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cfg80211: add channel checking for iface combinations

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.connect cannot be handled since the driver scans
and connects on its own. It is up to the driver
then to refuse a connection (with -EBUSY for
example).

Non-fixed channel IBSSes always take a single
channel resource. For example two non-fixed
channel IBSSes always take up 2
num_different_channels, even if they operate on
the same channel at a given point of time.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior 2012-06-29 12:47:07 +02:00 • committed by Johannes Berg
parent 2e165b8184
commit d4e50c5917
3 changed files with 88 additions and 8 deletions
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8
net/wireless/core.c
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@ -373,6 +373,14 @@ static int wiphy_verify_combinations(struct wiphy *wiphy)
if (WARN_ON(!c->num_different_channels))
return -EINVAL;
/*
* Put a sane limit on maximum number of different
* channels to simplify channel accounting code.
*/
if (WARN_ON(c->num_different_channels >
CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
return -EINVAL;
if (WARN_ON(!c->n_limits))
return -EINVAL;