linux-kernel - Re: mutex_lock_slowpath warning using mxser tty driver (input/output error)

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Message-Id: <1238708247.5211.14.camel@cabrera>
Date:	Thu, 02 Apr 2009 23:37:27 +0200
From:	Christophe Lermytte <christophe@...mytte.be>
To:	linux-kernel@...r.kernel.org
Subject: Re: mutex_lock_slowpath warning using mxser tty driver
 (input/output error)

> > It appears to want to lock a mutex in interrupt context, something
> > that's a definite no-no.
> > 
> > CCed the folks who might know a thing or two about the driver.

> Moxa is not a USB driver so the USB trace at the end makes no sense at
> all.

Well, it's not that I faked the traces ;-)

During the first cat, I can see the data transmitted by the device, so I guess the kernel warning is not really blocking for me at this point. 

What is blocking, is the fact that I can only do it once, before I get the input/output error. I found a post about this ( http://lkml.org/lkml/2009/3/24/269 ) and the patch seems to have made it into 2.6.29. Still having a similar issue though...

Regards,
Christophe L.

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