Re: [PATCH] N_TTY may block out TQUEUE_BH for too long
Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 16 Nov 1998 14:55:18 +0000 (GMT)
> When reading from an N_TTY line the timer task queue can be blocked out
> for a long time. The problem is that read_chan calls put_user and
> copy_to_user while TQUEUE_BH is disabled, and those calls can sleep.
Actually that can even crash the machine. Consider a page in from a device
that depends on TIMER_BH events for retries..
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