Linus Torvalds a5660b41af tty: fix endless work loop when the buffer fills up ... Commit f23eb2b2b2 ('tty: stop using "delayed_work" in the tty layer') ended up causing hung machines on UP with no preemption, because the work routine to flip the buffer data to the ldisc would endlessly re-arm itself if the destination buffer had filled up. With the delayed work, that only caused a timer-driving polling of the tty state every timer tick, but without the delay we just ended up with basically a busy loop instead. Stop the insane polling, and instead make the code that opens up the receive room re-schedule the buffer flip work. That's what we should have been doing anyway. This same "poll for tty room" issue is almost certainly also the cause of excessive kworker activity when idle reported by Dave Jones, who also reported "flush_to_ldisc executing 2500 times a second" back in Nov 2010: http://lkml.org/lkml/2010/11/30/592 which is that silly flushing done every timer tick. Wasting both power and CPU for no good reason. Reported-and-tested-by: Alexander Beregalov <a.beregalov@gmail.com> Reported-and-tested-by: Sitsofe Wheeler <sitsofe@yahoo.com> Cc: Greg KH <gregkh@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Dave Jones <davej@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2011-04-04 14:26:54 -07:00
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hvc	drivers: Final irq namespace conversion	2011-03-29 14:48:19 +02:00
ipwireless
serial	apbuart: Depend upon sparc.	2011-03-30 21:12:24 -07:00
vt
amiserial.c
bfin_jtag_comm.c
cyclades.c
isicom.c
Kconfig
Makefile
moxa.c
moxa.h
mxser.c
mxser.h
n_gsm.c
n_hdlc.c
n_r3964.c
n_tty.c	tty: fix endless work loop when the buffer fills up	2011-04-04 14:26:54 -07:00
nozomi.c
pty.c
rocket_int.h
rocket.c
rocket.h
synclink_gt.c
synclink.c
synclinkmp.c
sysrq.c
tty_audit.c
tty_buffer.c	tty: fix endless work loop when the buffer fills up	2011-04-04 14:26:54 -07:00
tty_io.c
tty_ioctl.c
tty_ldisc.c
tty_mutex.c
tty_port.c