linux-kernel - Re: Scheduling while atomic in tty code with cdc-acm driver, kernel 2.6.29.1

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Message-Id: <200904140150.10790.oliver@neukum.org>
Date:	Tue, 14 Apr 2009 01:50:10 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: Scheduling while atomic in tty code with cdc-acm driver, kernel 2.6.29.1

Am Dienstag 14 April 2009 01:36:33 schrieb Chuck Ebbert:
> BUG: sleeping function called from invalid context at kernel/mutex.c:88
> in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper
> Pid: 0, comm: swapper Not tainted 2.6.29.1-54.fc11.x86_64 #1

Is this specific to 2.6.29.1? It looks like setting low_latency, as cdc-acm,
does for legacy reasons, is harmful now. Please remove these lines:


	/* force low_latency on so that our tty_push actually forces the data 
through,
	   otherwise it is scheduled, and with high data rates data can get lost. */
	tty->low_latency = 1;

	HTH
		Oliver

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