501,7 +2504,7 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj) if (err) return err; - if (unlikely(!obj->mm.pages)) { + if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) { err = ____i915_gem_object_get_pages(obj); if (err) goto unlock; @@ -2579,7 +2582,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, pinned = true; if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) { - if (unlikely(!obj->mm.pages)) { + if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) { ret = ____i915_gem_object_get_pages(obj); if (ret) goto err_unlock; -- cgit v1.2.3