Re: [PATCH v7 2/4] driver core: add deferring probe reason to devices_deferred property

[Andy Shevchenko]

On Tue, Jun 30, 2020 at 11:32 AM Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote:
> On 29.06.2020 18:36, Andy Shevchenko wrote:
> > On Mon, Jun 29, 2020 at 2:22 PM Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote:
> >> /sys/kernel/debug/devices_deferred property contains list of deferred devices.
> >> This list does not contain reason why the driver deferred probe, the patch
> >> improves it.
> >> The natural place to set the reason is dev_err_probe function introduced recently,
> >> ie. if dev_err_probe will be called with -EPROBE_DEFER instead of printk the message
> >> will be attached to deferred device and printed when user read devices_deferred
> > to a deferred
> >
> > reads
> OK, thx.
> >
> >> property.

...

> >>          list_for_each_entry(curr, &deferred_probe_pending_list, deferred_probe)
> >> -               seq_printf(s, "%s\n", dev_name(curr->device));
> >> +               seq_printf(s, "%s\t%s", dev_name(curr->device),
> >> +                          curr->device->p->deferred_probe_reason ?: "\n");
> > Hmm... "\t" will be dangling in the latter case
>
>
> Hmm, I followed your advice [1] :)
>
> [1]:
> https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1787370.html

Ah, indeed :-)
Okay, as I  said I'm fine with the code. Since it's debugfs, we are fine.

-- 
With Best Regards,
Andy Shevchenko