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Re: [PATCH v2 01/13] cfg80211: allow drivers to iterate over matching combinations

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On Fri, 2014-03-28 at 14:42 +0100, Michal Kazior wrote:
> On 28 March 2014 14:22, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
> > On Fri, 2014-03-28 at 14:21 +0100, Michal Kazior wrote:
> >
> >> >> +int cfg80211_iter_combinations(struct wiphy *wiphy,
> >> >> +                            const int num_different_channels,
> >> >> +                            const u8 radar_detect,
> >> >> +                            const int iftype_num[NUM_NL80211_IFTYPES],
> >> >> +                            void (*iter)(const struct ieee80211_iface_combination *c,
> >> >> +                                         void *data),
> >> >> +                            void *data);
> >> >
> >> > Maybe *iter should have a non-void return value and allow aborting the
> >> > loop somehow?
> >>
> >> I don't see much of use for that. You can still use *data for that.
> >
> > No, I meant to abort the iteration loop, say when the function returns
> > true (or false, whichever way you want to look at it). That way you can
> > stop iteration at the first combination that's sufficient.
> 
> I know. It's just that it bothers me - if you use true/false you end
> up with "do I use true for continue or break" (and need to put
> comments in the code) and having an enum for such a trivial thing
> seems silly too. On the other hand using *data to guard *iter is also
> silly.

Ok, let's leave it. It's not like we have a million combinations and
iterating them is expensive ...

johannes

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