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rfkill: document the rfkill struct locking (v2) 

Reorder fields in struct rfkill and add comments to make it clear
which fields are protected by rfkill->mutex.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Henrique de Moraes Holschuh 2008-07-21 21:18:19 -03:00 committed by John W. Linville
parent 37f55e9d78
commit f1b23361a0
1 changed files with 5 additions and 3 deletions
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8
include/linux/rfkill.h
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@ -68,7 +68,8 @@ enum rfkill_state {
* @user_claim_unsupported: Whether the hardware supports exclusive
* RF-kill control by userspace. Set this before registering.
* @user_claim: Set when the switch is controlled exlusively by userspace.
* @mutex: Guards switch state transitions
* @mutex: Guards switch state transitions. It serializes callbacks
* and also protects the state.
* @data: Pointer to the RF button drivers private data which will be
* passed along when toggling radio state.
* @toggle_radio(): Mandatory handler to control state of the radio.
@ -89,12 +90,13 @@ struct rfkill {
const char *name;
enum rfkill_type type;
enum rfkill_state state;
bool user_claim_unsupported;
bool user_claim;
/* the mutex serializes callbacks and also protects
* the state */
struct mutex mutex;
enum rfkill_state state;
void *data;
int (*toggle_radio)(void *data, enum rfkill_state state);
int (*get_state)(void *data, enum rfkill_state *state);