Re: [PATCH v3 02/14] thermal: core: Rearrange checks in thermal_bind_cdev_to_trip()

[Daniel Lezcano]

On 21/08/2024 10:49, lihuisong (C) wrote:

[ ... ]

> > -    list_for_each_entry(pos2, &thermal_cdev_list, node) {
> > -        if (pos2 == cdev)
> > -            break;
> > -    }
> > +    lockdep_assert_held(&thermal_list_lock);
> > -    if (tz != pos1 || cdev != pos2)
> > +    if (list_empty(&tz->node) || list_empty(&cdev->node))
> The old verification is ensure that tz and cdev already add to 
> thermal_tz_list and thermal_cdev_list，respectively.
> Namely, tz and cdev are definitely registered and intialized.
> The check is ok for all untizalized thermal_zone_device and cooling device.
> But the new verification doesn't seem to do that.

If the tz or the cdev are registered then their "->node" is not empty 
because they are linked with the thermal_list and cdev_list

So either way is browsing the lists to find the tz/cdev or just check 
"->node" is not empty. The latter the faster.

Did I misunderstood your comment ?

[ ... ]

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