linux-kernel - Re: [PATCH] pch_dma: Fix channel locking

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Message-ID: <4E04206C.5000008@dsn.okisemi.com>
Date:	Fri, 24 Jun 2011 14:28:12 +0900
From:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
CC:	"Wang, Yong Y" <yong.y.wang@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, "Wang, Qi" <qi.wang@...el.com>,
	"toshiharu-linux@....okisemi.com" <toshiharu-linux@....okisemi.com>
Subject: Re: [PATCH] pch_dma: Fix channel locking

Hi Alexander Stein

I couldn't see the issue at all.

(2011/06/23 16:42), Alexander Stein wrote:
> The close and open is actually needed (I had a separate application for that
> yesterday).
Does the above mean that we must delete "close" processing from your
test program, right ?
(Modifying like this, I couldn't see the issue)
> 
> If all is done without closing again, I get the following bug:
> 
Does the above mean that executing your test program many times whose 2
"close" are deleted , did you see the issue ?

My steps like below
Boot Fedora14
Install DMA driver
Install pch_uart driver
Enable DMA (setserial /dev/ttyPCH0 ^low_latency)
Modifying your test program
  Delete 2 close() function.
Compile your test program.
Execute the tp.
Execute the tp.
Execute the tp.
I couldn't see any error message.

-- 
tomoya
OKI SEMICONDUCTOR CO., LTD.
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