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cfg80211: fix race between core hint and driver's custom apply

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Its possible for cfg80211 to have scheduled the work and for
the global workqueue to not have kicked in prior to a cfg80211
driver's regulatory hint or wiphy_apply_custom_regulatory().

Although this is very unlikely its possible and should fix
this race. When this race would happen you are expected to have
hit a null pointer dereference panic.

Cc: stable@kernel.org
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-05-13 17:04:42 -04:00 committed by John W. Linville
parent 267d493b32
commit 5078b2e32a
1 changed files with 7 additions and 0 deletions
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7
net/wireless/reg.c
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@ -1551,6 +1551,13 @@ static int regulatory_hint_core(const char *alpha2)
queue_regulatory_request(request);
/*
* This ensures last_request is populated once modules
* come swinging in and calling regulatory hints and
* wiphy_apply_custom_regulatory().
*/
flush_scheduled_work();
return 0;
}