From: Karol Herbst Date: Mon, 18 Jan 2021 17:16:06 +0000 (+0100) Subject: drm/nouveau/svm: fail NOUVEAU_SVM_INIT ioctl on unsupported devices X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dcd602cc5fe2803bf532d407cde24ba0b7808ff3;p=linux.git drm/nouveau/svm: fail NOUVEAU_SVM_INIT ioctl on unsupported devices Fixes a crash when trying to create a channel on e.g. Turing GPUs when NOUVEAU_SVM_INIT was called before. Fixes: eeaf06ac1a558 ("drm/nouveau/svm: initial support for shared virtual memory") Signed-off-by: Karol Herbst Signed-off-by: Ben Skeggs --- diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c index 4f69e4c3dafde..1c3f890377d2c 100644 --- a/drivers/gpu/drm/nouveau/nouveau_svm.c +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c @@ -315,6 +315,10 @@ nouveau_svmm_init(struct drm_device *dev, void *data, struct drm_nouveau_svm_init *args = data; int ret; + /* We need to fail if svm is disabled */ + if (!cli->drm->svm) + return -ENOSYS; + /* Allocate tracking for SVM-enabled VMM. */ if (!(svmm = kzalloc(sizeof(*svmm), GFP_KERNEL))) return -ENOMEM;