[PATCH v3] drm/display: use ERR_PTR on DP tunnel manager creation fail

[Krzysztof Karas]

Instead of returning a generic NULL on error from
drm_dp_tunnel_mgr_create(), use error pointers with informative codes
to align the function with stub that is executed when
CONFIG_DRM_DISPLAY_DP_TUNNEL is unset. This will also trigger IS_ERR()
in current caller (intel_dp_tunnerl_mgr_init()) instead of bypassing it
via NULL pointer.

v2: use error codes inside drm_dp_tunnel_mgr_create() instead of handling
 on caller's side (Michal, Imre)

v3: fixup commit message and add "CC"/"Fixes" lines (Andi),
 mention aligning function code with stub
    
Fixes: 91888b5b1ad2 ("drm/i915/dp: Add support for DP tunnel BW allocation")
Cc: Imre Deak <imre.d...@intel.com>
Cc: <sta...@vger.kernel.org> # v6.9+
Signed-off-by: Krzysztof Karas <krzysztof.ka...@intel.com>
Reviewed-by: Andi Shyti <andi.sh...@linux.intel.com>
---
 drivers/gpu/drm/display/drm_dp_tunnel.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dp_tunnel.c 
b/drivers/gpu/drm/display/drm_dp_tunnel.c
index 48b2df120086..90fe07a89260 100644
--- a/drivers/gpu/drm/display/drm_dp_tunnel.c
+++ b/drivers/gpu/drm/display/drm_dp_tunnel.c
@@ -1896,8 +1896,8 @@ static void destroy_mgr(struct drm_dp_tunnel_mgr *mgr)
  *
  * Creates a DP tunnel manager for @dev.
  *
- * Returns a pointer to the tunnel manager if created successfully or NULL in
- * case of an error.
+ * Returns a pointer to the tunnel manager if created successfully or error
+ * pointer in case of failure.
  */
 struct drm_dp_tunnel_mgr *
 drm_dp_tunnel_mgr_create(struct drm_device *dev, int max_group_count)
@@ -1907,7 +1907,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int 
max_group_count)
 
        mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
        if (!mgr)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
        mgr->dev = dev;
        init_waitqueue_head(&mgr->bw_req_queue);
@@ -1916,7 +1916,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int 
max_group_count)
        if (!mgr->groups) {
                kfree(mgr);
 
-               return NULL;
+               return ERR_PTR(-ENOMEM);
        }
 
 #ifdef CONFIG_DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG
@@ -1927,7 +1927,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int 
max_group_count)
                if (!init_group(mgr, &mgr->groups[i])) {
                        destroy_mgr(mgr);
 
-                       return NULL;
+                       return ERR_PTR(-ENOMEM);
                }
 
                mgr->group_count++;
-- 
2.34.1