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SubjectRe: [PATCH v12] i2c: virtio: add a virtio i2c frontend driver
On 02-07-21, 12:58, Andy Shevchenko wrote:
> On Fri, Jul 02, 2021 at 04:46:47PM +0800, Jie Deng wrote:
> > +static int virtio_i2c_complete_reqs(struct virtqueue *vq,
> > + struct virtio_i2c_req *reqs,
> > + struct i2c_msg *msgs, int nr,
> > + bool fail)
> > +{
> > + struct virtio_i2c_req *req;
> > + bool failed = fail;

Jie, you can actually get rid of this variable too. Jut rename fail to failed
and everything shall work as you want.

> > + unsigned int len;
> > + int i, j = 0;
> > +
> > + for (i = 0; i < nr; i++) {
> > + /* Detach the ith request from the vq */
> > + req = virtqueue_get_buf(vq, &len);
> > +
> > + /*
> > + * Condition (req && req == &reqs[i]) should always meet since
> > + * we have total nr requests in the vq.
> > + */
> > + if (!failed && (WARN_ON(!(req && req == &reqs[i])) ||
> > + (req->in_hdr.status != VIRTIO_I2C_MSG_OK)))
> > + failed = true;
>
> ...and after failed is true, we are continuing the loop, why?

Actually this function can be called with fail set to true. We proceed as we
need to call i2c_put_dma_safe_msg_buf() for all buffers we allocated earlier.

> > + i2c_put_dma_safe_msg_buf(reqs[i].buf, &msgs[i], !failed);
> > + if (!failed)
>
> > + ++j;
>
> Besides better to read j++ the j itself can be renamed to something more
> verbose.
>
> > + }
>
> > + return (fail ? -ETIMEDOUT : j);
>
> Redundant parentheses.
>
> > +}

--
viresh

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