linux-kernel - Re: [PATCH] serial: uart: add hw flow control support configuration

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Message-ID: <20140424233027.GA21443@kroah.com>
Date:	Thu, 24 Apr 2014 16:30:27 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	"Karicheri, Muralidharan" <m-karicheri2@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"Balbi, Felipe" <balbi@...com>, Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] serial: uart: add hw flow control support configuration

On Wed, Apr 23, 2014 at 03:27:17PM +0100, One Thousand Gnomes wrote:
> > >-	if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) {
> > >+	if ((up->capabilities & UART_CAP_AFE && (port->fifosize >= 32)) ||
> > >+	    port->flags & UPF_HARD_FLOW) {
> > 
> > [Alan] Surely you want brackets on the port->flags & UPF_HARD_FLOW ??
> > 
> > The C precedence table shows following order:=
> > -> & ||
> > 
> > So flags will be accessed first and then AND-ed with  UPF_HARD_FLOW and
> > result will be OR-ed with left side expression value. So no need for bracket IMO.
> 
> Yep... agreed.

Perhaps, but please put them there so we all _know_ what it is doing is
correct.

greg k-h
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