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rfkill: add WARN and BUG_ON paranoia (v2)

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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>
This commit is contained in:
Henrique de Moraes Holschuh 2008-08-26 11:57:59 -03:00 committed by John W. Linville
parent 01b510b9c2
commit f745ba03a1
1 changed files with 37 additions and 13 deletions
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50
net/rfkill/rfkill.c
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@ -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);