drm/i915: fix wrong error number report

During driver load it's considered that the i915_driver_create()
function fails only in case of insufficient memory. Indeed, in
case of failure of i915_driver_create(), the load function
returns indiscriminately -ENOMEM ignoring the real cause of
failure.

In i915_driver_create() get the consistent error value from
drm_dev_init() and embed it in the pointer return value.

Signed-off-by: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20181002092047.14705-1-andi.shyti@intel.com

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 1b028f4..1930234 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1627,14 +1627,16 @@ i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
                (struct intel_device_info *)ent->driver_data;
        struct intel_device_info *device_info;
        struct drm_i915_private *i915;
+       int err;
 
        i915 = kzalloc(sizeof(*i915), GFP_KERNEL);
        if (!i915)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
-       if (drm_dev_init(&i915->drm, &driver, &pdev->dev)) {
+       err = drm_dev_init(&i915->drm, &driver, &pdev->dev);
+       if (err) {
                kfree(i915);
-               return NULL;
+               return ERR_PTR(err);
        }
 
        i915->drm.pdev = pdev;
@@ -1683,8 +1685,8 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
        int ret;
 
        dev_priv = i915_driver_create(pdev, ent);
-       if (!dev_priv)
-               return -ENOMEM;
+       if (IS_ERR(dev_priv))
+               return PTR_ERR(dev_priv);
 
        /* Disable nuclear pageflip by default on pre-ILK */
        if (!i915_modparams.nuclear_pageflip && match_info->gen < 5)