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From: Klaus Herb <klaus.herb@ikon-gmbh.de>
To: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: ppp_synctty and in_interrupt
Date: Thu, 13 Jun 2002 16:25:33 +0200	[thread overview]
Message-ID: <01C212F6.F1993680.klaus.herb@ikon-gmbh.de> (raw)

Hello,
I am currently developing a tty-Driver which is used for synchronous PPP.

System:
Board		Special Hardware with a Motorola XPC8260 Microcontroller
OS		Elinos V2 with Kernel Version 2.4.3
PPP		pppd and ppp Modules Version 2.4.1

The following Problem occurs:

The ppp_synctty ldisc only calls my ttywrite function in interrupt context. 
But to avoid a race condition I must include a Semaphore in my ttywrite 
function, so I get a Kernel Oops when this Semaphore causes a call to 
schedule().

Is there a way to stop this ppp_synctty ldisc from sending in Interrupt 
Context?
or
Why does this ldisc only write in interrupt context?


Please CC your replay to klaus.herb@ikon-gmbh.de


Thanks!

Klaus Herb

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Klaus Herb
ikon GmbH
Benzstrasse 17
89079 Ulm
Germany

phone  +49/731/94661-0
fax       +49/731/94661-61
mailto:klaus.herb@ikon-gmbh.de
http://www.ikon-gmbh.de
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             reply	other threads:[~2002-06-13 14:27 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-06-13 14:25 Klaus Herb [this message]
2002-06-13 15:06 ` Paul Fulghum

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