# Re: \[PATCH v2 net-next 04/15\] net: dsa: sja1105: prepare regmap for passing to child devices

- From: Andy Shevchenko \<andriy.shevchenko@linux.intel.com\>
- Date: 2026-01-22 16:34:31 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/01/3382682
- Thread: https://ratatoskr.run/netdev/2026/01/3381930/t.md

```text
On Thu, Jan 22, 2026 at 04:17:59PM +0000, Russell King (Oracle) wrote:
> On Thu, Jan 22, 2026 at 04:54:11PM +0200, Andy Shevchenko wrote:
> > On Thu, Jan 22, 2026 at 03:42:45PM +0200, Vladimir Oltean wrote:
> > > I never understood the point of dev_err_probe() when you know the return
> > > code can never be -EPROBE_DEFER.
> > 
> > i) Smaller code; ii) no need to care about: a) deferred probe cases;
> > b) -ENOMEM cases.  I see only benefits here by using it.
> 
> Isn't it also used for /sys/kernel/debug/devices_deferred to report to
> the user ?
> 
> E.g.
> 
> supply-voltage-monitor  iio_hwmon: Failed to get channels
> 
> produced by drivers/hwmon/iio_hwmon.c::iio_hwmon_probe():
> 
>         channels = devm_iio_channel_get_all(dev);
>         if (IS_ERR(channels)) {
>                 ret = PTR_ERR(channels);
>                 if (ret == -ENODEV)
>                         ret = -EPROBE_DEFER;
>                 return dev_err_probe(dev, ret,
>                                      "Failed to get channels\n");
>         }

Yes, that's what I imply by "deferred probe cases".

-- 
With Best Regards,
Andy Shevchenko


```