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rfkill: do not allow userspace to override ALL RADIOS OFF

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SW_RFKILL_ALL is the "emergency power-off all radios" input event.  It must
be handled, and must always do the same thing as far as the rfkill system
is concerned: all transmitters are to go *immediately* offline.

For safety, do NOT allow userspace to override EV_SW SW_RFKILL_ALL OFF.  As
long as rfkill-input is loaded, that event will *always* be processed, and
it will *always* force all rfkill switches to disable all wireless
transmitters, regardless of user_claim attribute or anything else.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Henrique de Moraes Holschuh 2008-06-23 17:23:07 -03:00 • committed by John W. Linville
parent fbc6af2f3c
commit 4081f00dc4
3 changed files with 51 additions and 15 deletions
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18
net/rfkill/rfkill.c
View file

@ -181,6 +181,24 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
}
EXPORT_SYMBOL(rfkill_switch_all);
/**
* rfkill_epo - emergency power off all transmitters
*
* This kicks all rfkill devices to RFKILL_STATE_OFF, ignoring
* everything in its path but rfkill_mutex.
*/
void rfkill_epo(void)
{
struct rfkill *rfkill;
mutex_lock(&rfkill_mutex);
list_for_each_entry(rfkill, &rfkill_list, node) {
rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF, 1);
}
mutex_unlock(&rfkill_mutex);
}
EXPORT_SYMBOL_GPL(rfkill_epo);
/**
* rfkill_force_state - Force the internal rfkill radio state
* @rfkill: pointer to the rfkill class to modify.