Re: kern/60620: Fatal logic inversion in fdtbus_get_u32prop_with_default() breaks usmsc(4) and other FDT drivers

[Nick Hudson <nick.hudson%gmx.co.uk@localhost>]

On 19/08/2026 06:05, jun%soum.co.jp@localhost via gnats wrote:
[snip]

> A fatal regression was introduced in sys/dev/fdt/fdt_subr.c (revision 1.43)
> with the implementation of fdtbus_get_u32prop_with_default().
> The internal logic of of_getprop_uint32() return value checking is inverted:
> ----------------------------------------------------------------------
> static int
> fdtbus_get_u32prop_with_default(int phandle, const char *prop, int dflt)
> {
>         uint32_t val;
>         if (of_getprop_uint32(phandle, prop, &val)) {
>                 val = dflt;
>         }
>         return val;
> }

This isn't a bug.

Also,

$ uname -a
NetBSD rpi2 11.99.7 NetBSD 11.99.7 (GENERIC) #0: Sun Aug 16 16:46:12 BST 2026  nick@Nicks-MacBook-Air.local:/Volumes/Work/netbsd/nick-vchiq/obj.evbarmv7hf-el/sys/arch/evbarm/compile/GENERIC evbarm
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/lto-wrapper
Target: armv7--netbsdelf-eabihf
Configured with: /usr/src/tools/gcc/../../external/gpl3/gcc/dist/configure --target=armv7--netbsdelf-eabihf --enable-long-long --enable-threads --with-bugurl=http://www.NetBSD.org/support/send-pr.html --with-pkgversion='NetBSD nb1 20250721' --with-system-zlib --enable-__cxa_atexit --enable-libstdcxx-time=rt --enable-libstdcxx-threads --with-diagnostics-color=auto-if-env --with-default-libstdcxx-abi=new --with-isl=/var/obj/mknative/evbarm-earmv7hf/usr/src/tooldir.NetBSD-10.0_STABLE-amd64 --with-mpc-lib=/var/obj/mknative/evbarm-earmv7hf/usr/src/external/lgpl3/mpc/lib/libmpc --with-mpfr-lib=/var/obj/mknative/evbarm-earmv7hf/usr/src/external/lgpl3/mpfr/lib/libmpfr --with-gmp-lib=/var/obj/mknative/evbarm-earmv7hf/usr/src/external/lgpl3/gmp/lib/libgmp --with-mpc-include=/usr/src/external/lgpl3/mpc/dist/src --with-mpfr-include=/usr/src/external/lgpl3/mpfr/dist/src --with-gmp-include=/usr/src/external/lgpl3/gmp/lib/libgmp/arch/arm --enable-tls --enable-initfini-array --disable-multilib --disable-libstdcxx-pch --build=armv7--netbsdelf-eabihf --host=armv7--netbsdelf-eabihf --with-sysroot=/var/obj/mknative/evbarm-earmv7hf/usr/src/destdir.evbarm
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.5.0 (nb3 20260326)
$ gcc -Wall -o test_fdt test_fdt_subr.c
$ ./test_fdt
=== FDT Regression Test Bench ===

[Case 1] Property EXISTS (Expected output: 200)
 - ORIGINAL (Buggy): 200  --> PASS
 - FIXED    (Patch): 200  --> PASS

[Case 2] Property DOES NOT EXIST (Expected output: 100)
 - ORIGINAL (Buggy): 100  --> PASS
 - FIXED    (Patch): 100  --> PASS

=== Test finished ===
$

Will check -current shortly