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SubjectRe: [PATCH 02/24] thunderbolt: Do not try to read UID if DROM offset is read as 0
On Mon, May 22, 2017 at 08:41:22PM +0200, Andreas Noever wrote:
> Yes there is a check for the root switch, but also one that checks the
> return code of tb_drom_read_uid_only :)
>
> err = tb_drom_read_uid_only(sw, &uid);
> if (err) {
> tb_sw_warn(sw, "uid read failed\n");
> return err;
> }
> if (sw != sw->tb->root_switch && sw->uid != uid) {
>
>
> The reason it works on the Mac is because drom_offset is not 0, so the
> new branch in tb_drom_read_uid_only is not taken. Probably this is the
> case for all Cactus Ridge models and Alpine Ridge doesn't go there
> since it uses the ICM?

Yes in case of ICM we don't call the function at all.

> Still it wouldn't hurt to only read the uid if
> sw != root_switch, the value is not used if sw == root_switch.

I agree. I'll update the code so that it will only read and check UID
when we are not dealing with the root switch.

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