From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Tobias Arp <tobiasarp@gmx.de>
Cc: linux-serial@vger.kernel.org
Subject: Re: ST16C654 stoppes transmitting after a while
Date: Tue, 17 Jul 2012 12:21:40 +0100 [thread overview]
Message-ID: <20120717122140.075aa7ae@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <20120717100521.219440@gmx.net>
On Tue, 17 Jul 2012 12:05:21 +0200
"Tobias Arp" <tobiasarp@gmx.de> wrote:
> I run kernel 3.2. Upgrading to a newer kernel would be not se easy at the moment.
3.2 is certainly new enough that it should have all the major fixes in.
> I am not sure how to check if this change is really lost.
With a debugger dump the state of the port structures one the hung port
once it has hung. Something like Red Hat's systemtap might also be very
helpful in doing this kind of monitoring.
My first guess would be that you hit a race between the port stopping on
one processor and the flow control event on another. We have one known
case there still being debugged but I thought it could only be hit if you
were using ttys in low latency mode.
Alan
next prev parent reply other threads:[~2012-07-17 11:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-17 7:43 ST16C654 stoppes transmitting after a while Tobias Arp
2012-07-17 9:52 ` Alan Cox
2012-07-17 10:05 ` Tobias Arp
2012-07-17 11:21 ` Alan Cox [this message]
2012-07-17 11:36 ` Tobias Arp
2012-07-17 16:38 ` Alan Cox
2012-07-18 6:37 ` Tobias Arp
2012-07-18 7:45 ` Tobias Arp
2012-07-18 11:08 ` Alan Cox
2012-07-18 11:16 ` Tobias Arp
2012-07-20 4:25 ` Tobias Arp
2012-07-20 10:10 ` Tobias Arp
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