From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 18 Apr 2017 14:11:20 +0200
Subject: drm/cma-helper: Return ENOENT for "no such gem obj"
Git-commit: 765393db20e34b8ad9c1c6a71a793d17d23f4aa5
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

All the error codes we (ab)use are strictly not the right ones (since
they're all for the vfs, and the only thing we're allowed to do from
an ioctl is EINVAL). But ENOENT is the common error code for failed to
look up an object throughout drm, so let's use it in the cma helpers,
too.

Note that this does change uabi for some drivers, but that shouldn't
ba a problem:
- other drivers (e.g. i915) already return ENOENT for invalid gem bo
- userspace tends to only check for errors, not specific ones (except
  when ioctl restarting is needed)
- if the gem bo isn't there a previous step (either creating or
  importing it) failed already, this situation should always be a
  userspace bug.

Changing it does help with debugging userspace bugs though, by making
error reporting more consistent.

Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170418121120.31862-1-daniel.vetter@ffwll.ch

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/drm_fb_cma_helper.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -189,7 +189,7 @@ struct drm_framebuffer *drm_fb_cma_creat
 		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
 		if (!obj) {
 			dev_err(dev->dev, "Failed to lookup GEM object\n");
-			ret = -ENXIO;
+			ret = -ENOENT;
 			goto err_gem_object_put;
 		}