On 3/30/23 10:51, Takashi Iwai wrote:
> On Mon, 27 Mar 2023 13:29:19 +0200,
> Peter Ujfalusi wrote:
>>
>> int hda_bus_ml_get_capabilities(struct hdac_bus *bus)
>> {
>> - if (bus->mlcap)
>> - return snd_hdac_ext_bus_get_ml_capabilities(bus);
>> + u32 link_count;
>> + int ret;
>> + int i;
>> +
>> + if (!bus->mlcap)
>> + return 0;
>> +
>> + link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
>> +
>> + dev_dbg(bus->dev, "HDAudio Multi-Link count: %d\n", link_count);
>> +
>> + for (i = 0; i < link_count; i++) {
>> + ret = hda_ml_alloc_h2link(bus, i);
>> + if (ret < 0) {
>> + hda_bus_ml_free(bus);
>> + return ret;
>> + }
>> + }
>> return 0;
>
> This makes that each call of hda_bus_ml_get_capabilities() adds the
> h2link entries blindly. If the driver calls it multiple times
> mistakenly (the function name sounds as if it's just a helper to query
> the capability bits), it'll lead to doubly entries. Maybe adding some
> check would be safer, IMO.
Interesting comment, I didn't think of that one.
This function is currently called in the probe and indirectly via
hda_init_caps(). I think the driver framework guarantees the probe is
only called once, doesn't it?
we can also rename this function to make it clearer if there are any
suggestions, but the name is aligned with previous implementations of
the snd_hdac_ext stuff.
