From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date: Tue, 23 Mar 2021 15:49:55 +0000 (+0100)
Subject: drm/i915: Add gem object locking to madvise.
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=aaee716e4acacdd0c7747a34c23817b9d50c1a97;p=linux.git

drm/i915: Add gem object locking to madvise.

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

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> #irc
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-7-maarten.lankhorst@linux.intel.com
---

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5b762d1adac21..45a08758ae0f6 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -963,10 +963,14 @@ 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) {
@@ -1011,6 +1015,8 @@ 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;