Re: [PATCH net-next 07/15] net: dsa: mt7530: do not run mt7530_setup_port5() if port 5 is disabled

[Arınç ÜNAL]

On 8.12.2023 21:46, Vladimir Oltean wrote:
> Hmm, maybe the problem, all along, was that we let the -ENODEV return
> code from of_get_phy_mode() pass through? "interface" will really be
> uninitialized in that case. It's not a false positive.
>
> Instead of:
>
> 	ret = of_get_phy_mode(mac_np, &interface);
> 	if (ret && ret != -ENODEV) {
> 		...
> 		return ret;
> 	}
>
> it should have been like this, to not complain:
>
> 	ret = of_get_phy_mode(mac_np, &interface);
> 	if (ret) {
> 		...
> 		return ret;
> 	}

I just tried this, smatch still reports "interface" as uninitialised.

$ export ARCH=mips CROSS_COMPILE=mips-linux-gnu-
$ ../smatch/smatch_scripts/kchecker --spammy drivers/net/dsa/mt7530.c

  UPD     include/config/kernel.release
  UPD     include/generated/utsrelease.h
  CHECK   scripts/mod/empty.c
  CALL    scripts/checksyscalls.sh
  CC      drivers/net/dsa/mt7530.o
  CHECK   drivers/net/dsa/mt7530.c
drivers/net/dsa/mt7530.c:217 mt7530_mii_read() warn: call of 'warn_slowpath_fmt' with non-constant format argument
drivers/net/dsa/mt7530.c:454 mt7530_setup_port6() error: uninitialized symbol 'ncpo1'.
drivers/net/dsa/mt7530.c:868 mt7530_set_ageing_time() error: uninitialized symbol 'age_count'.
drivers/net/dsa/mt7530.c:868 mt7530_set_ageing_time() error: uninitialized symbol 'age_unit'.
drivers/net/dsa/mt7530.c:2324 mt7530_setup() error: uninitialized symbol 'interface'.

Arınç