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

- From: Russell King (Oracle) \<linux@armlinux.org.uk\>
- Date: 2026-01-22 16:18:11 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/01/3382638
- Thread: https://ratatoskr.run/netdev/2026/01/3381930/t.md

```text
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");
        }


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```