linux-kernel - Re: [PATCH 3/3] ARM: omap1/ams-delta: warn about failed regulator enable

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Date:	Tue, 23 Feb 2016 16:15:19 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: omap1/ams-delta: warn about failed regulator
 enable

> > It is not easy to propagate that return code to the callers in
> > uart_configure_port/uart_suspend_port/uart_resume_port, unless
> > we change all UART drivers, and it is unclear what those would
> > do with the return code.
> > 
> > Instead, this patch uses a runtime warning to replace the
> > compiletime warning. I have checked that the regulator in question
> > is hardcoded to a fixed-voltage GPIO regulator, and that should
> > never fail to get enabled if I understand the code right.  
> 
> Looks OK to me:

If it was a concern for a real driver I think I'd perform a hangup on the
port at that moment. That's what happens if for example you hot unplug a
serial port which would be approximately the same as finding out you
can't power it back up.

Alan