linux-kernel - Re: [PATCH v9 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support

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Date:	Wed, 28 Jan 2015 11:54:01 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Lyra Zhang <zhang.lyra@...il.com>
Cc:	Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Mark Rutland <mark.rutland@....com>,
	"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
	Heiko Stübner <heiko@...ech.de>,
	"andrew@...n.ch" <andrew@...n.ch>,
	"jslaby@...e.cz" <jslaby@...e.cz>,
	"lanqing.liu@...eadtrum.com" <lanqing.liu@...eadtrum.com>,
	Arnd Bergmann <arnd@...db.de>,
	"zhizhou.zhang" <zhizhou.zhang@...eadtrum.com>,
	"geng.ren@...eadtrum.com" <geng.ren@...eadtrum.com>,
	"antonynpavlov@...il.com" <antonynpavlov@...il.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Orson Zhai <orsonzhai@...il.com>,
	"florian.vaussard@...l.ch" <florian.vaussard@...l.ch>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Hayato Suzuki <hytszk@...il.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Wei Qiao (乔伟) <wei.qiao@...eadtrum.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Peter Hurley <peter@...leysoftware.com>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH v9 2/2] tty/serial: Add Spreadtrum sc9836-uart driver
 support

Hi Lyra Zhang,

On Wed, Jan 28, 2015 at 04:46:33PM +0800, Lyra Zhang wrote:
> On Wed, Jan 28, 2015 at 2:12 PM, Baruch Siach <baruch@...s.co.il> wrote:
> > On Wed, Jan 28, 2015 at 10:47:41AM +0800, Chunyan Zhang wrote:
> >> +             if (uart_handle_sysrq_char(port, ch))
> >> +                     continue;
> >
> > My comment[1] on a previous version of this patch still stands.
> > uart_handle_sysrq_char is a NOP when SUPPORT_SYSRQ is not defined.
> 
> yes, there are two definitions in serial_core.h, and it returns 0 when
> SUPPORT_SYSRQ is not defined.
> so, I think my code behavior does not hurt, right?

Right. I just wanted to point out that you can easily define SUPPORT_SYSRQ as 
appropriate like many other serial drivers do to get sysrq support.

baruch

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