linux-kernel - Re: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver

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Message-ID: <YDzZHKdrpROgSdg3@smile.fi.intel.com>
Date:   Mon, 1 Mar 2021 14:07:56 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Jie Deng <jie.deng@...el.com>
Cc:     linux-i2c@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, wsa@...nel.org,
        jasowang@...hat.com, wsa+renesas@...g-engineering.com,
        conghui.chen@...el.com, arnd@...db.de, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com, Sergey.Semin@...kalelectronics.ru,
        rppt@...nel.org, loic.poulain@...aro.org, tali.perry1@...il.com,
        u.kleine-koenig@...gutronix.de, bjorn.andersson@...aro.org,
        yu1.wang@...el.com, shuo.a.liu@...el.com, viresh.kumar@...aro.org
Subject: Re: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver

On Mon, Mar 01, 2021 at 02:41:35PM +0800, Jie Deng wrote:
> Add an I2C bus driver for virtio para-virtualization.
> 
> The controller can be emulated by the backend driver in
> any device model software by following the virtio protocol.
> 
> The device specification can be found on
> https://lists.oasis-open.org/archives/virtio-comment/202101/msg00008.html.
> 
> By following the specification, people may implement different
> backend drivers to emulate different controllers according to
> their needs.

...

> +		buf = kzalloc(msgs[i].len, GFP_KERNEL);
> +		if (!buf)
> +			break;
> +
> +		if (msgs[i].flags & I2C_M_RD) {

kzalloc()

> +			reqs[i].read_buf = buf;
> +			sg_init_one(&msg_buf, reqs[i].read_buf, msgs[i].len);
> +			sgs[outcnt + incnt++] = &msg_buf;
> +		} else {
> +			reqs[i].write_buf = buf;

> +			memcpy(reqs[i].write_buf, msgs[i].buf, msgs[i].len);

kmemdup() ?

> +			sg_init_one(&msg_buf, reqs[i].write_buf, msgs[i].len);
> +			sgs[outcnt++] = &msg_buf;
> +		}

...

> +
> +

One blank line is enough.

...


> +	ret = virtio_i2c_send_reqs(vq, reqs, msgs, num);
> +	if (ret == 0)
> +		goto err_unlock_free;

> +	else

Redundant.

> +		nr = ret;

-- 
With Best Regards,
Andy Shevchenko