u64 ts = ktime_get_ns();
struct cec_fh *fh;
- mutex_lock(&adap->devnode.lock);
+ mutex_lock(&adap->devnode.lock_fhs);
list_for_each_entry(fh, &adap->devnode.fhs, list)
cec_queue_event_fh(fh, ev, ts);
- mutex_unlock(&adap->devnode.lock);
+ mutex_unlock(&adap->devnode.lock_fhs);
}
/* Notify userspace that the CEC pin changed state at the given time. */
};
struct cec_fh *fh;
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list)
+ mutex_lock(&adap->devnode.lock_fhs);
+ list_for_each_entry(fh, &adap->devnode.fhs, list) {
if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
- mutex_unlock(&adap->devnode.lock);
+ }
+ mutex_unlock(&adap->devnode.lock_fhs);
}
EXPORT_SYMBOL_GPL(cec_queue_pin_cec_event);
};
struct cec_fh *fh;
- mutex_lock(&adap->devnode.lock);
+ mutex_lock(&adap->devnode.lock_fhs);
list_for_each_entry(fh, &adap->devnode.fhs, list)
cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
- mutex_unlock(&adap->devnode.lock);
+ mutex_unlock(&adap->devnode.lock_fhs);
}
EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event);
};
struct cec_fh *fh;
- mutex_lock(&adap->devnode.lock);
+ mutex_lock(&adap->devnode.lock_fhs);
list_for_each_entry(fh, &adap->devnode.fhs, list)
cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
- mutex_unlock(&adap->devnode.lock);
+ mutex_unlock(&adap->devnode.lock_fhs);
}
EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event);
u32 monitor_mode = valid_la ? CEC_MODE_MONITOR :
CEC_MODE_MONITOR_ALL;
- mutex_lock(&adap->devnode.lock);
+ mutex_lock(&adap->devnode.lock_fhs);
list_for_each_entry(fh, &adap->devnode.fhs, list) {
if (fh->mode_follower >= monitor_mode)
cec_queue_msg_fh(fh, msg);
}
- mutex_unlock(&adap->devnode.lock);
+ mutex_unlock(&adap->devnode.lock_fhs);
}
/*
{
struct cec_fh *fh;
- mutex_lock(&adap->devnode.lock);
+ mutex_lock(&adap->devnode.lock_fhs);
list_for_each_entry(fh, &adap->devnode.fhs, list) {
if (fh->mode_follower == CEC_MODE_FOLLOWER)
cec_queue_msg_fh(fh, msg);
}
- mutex_unlock(&adap->devnode.lock);
+ mutex_unlock(&adap->devnode.lock_fhs);
}
/* Notify userspace of an adapter state change. */
/* Disabling monitor all mode should always succeed */
if (adap->monitor_all_cnt)
WARN_ON(call_op(adap, adap_monitor_all_enable, false));
+ /* serialize adap_enable */
mutex_lock(&adap->devnode.lock);
if (adap->needs_hpd || list_empty(&adap->devnode.fhs)) {
WARN_ON(adap->ops->adap_enable(adap, false));
return;
}
+ /* serialize adap_enable */
mutex_lock(&adap->devnode.lock);
adap->last_initiator = 0xff;
adap->transmit_in_progress = false;
- if ((adap->needs_hpd || list_empty(&adap->devnode.fhs)) &&
- adap->ops->adap_enable(adap, true)) {
- mutex_unlock(&adap->devnode.lock);
- return;
+ if (adap->needs_hpd || list_empty(&adap->devnode.fhs)) {
+ if (adap->ops->adap_enable(adap, true)) {
+ mutex_unlock(&adap->devnode.lock);
+ return;
+ }
}
if (adap->monitor_all_cnt &&
return err;
}
+ /* serialize adap_enable */
mutex_lock(&devnode->lock);
if (list_empty(&devnode->fhs) &&
!adap->needs_hpd &&
}
#endif
+ mutex_lock(&devnode->lock_fhs);
list_add(&fh->list, &devnode->fhs);
+ mutex_unlock(&devnode->lock_fhs);
mutex_unlock(&devnode->lock);
return 0;
cec_monitor_all_cnt_dec(adap);
mutex_unlock(&adap->lock);
+ /* serialize adap_enable */
mutex_lock(&devnode->lock);
+ mutex_lock(&devnode->lock_fhs);
list_del(&fh->list);
+ mutex_unlock(&devnode->lock_fhs);
if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
!adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
WARN_ON(adap->ops->adap_enable(adap, false));
* @dev: cec device
* @cdev: cec character device
* @minor: device node minor number
+ * @lock: lock to serialize open/release and registration
* @registered: the device was correctly registered
* @unregistered: the device was unregistered
+ * @lock_fhs: lock to control access to @fhs
* @fhs: the list of open filehandles (cec_fh)
- * @lock: lock to control access to this structure
*
* This structure represents a cec-related device node.
*
+ * To add or remove filehandles from @fhs the @lock must be taken first,
+ * followed by @lock_fhs. It is safe to access @fhs if either lock is held.
+ *
* The @parent is a physical device. It must be set by core or device drivers
* before registering the node.
*/
/* device info */
int minor;
+ /* serialize open/release and registration */
+ struct mutex lock;
bool registered;
bool unregistered;
+ /* protect access to fhs */
+ struct mutex lock_fhs;
struct list_head fhs;
- struct mutex lock;
};
struct cec_adapter;