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cfg80211: Properly track transmitting and non-transmitting BSS

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When holding data of the non-transmitting BSS, we need to keep the
transmitting BSS data on. Otherwise it will be released, and release
the non-transmitting BSS with it.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Sara Sharon
2019-01-21 12:22:21 +02:00
committed by Johannes Berg
parent 1c8745f3ec
commit a3584f56de
2 changed files with 46 additions and 2 deletions
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12
net/wireless/core.h
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@@ -153,6 +153,7 @@ struct cfg80211_internal_bss {
struct list_head list;
struct list_head hidden_list;
struct list_head nontrans_list;
struct cfg80211_bss *transmitted_bss;
struct rb_node rbn;
u64 ts_boottime;
unsigned long ts;
@@ -183,12 +184,23 @@ static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pu
static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
{
atomic_inc(&bss->hold);
if (bss->transmitted_bss) {
bss = container_of(bss->transmitted_bss,
struct cfg80211_internal_bss, pub);
atomic_inc(&bss->hold);
}
}
static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
{
int r = atomic_dec_return(&bss->hold);
WARN_ON(r < 0);
if (bss->transmitted_bss) {
bss = container_of(bss->transmitted_bss,
struct cfg80211_internal_bss, pub);
r = atomic_dec_return(&bss->hold);
WARN_ON(r < 0);
}
}