/*
* tascam-hwdep.c - a part of driver for TASCAM FireWire series
*
* Copyright (c) 2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
/*
* This codes give three functionality.
*
* 1.get firewire node information
* 2.get notification about starting/stopping stream
* 3.lock/unlock stream
*/
#include "tascam.h"
static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct snd_tscm *tscm = hwdep->private_data;
DEFINE_WAIT(wait);
union snd_firewire_event event = {
.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
};
spin_lock_irq(&tscm->lock);
while (!tscm->dev_lock_changed) {
prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&tscm->lock);
schedule();
finish_wait(&tscm->hwdep_wait, &wait);
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irq(&tscm->lock);
}
event.lock_status.status = (tscm->dev_lock_count > 0);
tscm->dev_lock_changed = false;
spin_unlock_irq(&tscm->lock);
count = min_t(long, count, sizeof(event.lock_status));
if (copy_to_user(buf, &event, count))
return -EFAULT;
return count;
}
static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
poll_table *wait)
{
struct snd_tscm *tscm = hwdep->private_data;
unsigned int events;
poll_wait(file, &tscm->hwdep_wait, wait);
spin_lock_irq(&tscm->lock);
if (tscm->dev_lock_changed)
events = POLLIN | POLLRDNORM;
else
events = 0;
spin_unlock_irq(&tscm->lock);
return events;
}
static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg)
{
struct fw_device *dev = fw_parent_device(tscm->unit);
struct snd_firewire_get_info info;
memset(&info, 0, sizeof(info));
info.type = SNDRV_FIREWIRE_TYPE_TASCAM;
info.card = dev->card->index;
*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
strlcpy(info.device_name, dev_name(&dev->device),
sizeof(info.device_name));
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int hwdep_lock(struct snd_tscm *tscm)
{
int err;
spin_lock_irq(&tscm->lock);
if (tscm->dev_lock_count == 0) {
tscm->dev_lock_count = -1;
err = 0;
} else {
err = -EBUSY;
}
spin_unlock_irq(&tscm->lock);
return err;
}
static int hwdep_unlock(struct snd_tscm *tscm)
{
int err;
spin_lock_irq(&tscm->lock);
if (tscm->dev_lock_count == -1) {
tscm->dev_lock_count = 0;
err = 0;
} else {
err = -EBADFD;
}
spin_unlock_irq(&tscm->lock);
return err;
}
static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct snd_tscm *tscm = hwdep->private_data;
spin_lock_irq(&tscm->lock);
if (tscm->dev_lock_count == -1)
tscm->dev_lock_count = 0;
spin_unlock_irq(&tscm->lock);
return 0;
}
static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct snd_tscm *tscm = hwdep->private_data;
switch (cmd) {
case SNDRV_FIREWIRE_IOCTL_GET_INFO:
return hwdep_get_info(tscm, (void __user *)arg);
case SNDRV_FIREWIRE_IOCTL_LOCK:
return hwdep_lock(tscm);
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
return hwdep_unlock(tscm);
default:
return -ENOIOCTLCMD;
}
}
#ifdef CONFIG_COMPAT
static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
return hwdep_ioctl(hwdep, file, cmd,
(unsigned long)compat_ptr(arg));
}
#else
#define hwdep_compat_ioctl NULL
#endif
static const struct snd_hwdep_ops hwdep_ops = {
.read = hwdep_read,
.release = hwdep_release,
.poll = hwdep_poll,
.ioctl = hwdep_ioctl,
.ioctl_compat = hwdep_compat_ioctl,
};
int snd_tscm_create_hwdep_device(struct snd_tscm *tscm)
{
struct snd_hwdep *hwdep;
int err;
err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep);
if (err < 0)
return err;
strcpy(hwdep->name, "Tascam");
hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM;
hwdep->ops = hwdep_ops;
hwdep->private_data = tscm;
hwdep->exclusive = true;
return err;
}
ption>mode: unified ssdiff stat only iwlwifi: mvm: Fix CSA received immediately after association
The session protection set for association is only removed when
BSS_CHANGED_BEACON_INFO is set and BSS_CHANGED_ASSOC is not set.
However, mac80211 may set both on association (in case a beacon was
already received). In this case, mac80211 will not set
BSS_CHANGED_BEACON_INFO on the next beacons because it has already
notified the beacon change, so the session protection is never removed
(until the session protection ends).
When a CSA is received within this time, the station will fail to
folllow the channel switch because it cannot schedule the time event.
Fix this by removing the session protection when
BSS_CHANGED_BEACON_INFO and BSS_CHANGED_ASSOC are both set.
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>