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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-06-16 16:42:51 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-06-26 16:55:34 +1000 |
| commit | 6893ce6c1cdcf489b7ca8e6b6596208aa971a083 (patch) | |
| tree | 0f6b22ad7db5f55a435ccbda1989af24fda9300a /arch | |
| parent | c4007a2fbf5f82b7e694c22b5929c87e38415a56 (diff) | |
| download | linux-3.10-6893ce6c1cdcf489b7ca8e6b6596208aa971a083.tar.gz linux-3.10-6893ce6c1cdcf489b7ca8e6b6596208aa971a083.tar.bz2 linux-3.10-6893ce6c1cdcf489b7ca8e6b6596208aa971a083.zip | |
powerpc/pasemi: Use raw spinlock in SMP TB sync
spin_lock() can hang if called while the timebase is frozen,
so use a raw lock instead, also disable interrupts while
at it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/pasemi/setup.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c index 153051eb6d9..a4619347aa7 100644 --- a/arch/powerpc/platforms/pasemi/setup.c +++ b/arch/powerpc/platforms/pasemi/setup.c @@ -71,20 +71,25 @@ static void pas_restart(char *cmd) } #ifdef CONFIG_SMP -static DEFINE_SPINLOCK(timebase_lock); +static raw_spinlock_t timebase_lock; static unsigned long timebase; static void __devinit pas_give_timebase(void) { - spin_lock(&timebase_lock); + unsigned long flags; + + local_irq_save(flags); + hard_irq_disable(); + __raw_spin_lock(&timebase_lock); mtspr(SPRN_TBCTL, TBCTL_FREEZE); isync(); timebase = get_tb(); - spin_unlock(&timebase_lock); + __raw_spin_unlock(&timebase_lock); while (timebase) barrier(); mtspr(SPRN_TBCTL, TBCTL_RESTART); + local_irq_restore(flags); } static void __devinit pas_take_timebase(void) @@ -92,10 +97,10 @@ static void __devinit pas_take_timebase(void) while (!timebase) smp_rmb(); - spin_lock(&timebase_lock); + __raw_spin_lock(&timebase_lock); set_tb(timebase >> 32, timebase & 0xffffffff); timebase = 0; - spin_unlock(&timebase_lock); + __raw_spin_unlock(&timebase_lock); } struct smp_ops_t pas_smp_ops = { |