netdev - Re: [PATCH] slip: fix NOHZ local_softirq

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Message-ID: <20110810102824.4c4eaefe@lxorguk.ukuu.org.uk>
Date:	Wed, 10 Aug 2011 10:28:24 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	matvejchikov@...il.com
Cc:	Oliver Hartkopp <socketcan@...tkopp.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] slip: fix NOHZ local_softirq_pending 08 warning

>   2) From tty_flip_buffer_push() which schedules the flush_to_ldisc to
> work or calls it directly if the tty->low_latency set.
> 
> So the only thing we must take into account that with tty->low_latency
> set we can be in IRQ context when doing with netif_rx_ni(). But if we

A driver is not permitted to directly call into flush_to_ldisc from an
interrupt so that case doesn't happen.

Alan
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