Commit 95b90afe authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Linus Torvalds
Browse files

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
Signed-off-by: default avatarThomas Gleixner <>
Cc: Alexander Gordeev <>
Cc: Rodolfo Giometti <>
Cc: john stultz <>
Cc: Ingo Molnar <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 97e419a0
......@@ -6,7 +6,7 @@ comment "PPS generators support"
tristate "Parallel port PPS signal generator"
depends on PARPORT
depends on PARPORT && BROKEN
If you say yes here you get support for a PPS signal generator which
utilizes STROBE pin of a parallel port to send PPS signals. It uses
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