[dpdk-dev] [PATCH 2/4] net/bnx2x: remove unmeetable comparison

[De Lara Guarch, Pablo]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Andy Green
> Sent: Friday, May 11, 2018 2:51 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [PATCH 2/4] net/bnx2x: remove unmeetable comparison
> 
> /home/agreen/projects/dpdk/drivers/net/bnx2x/elink.c:
> In function ‘elink_check_kr2_wa’:
> /home/agreen/projects/dpdk/drivers/net/bnx2x/elink.c:12922:28:
> error: bitwise comparison always evaluates to false [-Werror=tautological-
> compare]
>         ((next_page & 0xe0) == 0x2))));
> ---
>  drivers/net/bnx2x/elink.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/bnx2x/elink.c b/drivers/net/bnx2x/elink.c index
> 99684a5f9..2aef2b6da 100644
> --- a/drivers/net/bnx2x/elink.c
> +++ b/drivers/net/bnx2x/elink.c
> @@ -12919,9 +12919,7 @@ static void elink_check_kr2_wa(struct elink_params
> *params,
>  	 * but only KX is advertised, declare this link partner as non-KR2
>  	 * device.
>  	 */
> -	not_kr2_device = (((base_page & 0x8000) == 0) ||
> -			  (((base_page & 0x8000) &&
> -			    ((next_page & 0xe0) == 0x2))));
> +	not_kr2_device = !(base_page & 0x8000);
> 
>  	/* In case KR2 is already disabled, check if we need to re-enable it */
>  	if (!(vars->link_attr_sync & LINK_ATTR_SYNC_KR2_ENABLE)) {

Looks like a good fix, but I wonder what's the actual intention of that conditional.
CC'ing the maintainers and Stephen Hemminger (the author of this code) to figure it out.

Apart from that, missing signed-off-by, fixes line and Cc stable:

Fixes: b5bf7719221d ("bnx2x: driver support routines")
Cc: stable at dpdk.org