Re: [PATCH 1/4] rust: pci: make Vendor::from_raw() public

[Gary Guo]

On Sun Jun 14, 2026 at 4:59 PM BST, Maurice Hieronymus wrote:
> Vendor::from_raw() is currently pub(super), so a Vendor can only be
> obtained through the named constants generated from the PCI_VENDOR_ID_*
> defines in <linux/pci_ids.h>. A driver therefore cannot match a device
> whose vendor ID has no symbolic name.

nit: quote these code blocks inside commit text for visual clarity
>
> Such devices exist. QEMU's "edu" educational device and the legacy
> qemu/Bochs stdvga both use vendor ID 0x1234, which is not registered in
> pci_ids.h. Per the policy stated at the top of that header, IDs are only
> added there when shared between multiple drivers; a single-driver ID is
> expected to be open-coded in the driver instead. C drivers already do
> this -- see drivers/gpu/drm/tiny/bochs.c, which matches with a bare
> ".vendor = 0x1234".
>
> The Rust abstraction has no equivalent escape hatch: there is no public
> way to express an unregistered vendor. Make Vendor::from_raw() public (and
> const, so it can be used in the const device-ID tables built by
> pci_device_table!) so that drivers can construct a Vendor from a raw ID,
> matching what C drivers can already do.
>
> Signed-off-by: Maurice Hieronymus <mhi@xxxxxxxxxxx>

Reviewed-by: Gary Guo <gary@xxxxxxxxxxx>

> ---
>  rust/kernel/pci/id.rs | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/rust/kernel/pci/id.rs b/rust/kernel/pci/id.rs
> index 50005d176561..bd3cf17fd8de 100644
> --- a/rust/kernel/pci/id.rs
> +++ b/rust/kernel/pci/id.rs
> @@ -156,7 +156,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
>  impl Vendor {
>      /// Create a Vendor from a raw 16-bit vendor ID.
>      #[inline]
> -    pub(super) fn from_raw(vendor_id: u16) -> Self {
> +    pub const fn from_raw(vendor_id: u16) -> Self {
>          Self(vendor_id)
>      }
>