From: Alex Mastro Date: Mon, 8 Sep 2025 15:58:40 +0000 (-0700) Subject: vfio: return -ENOTTY for unsupported device feature X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=16df67f2189a71a8310bcebddb87ed569e8352be;p=users%2Fhch%2Fmisc.git vfio: return -ENOTTY for unsupported device feature The two implementers of vfio_device_ops.device_feature, vfio_cdx_ioctl_feature and vfio_pci_core_ioctl_feature, return -ENOTTY in the fallthrough case when the feature is unsupported. For consistency, the base case, vfio_ioctl_device_feature, should do the same when device_feature == NULL, indicating an implementation has no feature extensions. Signed-off-by: Alex Mastro Link: https://lore.kernel.org/r/20250908-vfio-enotty-v1-1-4428e1539e2e@fb.com Signed-off-by: Alex Williamson --- diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 91a8eae308ea..38c8e9350a60 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1252,7 +1252,7 @@ static int vfio_ioctl_device_feature(struct vfio_device *device, feature.argsz - minsz); default: if (unlikely(!device->ops->device_feature)) - return -EINVAL; + return -ENOTTY; return device->ops->device_feature(device, feature.flags, arg->data, feature.argsz - minsz);