From: Breno Leitao <leitao@linux.vnet.ibm.com>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Very strange data loss with jsm driver
Date: Tue, 02 Aug 2011 11:49:27 -0300 [thread overview]
Message-ID: <4E380E77.1040702@linux.vnet.ibm.com> (raw)
In-Reply-To: <20110802142225.GO8562@caffeine.csclub.uwaterloo.ca>
On 08/02/2011 11:22 AM, Lennart Sorensen wrote:
> 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?
Well, I just found it doing some test cases.
Enabling the driver debug, I found that ->intr is not being called on
the "incorrect" case.
This is the diff of the logs:
jsm 0005:02:00.0: finish
jsm 0005:02:00.0: start
jsm 0005:02:00.0: finish
-jsm 0005:02:00.0: drivers/tty/serial/jsm/jsm_neo.c:1131 uart_poll: 301
-jsm 0005:02:00.0: drivers/tty/serial/jsm/jsm_neo.c:1161 port: 0 type: 3
-jsm 0005:02:00.0: drivers/tty/serial/jsm/jsm_neo.c:750 isr: 2
-jsm 0005:02:00.0: MOD_STAT: sending to parse_modem_sigs
-jsm 0005:02:00.0: neo_parse_modem: port: 0 msignals: 0
-jsm 0005:02:00.0: Port: 0 DTR: 0 RTS: 0 CTS: 0 DSR: 0 RI: 0 CD: 0
jsm 0005:02:00.0: start
jsm 0005:02:00.0: Close. HUPCL set, dropping DTR/RTS
jsm 0005:02:00.0: finish
-jsm 0005:02:00.0: finish.
Anyway, I am still debugging it.
PS: I will look at the stats regression after I fix this one, ok ?
next prev parent reply other threads:[~2011-08-02 14:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 16:04 Very strange data loss with jsm driver Lennart Sorensen
2011-07-29 16:27 ` Alan Cox
2011-07-29 16:53 ` Lennart Sorensen
2011-07-29 18:06 ` Lennart Sorensen
2011-07-29 18:14 ` Alan Cox
2011-07-29 18:13 ` Lennart Sorensen
2011-08-02 14:17 ` Breno Leitao
2011-08-02 14:22 ` Lennart Sorensen
2011-08-02 14:23 ` Lennart Sorensen
2011-08-02 14:49 ` Breno Leitao [this message]
2011-08-02 14:52 ` Lennart Sorensen
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