linux-kernel - Re: [RFC PATCH 1/5] net: macb: Check MDIO state before read/write and use timeouts

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Date:   Thu, 3 May 2018 16:28:51 +0530
From:   Harini Katakam <harinik@...inx.com>
To:     Claudiu Beznea <Claudiu.Beznea@...rochip.com>
Cc:     Nicolas Ferre <nicolas.ferre@...el.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, michals@...inx.com,
        appanad@...inx.com,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Subject: Re: [RFC PATCH 1/5] net: macb: Check MDIO state before read/write and
 use timeouts

Hi Claudiu,

On Thu, May 3, 2018 at 3:38 PM, Claudiu Beznea
<Claudiu.Beznea@...rochip.com> wrote:
>
>
> On 22.03.2018 15:51, harinikatakamlinux@...il.com wrote:
>> From: Harini Katakam <harinik@...inx.com>
>>
<snip>
>> +     ulong timeout;
>> +
>> +     timeout = jiffies + msecs_to_jiffies(1000);
>> +     /* wait for end of transfer */
>> +     do {
>> +             if (MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
>> +                     break;
>> +
>> +             cpu_relax();
>> +     } while (!time_after_eq(jiffies, timeout));
>> +
>> +     if (time_after_eq(jiffies, timeout)) {
>> +             netdev_err(bp->dev, "wait for end of transfer timed out\n");
>> +             return -ETIMEDOUT;
>> +     }
>
> Wouldn't be cleaner to keep it in this way:
>
>         while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) {
>                 if (time_after_eq(jiffies, timeout) {
>                         netdev_err(bp->dev, "wait for end of transfer timed out\n");
>                         return -ETIMEDOUT;
>                 }
>                 cpu_relax();
>         }
>

Thanks for the review.
Sure, will update in next version.

Regards,
Harini