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-rw-r--r--arch/sparc/include/asm/vio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/vio.h b/arch/sparc/include/asm/vio.h
index a8210c5e5932..55841c184e6d 100644
--- a/arch/sparc/include/asm/vio.h
+++ b/arch/sparc/include/asm/vio.h
@@ -265,7 +265,7 @@ static inline u32 vio_dring_avail(struct vio_dring_state *dr,
unsigned int ring_size)
{
return (dr->pending -
- ((dr->prod - dr->cons) & (ring_size - 1)));
+ ((dr->prod - dr->cons) & (ring_size - 1)) - 1);
}
#define VIO_MAX_TYPE_LEN 32