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    Subject[PATCH 4.15 104/163] mlx5: fix mlx5_get_vector_affinity to start from completion vector 0
    Date
    4.15-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Sagi Grimberg <sagi@grimberg.me>

    commit 2572cf57d75a7f91835d9a38771e9e76d575d122 upstream.

    The consumers of this routine expects the affinity map of of vector
    index relative to the first completion vector. The upper layers are
    not aware of internal/private completion vectors that mlx5 allocates
    for its own usage.

    Hence, return the affinity map of vector index relative to the first
    completion vector.

    Fixes: 05e0cc84e00c ("net/mlx5: Fix get vector affinity helper function")
    Reported-by: Logan Gunthorpe <logang@deltatee.com>
    Tested-by: Max Gurtovoy <maxg@mellanox.com>
    Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
    Cc: <stable@vger.kernel.org> # v4.15
    Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
    Signed-off-by: Doug Ledford <dledford@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/mlx5/driver.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/include/linux/mlx5/driver.h
    +++ b/include/linux/mlx5/driver.h
    @@ -1238,7 +1238,7 @@ mlx5_get_vector_affinity(struct mlx5_cor
    int eqn;
    int err;

    - err = mlx5_vector2eqn(dev, vector, &eqn, &irq);
    + err = mlx5_vector2eqn(dev, MLX5_EQ_VEC_COMP_BASE + vector, &eqn, &irq);
    if (err)
    return NULL;


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