linux-kernel - Re: [PATCH 09/22] ncr5380: Adopt uniform DMA setup convention

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Date:	Tue, 15 Mar 2016 14:19:58 +1100 (AEDT)
From:	Finn Thain <fthain@...egraphics.com.au>
To:	Hannes Reinecke <hare@...e.de>
cc:	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Michael Schmitz <schmitzmic@...il.com>,
	linux-m68k@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Ondrej Zary <linux@...nbow-software.org>,
	Sam Creasey <sammy@...my.net>
Subject: Re: [PATCH 09/22] ncr5380: Adopt uniform DMA setup convention


On Mon, 14 Mar 2016, Hannes Reinecke wrote:

> > @@ -1555,8 +1555,7 @@ static int NCR5380_transfer_dma(struct S
> >  	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> >  	*data = d + c;
> >  	*count = 0;
> > -	*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
> > -	return foo;
> > +	return result;
> >  }
> >  
> >  /*
> 
> Don't you miss a phase update here?

I guess I missed explaining the change in the commit log.

The *phase assignment is redundant because after NCR5380_transfer_dma() 
returns control to NCR5380_information_transfer(), the latter routine then 
also returns, and so *phase is dead.

-- 

> 
> Cheers,
> 
> Hannes
>