Re: [PATCH] iwch_create_cq off by one error

[Steve Wise <swise@opengridcomputing.com>]

Acked-by: Steve Wise <swise@opengridcomputing.com>


Jon Mason wrote:
> The cxbg3 driver is unnecessarily decreasing the number of cq entries
> by one when creating a cq.  This will cause an error of not having as
> many cqs as requested by the user, if the user requests a power of 2
> cq length.
> 
> Thanks,
> Jon
> 
> Signed-off-by: Jon Mason <jon@opengridcomputing.com>
> ---
>  drivers/infiniband/hw/cxgb3/iwch_provider.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
> index f0c7775..800ef6d 100644
> --- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
> +++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
> @@ -188,7 +188,7 @@ static struct ib_cq *iwch_create_cq(struct ib_device *ibdev, int entries, int ve
>  		return ERR_PTR(-ENOMEM);
>  	}
>  	chp->rhp = rhp;
> -	chp->ibcq.cqe = (1 << chp->cq.size_log2) - 1;
> +	chp->ibcq.cqe = 1 << chp->cq.size_log2;
>  	spin_lock_init(&chp->lock);
>  	atomic_set(&chp->refcnt, 1);
>  	init_waitqueue_head(&chp->wait);