diff options
| -rw-r--r-- | drivers/clk/clk.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 647d056..b221d80 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -141,10 +141,18 @@ static unsigned long clk_enable_lock(void) { unsigned long flags; - if (!spin_trylock_irqsave(&enable_lock, flags)) { + /* + * On UP systems, spin_trylock_irqsave() always returns true, even if + * we already hold the lock. So, in that case, we rely only on + * reference counting. + */ + if (!IS_ENABLED(CONFIG_SMP) || + !spin_trylock_irqsave(&enable_lock, flags)) { if (enable_owner == current) { enable_refcnt++; __acquire(enable_lock); + if (!IS_ENABLED(CONFIG_SMP)) + local_save_flags(flags); return flags; } spin_lock_irqsave(&enable_lock, flags); |
