netdev - Re: [PATCH RFC 3/6] net: phy: Threaded interrupts allow some simplification

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Message-ID: <a3e6b467-9e44-1ed5-65ce-63c839dd3365@cogentembedded.com>
Date:   Tue, 18 Oct 2016 13:37:11 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC 3/6] net: phy: Threaded interrupts allow some
 simplification

Hello!

On 9/28/2016 8:14 PM, Florian Fainelli wrote:

>>>>>> The PHY interrupts are now handled in a threaded interrupt handler,
>>>>>> which can sleep. The work queue is no longer needed, phy_change() can
>>>>>> be called directly. Additionally, none of the callers of
>>>>>> phy_mac_interrupt() did so in interrupt context, so fully remove the
>>>>>
>>>>>   I did intend to call it from interrupt context (from the ravb
>>>>> driver).
>>>>>
>>>>>> work queue, and document that phy_mac_interrupt() should not be called
>>>>>> in interrupt context.
>>>>>
>>>>>   It was intentionally made callable from the interrupt context, I'd
>>>>> prefer
>>>>> if you wouldn't change that.
>>>>
>>>>    OTOH, it's still not very handy to call because of the 'new_link'
>>>> parameter which I'm not sure I can provide...
>>>
>>> Hi Sergei
>>>
>>> If there is a need for it, i will leave the work queue and keep this
>>> code unchanged.
>>
>>    Let's hear what Florian says...
>
> The intent is really to have phy_mac_interrupt() callable from hard IRQ
> context, not that this matters really too much because link events
> already occur in the slow path, but it's nice to have that property
> retained IMHO.

    Actually, I still don't know how to call phy_mac_interrupt() from the ravb 
driver because of the 'new_link' parameter -- I won't always have that signal 
connected to the MAC...

MBR, Sergei