mac80211: handle failed scan requests in STA mode

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If cfg80211 requests a scan it awaits either a return code != 0 from
the scan function or the cfg80211_scan_done to be called. In case of
a STA mac80211's scan function ever returns 0 and queues the scan request.
If ieee80211_sta_work is executed and ieee80211_start_scan fails for
some reason cfg80211_scan_done will never be called but cfg80211 still
thinks the scan was triggered successfully and will refuse any future
scan requests due to drv->scan_req not being cleaned up.

If a scan is triggered from within the MLME a similar problem appears. If
ieee80211_start_scan returns an error, local->scan_req will not be reset
and mac80211 will refuse any future scan requests.

Hence, in both cases call ieee80211_scan_failed (which notifies cfg80211
and resets local->scan_req) if ieee80211_start_scan returns an error.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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This commit is contained in:

Helmut Schaa 2009-03-09 15:47:08 +01:00 • committed by John W. Linville

parent 8830cb678b

commit af88b9078d

3 changed files with 25 additions and 2 deletions

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1

net/mac80211/ieee80211_i.h

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14

net/mac80211/mlme.c

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12

net/mac80211/scan.c

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