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Only check for for relative path on virtio devices. Otherwise it could
break driver loading in some circumstances, notably the IceCat sandbox.
https://gitlab.freedesktop.org/mesa/drm/-/issues/39
Taken from upstream:
https://gitlab.freedesktop.org/mesa/drm/-/commit/57df07572ce45a1b60bae6fb89770388d3abd6dd
diff --git a/xf86drm.c b/xf86drm.c
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3103,15 +3103,18 @@ static int drmParseSubsystemType(int maj, int min)
int subsystem_type;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
- if (!realpath(path, real_path))
- return -errno;
- snprintf(path, sizeof(path), "%s", real_path);
subsystem_type = get_subsystem_type(path);
+ /* Try to get the parent (underlying) device type */
if (subsystem_type == DRM_BUS_VIRTIO) {
+ /* Assume virtio-pci on error */
+ if (!realpath(path, real_path))
+ return DRM_BUS_VIRTIO;
strncat(path, "/..", PATH_MAX);
subsystem_type = get_subsystem_type(path);
- }
+ if (subsystem_type < 0)
+ return DRM_BUS_VIRTIO;
+ }
return subsystem_type;
#elif defined(__OpenBSD__) || defined(__DragonFly__) || defined(__FreeBSD__)
return DRM_BUS_PCI;
@@ -3920,6 +3923,7 @@ process_device(drmDevicePtr *device, const char *d_name,
switch (subsystem_type) {
case DRM_BUS_PCI:
+ case DRM_BUS_VIRTIO:
return drmProcessPciDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_USB:
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