linux-kernel - Re: [PATCH 1/2][next] RDMA/hns: fix comparison of unsigned long variable 'end' with less than zero

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Message-ID: <20190607175749.GB25014@ziepe.ca>
Date:   Fri, 7 Jun 2019 14:57:49 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Colin King <colin.king@...onical.com>
Cc:     Lijun Ou <oulijun@...wei.com>, Wei Hu <xavier.huwei@...wei.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2][next] RDMA/hns: fix comparison of unsigned long
 variable 'end' with less than zero

On Fri, May 31, 2019 at 10:21:00AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the comparison of end with less than zero is always false
> because end is an unsigned long.  Also, replace checks of end with
> non-zero with end > 0 as it is possible that the #defined decrement
> may be changed in the future causing end to step over zero and go
> negative.
> 
> The initialization of end with 0 is also redundant as this value is
> never read and is later set to HW_SYNC_TIMEOUT_MSECS, so fix this by
> initializing it with this value to begin with.
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: 669cefb654cb ("RDMA/hns: Remove jiffies operation in disable interrupt context")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_hem.c   |  4 ++--
>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 12 ++++++------
>  2 files changed, 8 insertions(+), 8 deletions(-)

hns team: Can you please comment on this patch

Jason