.B setpci
operations does what you think it should do.
.TP
+.B -r
+Avoids bus scan if each operation selects a specific device (uses the
+.B -s
+selector with specific domain, bus, slot, and function). This is faster,
+but if the device does not exist, it fails instead of matching an empty
+set of devices.
+.TP
.B --version
Show
.I setpci