Re: [PATCH v2 1/2] scsi: core: cleanup scsi_dev_queue_ready()

[Wenchao Hao]

On 2023/10/18 5:15, Bart Van Assche wrote:
> On 10/15/23 19:08, Wenchao Hao wrote:
> > +    /*
> > +     * device_blocked is not set at mostly time, so check it first
> > +     * and return token when it is not set.
> > +     */
> > +    if (!atomic_read(&sdev->device_blocked))
> > +        return token;
>
> This patch looks like an improvement to me. But I don't think that the
> above comment is useful. I propose to move it into the patch
> description.
>
> > -        /*
> > -         * unblock after device_blocked iterates to zero
> > -         */
> > -        if (atomic_dec_return(&sdev->device_blocked) > 0)
> > -            goto out_dec;
> > -        SCSI_LOG_MLQUEUE(3, sdev_printk(KERN_INFO, sdev,
> > -                   "unblocking device at zero depth\n"));
> > +    /*
> > +     * unblock after device_blocked iterates to zero
> > +     */
>  > +    if (scsi_device_busy(sdev) > 1 ||
>  > +        atomic_dec_return(&sdev->device_blocked) > 0) {
>  > +        sbitmap_put(&sdev->budget_map, token);
>  > +        return -1;
>  >       }
>
> Please make the above comment match the new code, e.g. by changing it
> into the following: "Only unblock if no other commands are pending and
> if device_blocked has decreased to zero".

OK, would update.

Thanks.

> Thanks,
>
> Bart.