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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>
This commit is contained in:
John W. Linville 2010-03-16 15:40:59 -04:00
parent c8406ea8fa
commit 368d06f5b0
1 changed files with 5 additions and 7 deletions
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12
net/wireless/reg.c
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@ -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);
}