linux-kernel - Re: [PATCH v2][net-next] soc: fsl: dpio: Unsigned compared against 0 in qbman_swp_set_irq

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Date:   Wed, 20 Oct 2021 13:30:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Tim Gardner <tim.gardner@...onical.com>
Cc:     netdev@...r.kernel.org, ioana.ciornei@....com, Roy.Pledge@....com,
        leoyang.li@....com, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2][net-next] soc: fsl: dpio: Unsigned compared against 0 in
 qbman_swp_set_irq_coalescing()

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@...emloft.net>:

On Tue, 19 Oct 2021 06:19:25 -0600 you wrote:
> Coverity complains of unsigned compare against 0. There are 2 cases in
> this function:
> 
> 1821        itp = (irq_holdoff * 1000) / p->desc->qman_256_cycles_per_ns;
> 
> CID 121131 (#1 of 1): Unsigned compared against 0 (NO_EFFECT)
> unsigned_compare: This less-than-zero comparison of an unsigned value is never true. itp < 0U.
> 1822        if (itp < 0 || itp > 4096) {
> 1823                max_holdoff = (p->desc->qman_256_cycles_per_ns * 4096) / 1000;
> 1824                pr_err("irq_holdoff must be between 0..%dus\n", max_holdoff);
> 1825                return -EINVAL;
> 1826        }
> 1827
>     	unsigned_compare: This less-than-zero comparison of an unsigned value is never true. irq_threshold < 0U.
> 1828        if (irq_threshold >= p->dqrr.dqrr_size || irq_threshold < 0) {
> 1829                pr_err("irq_threshold must be between 0..%d\n",
> 1830                       p->dqrr.dqrr_size - 1);
> 1831                return -EINVAL;
> 1832        }
> 
> [...]

Here is the summary with links:
  - [v2,net-next] soc: fsl: dpio: Unsigned compared against 0 in qbman_swp_set_irq_coalescing()
    https://git.kernel.org/netdev/net-next/c/818a76a55d6e

You are awesome, thank you!
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