[Intel-gfx] [RFC PATCH 015/162] drm/i915: Add gem object locking to madvise.

[Matthew Auld]

From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

Doesn't need the full ww lock, only checking if pages are bound.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 58276694c848..b03e245640c0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1051,10 +1051,14 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
-	err = mutex_lock_interruptible(&obj->mm.lock);
+	err = i915_gem_object_lock_interruptible(obj, NULL);
 	if (err)
 		goto out;
 
+	err = mutex_lock_interruptible(&obj->mm.lock);
+	if (err)
+		goto out_ww;
+
 	if (i915_gem_object_has_pages(obj) &&
 	    i915_gem_object_is_tiled(obj) &&
 	    i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
@@ -1099,6 +1103,8 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 	args->retained = obj->mm.madv != __I915_MADV_PURGED;
 	mutex_unlock(&obj->mm.lock);
 
+out_ww:
+	i915_gem_object_unlock(obj);
 out:
 	i915_gem_object_put(obj);
 	return err;
-- 
2.26.2