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| author | Rob Herring <rob.herring@calxeda.com> | 2013-04-17 10:46:52 -0500 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2013-04-18 09:37:46 -0700 |
| commit | 73053d973dd6f56472309cffa5a5d15a62dd6f96 (patch) | |
| tree | 0a53ecdc88999040c5c1d760740b06c80aed05b9 | |
| parent | 71bd98aff05a644a2cfc3ac6ca848a586fa210b9 (diff) | |
| download | olio-linux-3.10-73053d973dd6f56472309cffa5a5d15a62dd6f96.tar.xz olio-linux-3.10-73053d973dd6f56472309cffa5a5d15a62dd6f96.zip | |
ARM: highbank: fix cache flush ordering for cpu hotplug
The L1 data cache flush needs to be after highbank_set_cpu_jump call which
pollutes the cache with the l2x0_lock. This causes other cores to deadlock
waiting for the l2x0_lock. Moving the flush of the entire data cache after
highbank_set_cpu_jump fixes the problem. Use flush_cache_louis instead of
flush_cache_all are that is sufficient to flush only the L1 data cache.
flush_cache_louis did not exist when highbank_cpu_die was originally
written.
With PL310 errata 769419 enabled, a wmb is inserted into idle which takes
the l2x0_lock. This makes the problem much more easily hit and causes
reset to hang.
Reported-by: Paolo Pisati <p.pisati@gmail.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
| -rw-r--r-- | arch/arm/mach-highbank/hotplug.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/arm/mach-highbank/hotplug.c b/arch/arm/mach-highbank/hotplug.c index f30c5284339..890cae23c12 100644 --- a/arch/arm/mach-highbank/hotplug.c +++ b/arch/arm/mach-highbank/hotplug.c @@ -28,13 +28,11 @@ extern void secondary_startup(void); */ void __ref highbank_cpu_die(unsigned int cpu) { - flush_cache_all(); - highbank_set_cpu_jump(cpu, phys_to_virt(0)); - highbank_set_core_pwr(); - cpu_do_idle(); + flush_cache_louis(); + highbank_set_core_pwr(); - /* We should never return from idle */ - panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu); + while (1) + cpu_do_idle(); } |