On Tue, Jan 31, 2012 at 7:43 AM, Johannes Berg
[off-list ref] wrote:

On 1/26/2012 4:37 AM, Victor Goldenshtein wrote:

quoted

The dfs master device should monitor radar channels
for potential radar interference for a minimum of
CAC (channel availability check) time, during this
period no tx can occur. If no radar interference
is detected the dfs master may initiate the tx with
new NL80211_CMD_DFS_ENABLE_TX command.

So do we think that no safeguards here at all are acceptable? Not even
checking that radar detection was enabled, CAC time expired, etc.?

We can add a check whether dfs is supported by the driver
(rdev->wiphy.features & NL80211_FEATURE_DFS).

The nl/cfg/mac doesn't have the info whether the radar detection is
enabled and definitely doesn't heard about CAC time, on other hand the
driver which starts/handles radar detection know whether it started or
not. I think the driver should perform this simple "sanity" checks,
otherwise we"ll need to save different DFS states in the mac, not sure
that this is what we want.



-- 
Thanks,
Victor.