linux-kernel - Re: Very strange data loss with jsm driver

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Message-ID: <20110802142225.GO8562@caffeine.csclub.uwaterloo.ca>
Date:	Tue, 2 Aug 2011 10:22:25 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Breno Leitao <leitao@...ux.vnet.ibm.com>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Very strange data loss with jsm driver

On Tue, Aug 02, 2011 at 11:17:52AM -0300, Breno Leitao wrote:
> Well, I finally tested it over here, and what I found is:
> 
> If the line has a \r among the first 16 bytes, then the information
> is TXed immediately. If there is no \r in the first 16 bytes, then the
> information seems to be buffered.

Where in the driver is this happening?

> So, it seems that that the patch should ask the driver to TX the
> information when we receive a \r or when the buffer is full. Does it
> make sense to you ?

Not sure.  I just wonder why the data is disappearing rather than getting
buffered somewhere.  Clearly the other serial drivers are doing that
successfully.

I don't even know why the driver should care about the contents at all.
Just send data when it is ready.

-- 
Len Sorensen
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