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authorJohannes Berg <johannes@sipsolutions.net>2009-08-21 12:23:49 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-08-28 14:40:30 -0400
commitf7969969f416e593bcc7dc24abf3f9fd6c27136d (patch)
tree4f4e2ef49d2afae82442ba273d7490938232f113 /net/wireless/core.h
parent3d832611d794b3d312d26a4b251ac5285206f90d (diff)
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cfg80211: make spurious warnings less likely, configurable
Bob reported that he got warnings in IBSS mode about the ssid_len being zero on a joined event, but only when kmemcheck was enabled. This appears to be due to a race condition between drivers and userspace, when the driver reports joined but the user in the meantime decided to leave the IBSS again, the warning would trigger. This was made more likely by kmemcheck delaying the code that does the check and sends the event. So first, make the warning trigger closer to the driver, which means it's not locked, but since only the warning depends on it that's ok. And secondly, users will not want to have spurious warnings at all, so make those that are known to be racy in such a way configurable. Reported-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/core.h')
-rw-r--r--net/wireless/core.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 68eaf34..d262d42 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -380,4 +380,15 @@ int rdev_set_freq(struct cfg80211_registered_device *rdev,
struct wireless_dev *for_wdev,
int freq, enum nl80211_channel_type channel_type);
+#ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
+#define CFG80211_DEV_WARN_ON(cond) WARN_ON(cond)
+#else
+/*
+ * Trick to enable using it as a condition,
+ * and also not give a warning when it's
+ * not used that way.
+ */
+#define CFG80211_DEV_WARN_ON(cond) ({bool __r = (cond); __r; })
+#endif
+
#endif /* __NET_WIRELESS_CORE_H */