pps: make pps_gen_parport depend on BROKEN
authorThomas Gleixner <tglx@linutronix.de>
Sat, 5 Mar 2011 01:36:23 +0000 (17:36 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 5 Mar 2011 01:53:38 +0000 (17:53 -0800)
commit95b90afec301f050f72740e8696f7cce8a37db5a
treebc98958028124b09037f3da11b395f0e6a3c1579
parent97e419a082461f8a3a0818834eb88ad41219a1da
pps: make pps_gen_parport depend on BROKEN

This driver causes hard lockups, when the active clock soure is jiffies.

The reason is that it loops with interrupts disabled waiting for a
timestamp to be reached by polling getnstimeofday().  Though with a
jiffies clocksource, when that code runs on the same CPU which is
responsible for updating jiffies, then we loop in circles for ever
simply because the timer interrupt cannot update jiffies.  So both UP
and SMP can be affected.

There is no easy fix for that problem so make it depend on BROKEN for
now.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Cc: Rodolfo Giometti <giometti@linux.it>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/pps/generators/Kconfig