[PATCH 5.19 0092/1157] drm/nouveau/kms: Fix failure path for creating DP connectors

Greg Kroah-Hartman
2022-08-15T22:13:24Z

From: Lyude Paul <lyude@redhat.com>

commit ca0367ca5d9216644b41f86348d6661f8d9e32d8 upstream.

It looks like that when we moved nouveau over to using drm_dp_aux_init()
and registering it's aux bus during late connector registration, we totally
forgot to fix the failure codepath in nouveau_connector_create() - as it
still seems to assume that drm_dp_aux_init() can fail (it can't).

So, let's fix that and also add a missing check to ensure that we've
properly allocated nv_connector->aux.name while we're at it.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: David Airlie <airlied@linux.ie>
Fixes: fd43ad9d47e7 ("drm/nouveau/kms/nv50-: Move AUX adapter reg to connector late register/early unregister")
Cc: <stable@vger.kernel.org> # v5.14+
Link: https://patchwork.freedesktop.org/patch/msgid/20220526204313.656473-1-lyude@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/nouveau/nouveau_connector.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -1361,13 +1361,11 @@ nouveau_connector_create(struct drm_devi
snprintf(aux_name, sizeof(aux_name), "sor-%04x-%04x",
dcbe->hasht, dcbe->hashm);
nv_connector->aux.name = kstrdup(aux_name, GFP_KERNEL);
- drm_dp_aux_init(&nv_connector->aux);
- if (ret) {
- NV_ERROR(drm, "Failed to init AUX adapter for sor-%04x-%04x: %d\n",
- dcbe->hasht, dcbe->hashm, ret);
+ if (!nv_connector->aux.name) {
kfree(nv_connector);
- return ERR_PTR(ret);
+ return ERR_PTR(-ENOMEM);
}
+ drm_dp_aux_init(&nv_connector->aux);
fallthrough;
default:
funcs = &nouveau_connector_funcs;