On Sun Sep 27, 2026 at 6:50 PM CEST, Greg Kroah-Hartman wrote:
> Huh? That feels wrong, can't we fix s390 and spi instead? Ok, maybe
> not s390, but why is spi doing that?
Solely to preserve SPI's existing output; when driver_override is unset, SPI has
always printed "\n", whereas most other buses print "(null)\n".
I.e. SPI previously did
sysfs_emit(buf, "%s\n", spi->driver_override ? : "");
now it does
sysfs_emit(buf, "%s\n", dev->driver_override.name ?: "");
and the driver core does
sysfs_emit(buf, "%s\n", dev->driver_override.name);
The driver-core behavior matches most other buses (except SPI and AP).
Switching SPI to it would have changed the userspace-visible value.
