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authorEmmanuel Grumbach <emmanuel.grumbach@intel.com>2012-04-30 10:23:36 +0300
committerJohn W. Linville <linville@tuxdriver.com>2012-05-08 21:53:56 -0400
commitef9456a85dabe2222a4cb80fe8eef6361170c55d (patch)
treeee63bb53677f27f2de3db2c6801b78d5a8ce2a27 /net/wireless/scan.c
parentba89bf1961bb991a5c6415bd8408a8cb61ee46dc (diff)
cfg80211: fix BSS comparison
Since the BSS table is organized in a RB tree, the BSSs need to be comparable. This means that we must define a < and > operator to the BSS object. compare_ethr_addr isn't enough since it returns only a binary value. Since Felix's cfg80211: use compare_ether_addr on MAC addresses instead of memcmp Because of the constant size and guaranteed 16 bit alignment, the inline compare_ether_addr function is much cheaper than calling memcmp. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com> The BSS table is corrupted: rb_find_bss can't find the bss. As a result BSSes are duplicated in the BSS table, and we get stuck while probing an AP before associating (in STA mode). Change-Id: I85928756f4328028230832c1565ece7f412f3843 CC: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Acked-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/scan.c')
-rw-r--r--net/wireless/scan.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 1442bb68a3f3..9dee87c0358c 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -378,7 +378,11 @@ static int cmp_bss_core(struct cfg80211_bss *a,
b->len_information_elements);
}
- return compare_ether_addr(a->bssid, b->bssid);
+ /*
+ * we can't use compare_ether_addr here since we need a < > operator.
+ * The binary return value of compare_ether_addr isn't enough
+ */
+ return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
}
static int cmp_bss(struct cfg80211_bss *a,