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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2008-08-26 11:57:59 -0300
committerJohn W. Linville <linville@tuxdriver.com>2008-08-29 16:24:10 -0400
commitf745ba03a12a1c4b98a88a96ab39d9b58ac677a2 (patch)
treeb66455f17ac6c8cfc33711c71da793ae17209ada /net
parent01b510b9c29caf2134c31d2bc8c2c5cc73987eb6 (diff)
rfkill: add WARN and BUG_ON paranoia (v2)
BUG_ON() and WARN() the heck out of buggy drivers calling into the rfkill subsystem. Also switch from WARN_ON(1) to the new descriptive WARN(). Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Cc: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/rfkill/rfkill.c50
1 files changed, 37 insertions, 13 deletions
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index b630f358d67..910699c4e04 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -76,6 +76,7 @@ static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
*/
int register_rfkill_notifier(struct notifier_block *nb)
{
+ BUG_ON(!nb);
return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(register_rfkill_notifier);
@@ -91,6 +92,7 @@ EXPORT_SYMBOL_GPL(register_rfkill_notifier);
*/
int unregister_rfkill_notifier(struct notifier_block *nb)
{
+ BUG_ON(!nb);
return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
@@ -202,6 +204,9 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
* RFKILL_STATE_HARD_BLOCKED */
break;
default:
+ WARN(1, KERN_WARNING
+ "rfkill: illegal state %d passed as parameter "
+ "to rfkill_toggle_radio\n", state);
return -EINVAL;
}
@@ -236,7 +241,11 @@ static void __rfkill_switch_all(const enum rfkill_type type,
{
struct rfkill *rfkill;
- if (unlikely(state >= RFKILL_STATE_MAX))
+ if (WARN((state >= RFKILL_STATE_MAX || type >= RFKILL_TYPE_MAX),
+ KERN_WARNING
+ "rfkill: illegal state %d or type %d "
+ "passed as parameter to __rfkill_switch_all\n",
+ state, type))
return;
rfkill_global_states[type].current_state = state;
@@ -334,7 +343,11 @@ int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
{
enum rfkill_state oldstate;
- if (unlikely(state >= RFKILL_STATE_MAX))
+ BUG_ON(!rfkill);
+ if (WARN((state >= RFKILL_STATE_MAX),
+ KERN_WARNING
+ "rfkill: illegal state %d passed as parameter "
+ "to rfkill_force_state\n", state))
return -EINVAL;
mutex_lock(&rfkill->mutex);
@@ -593,10 +606,10 @@ static int rfkill_check_duplicity(const struct rfkill *rfkill)
memset(seen, 0, sizeof(seen));
list_for_each_entry(p, &rfkill_list, node) {
- if (p == rfkill) {
- WARN_ON(1);
+ if (WARN((p == rfkill), KERN_WARNING
+ "rfkill: illegal attempt to register "
+ "an already registered rfkill struct\n"))
return -EEXIST;
- }
set_bit(p->type, seen);
}
@@ -664,6 +677,12 @@ struct rfkill * __must_check rfkill_allocate(struct device *parent,
struct rfkill *rfkill;
struct device *dev;
+ if (WARN((type >= RFKILL_TYPE_MAX),
+ KERN_WARNING
+ "rfkill: illegal type %d passed as parameter "
+ "to rfkill_allocate\n", type))
+ return NULL;
+
rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
if (!rfkill)
return NULL;
@@ -736,11 +755,12 @@ int __must_check rfkill_register(struct rfkill *rfkill)
struct device *dev = &rfkill->dev;
int error;
- if (!rfkill->toggle_radio)
- return -EINVAL;
- if (rfkill->type >= RFKILL_TYPE_MAX)
- return -EINVAL;
- if (rfkill->state >= RFKILL_STATE_MAX)
+ if (WARN((!rfkill || !rfkill->toggle_radio ||
+ rfkill->type >= RFKILL_TYPE_MAX ||
+ rfkill->state >= RFKILL_STATE_MAX),
+ KERN_WARNING
+ "rfkill: attempt to register a "
+ "badly initialized rfkill struct\n"))
return -EINVAL;
snprintf(dev->bus_id, sizeof(dev->bus_id),
@@ -775,6 +795,7 @@ EXPORT_SYMBOL(rfkill_register);
*/
void rfkill_unregister(struct rfkill *rfkill)
{
+ BUG_ON(!rfkill);
device_del(&rfkill->dev);
rfkill_remove_switch(rfkill);
rfkill_led_trigger_unregister(rfkill);
@@ -811,9 +832,12 @@ int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
{
int error;
- if (type >= RFKILL_TYPE_MAX ||
- (state != RFKILL_STATE_SOFT_BLOCKED &&
- state != RFKILL_STATE_UNBLOCKED))
+ if (WARN((type >= RFKILL_TYPE_MAX ||
+ (state != RFKILL_STATE_SOFT_BLOCKED &&
+ state != RFKILL_STATE_UNBLOCKED)),
+ KERN_WARNING
+ "rfkill: illegal state %d or type %d passed as "
+ "parameter to rfkill_set_default\n", state, type))
return -EINVAL;
mutex_lock(&rfkill_mutex);