linux-kernel - Re: [PATCH 1/2] i2c: virtio: disable timeout handling

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Date:   Wed, 20 Oct 2021 14:35:49 +0800
From:   Jie Deng <jie.deng@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Wolfram Sang <wsa@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        virtualization@...ts.linux-foundation.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...s.com
Subject: Re: [PATCH 1/2] i2c: virtio: disable timeout handling

On 2021/10/20 13:36, Greg KH wrote:

> On Wed, Oct 20, 2021 at 12:20:13PM +0800, Jie Deng wrote:
>> On 2021/10/20 2:14, Wolfram Sang wrote:
>>>> I think it is set to HZ currently, though I haven't tried big
>>>> transfers but I still get into some issues with Qemu based stuff.
>>>> Maybe we can bump it up to few seconds :)
>>> If you use adapter->timeout, this can even be set at runtime using a
>>> ioctl. So, it can adapt to use cases. Of course, the driver should
>>> initialize it to a sane default if the automatic default (HZ) is not
>>> suitable.
>>
>> I think a big value may solve most cases. but the driver never know how big
>> is enough by static configuration.
>>
>> Can we make this value to be configurable, just let the other side provide
>> this value ?
> If an ioctl can change it, that would mean it is configurable, right?


Yes, but we need to know what's the best value to be configured for a 
specific "other side".

I think the "other side" should be more aware of what value is 
reasonable to be used.