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pvcalls-front: don't return error when the ring is full

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[ Upstream commit d90a1ca60a ]

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@xilinx.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefano Stabellini 2018-12-21 15:06:32 -08:00 committed by Greg Kroah-Hartman
parent 1fb5942891
commit 36a2e9bf24
1 changed files with 3 additions and 1 deletions
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4
drivers/xen/pvcalls-front.c
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@ -504,8 +504,10 @@ 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;