sd-device: Try /sys/firmware for sysname to allow device-tree (#5837)

This adds /sys/firmware lookup for sysname when creating a new device,
which allows device-tree properties lookup. This look-up can then be
used in udev rules, allowing device-tree-based model detection.

diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index c56ae39c9fe230b5f1dabc3121e800e2dfbc78e7..d65e716da566a35433d3791851d74ed1bb2e5779 100644 (file)
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -324,6 +324,10 @@ _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *s
         if (access(syspath, F_OK) >= 0)
                 return sd_device_new_from_syspath(ret, syspath);
 
+        syspath = strjoina("/sys/firmware/", subsystem, "/", sysname);
+        if (access(syspath, F_OK) >= 0)
+                return sd_device_new_from_syspath(ret, syspath);
+
         return -ENODEV;
 }