Re: [PATCH] i2c: virtio: Add support for zero-length requests

[Viresh Kumar]

On 21-10-21, 15:17, Viresh Kumar wrote:
> The virtio specification received a new mandatory feature
> (VIRTIO_I2C_F_ZERO_LENGTH_REQUEST) for zero length requests. Fail if the
> feature isn't offered by the device.
> 
> For each read-request, set the VIRTIO_I2C_FLAGS_M_RD flag, as required
> by the VIRTIO_I2C_F_ZERO_LENGTH_REQUEST feature.
> 
> This allows us to support zero length requests, like SMBUS Quick, where
> the buffer need not be sent anymore.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> ---
> Hi Wolfram,
> 
> Please do not apply this until the spec changes [1] are merged, sending it early
> to get review done. I will ping you later once the spec is merged.
> 
> [1] https://lists.oasis-open.org/archives/virtio-dev/202110/msg00109.html

Michael,

Can this be merged as well based on the current voting at the ballot ?

https://www.oasis-open.org/committees/ballot.php?id=3659

Wolfram,

I am asking as this patch should be considered as a fix, which needs to be
applied to the 5.15 kernel itself if possible (now or via stable), as we are
implementing a new mandatory feature, which will make the currently merged
version of the driver unusable going forward (since this won't be backwards
compatible).

-- 
viresh