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authorJohn W. Linville <linville@tuxdriver.com>2010-03-16 15:40:59 -0400
committerJohn W. Linville <linville@tuxdriver.com>2010-03-30 15:37:20 -0400
commit368d06f5b0eefcbf37d677d3b65381310a251f03 (patch)
treee8e05e1e6a34583f31203c29c03dcf9f6c036aeb /net/wireless
parentc8406ea8fa1adde8dc5400127281d497bbcdb84a (diff)
wireless: convert reg_regdb_search_lock to mutex
Stanse discovered that kmalloc is being called with GFP_KERNEL while holding this spinlock. The spinlock can be a mutex instead, which also enables the removal of the unlock/lock around the lock/unlock of cfg80211_mutex and the call to set_regdom. Reported-by: Jiri Slaby <jirislaby@gmail.com> Cc: stable@kernel.org Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/reg.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index ed89c59bb43..81fcafc6015 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -324,7 +324,7 @@ struct reg_regdb_search_request {
};
static LIST_HEAD(reg_regdb_search_list);
-static DEFINE_SPINLOCK(reg_regdb_search_lock);
+static DEFINE_MUTEX(reg_regdb_search_mutex);
static void reg_regdb_search(struct work_struct *work)
{
@@ -332,7 +332,7 @@ static void reg_regdb_search(struct work_struct *work)
const struct ieee80211_regdomain *curdom, *regdom;
int i, r;
- spin_lock(&reg_regdb_search_lock);
+ mutex_lock(&reg_regdb_search_mutex);
while (!list_empty(&reg_regdb_search_list)) {
request = list_first_entry(&reg_regdb_search_list,
struct reg_regdb_search_request,
@@ -346,18 +346,16 @@ static void reg_regdb_search(struct work_struct *work)
r = reg_copy_regd(&regdom, curdom);
if (r)
break;
- spin_unlock(&reg_regdb_search_lock);
mutex_lock(&cfg80211_mutex);
set_regdom(regdom);
mutex_unlock(&cfg80211_mutex);
- spin_lock(&reg_regdb_search_lock);
break;
}
}
kfree(request);
}
- spin_unlock(&reg_regdb_search_lock);
+ mutex_unlock(&reg_regdb_search_mutex);
}
static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
@@ -375,9 +373,9 @@ static void reg_regdb_query(const char *alpha2)
memcpy(request->alpha2, alpha2, 2);
- spin_lock(&reg_regdb_search_lock);
+ mutex_lock(&reg_regdb_search_mutex);
list_add_tail(&request->list, &reg_regdb_search_list);
- spin_unlock(&reg_regdb_search_lock);
+ mutex_unlock(&reg_regdb_search_mutex);
schedule_work(&reg_regdb_work);
}