[Xen-devel] [PATCH 4/5] pvcalls-front: don't return error when the ring is full

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

When the ring is full, size == array_size. It is not an error condition,
so simply return 0 instead of an error.

Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
---
 drivers/xen/pvcalls-front.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 0158858..1a893a1 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -475,8 +475,10 @@ static int __write_ring(struct pvcalls_data_intf *intf,
        virt_mb();
 
        size = pvcalls_queued(prod, cons, array_size);
-       if (size >= array_size)
+       if (size > array_size)
                return -EINVAL;
+       if (size == array_size)
+               return 0;
        if (len > array_size - size)
                len = array_size - size;
 
-- 
1.9.1


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