drm/radeon: fix & improve ih ring handling v3
The spinlock was actually there to protect the
rptr, but rptr was read outside of the locked area.
Also we don't really need a spinlock here, an
atomic should to quite fine since we only need to
prevent it from being reentrant.
v2: Keep the spinlock....
v3: Back to an atomic again after finding & fixing the real bug.
Signed-off-by: Christian Koenig <christian.koenig@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 9d6c1de..5ddf895 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -738,11 +738,10 @@
struct radeon_bo *ring_obj;
volatile uint32_t *ring;
unsigned rptr;
- unsigned wptr;
unsigned ring_size;
uint64_t gpu_addr;
uint32_t ptr_mask;
- spinlock_t lock;
+ atomic_t lock;
bool enabled;
};