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    Subject[PATCH 4.19 114/140] pvcalls-front: dont return error when the ring is full
    Date
    From: Stefano Stabellini <sstabellini@kernel.org>

    [ Upstream commit d90a1ca60a1eccb4383fe203c76223ab4c0799ed ]

    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>
    ---
    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 3a144eecb6a72..d7438fdc57061 100644
    --- a/drivers/xen/pvcalls-front.c
    +++ b/drivers/xen/pvcalls-front.c
    @@ -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;

    --
    2.20.1


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