Re: [PATCH 08/10] drm/radeon: replace pflip and sw_int counters with atomics

On Fre, 2012-06-01 at 08:19 +0200, Michel Dänzer wrote:

I think this might introduce a race condition:

Thread 0 Thread 1

---

atomic_inc_return() returns 1 spin_lock_irqsave() atomic_dec_and_test() radeon_irq_set()

=> the interrupt won't be enabled.

Hrmm, I messed up the formatting there, let me try one more time:

Thread 0 Thread 1 -------- -------- atomic_inc_return() returns 1 spin_lock_irqsave() atomic_dec_and_test() radeon_irq_set()