Commit ab153d84 authored by David S. Miller's avatar David S. Miller

Revert "hso: Fix free of mutexes still in use."

This reverts commit 52429eb2.

On request from Alan Cox.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cd90ee17
......@@ -230,11 +230,6 @@ struct hso_serial {
struct work_struct retry_unthrottle_workqueue;
};
struct hso_mutex_t {
struct mutex mutex;
u8 allocated;
};
struct hso_device {
union {
struct hso_serial *dev_serial;
......@@ -253,7 +248,7 @@ struct hso_device {
struct device *dev;
struct kref ref;
struct hso_mutex_t *mutex;
struct mutex mutex;
};
/* Type of interface */
......@@ -369,13 +364,6 @@ static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
static spinlock_t serial_table_lock;
static struct ktermios *hso_serial_termios[HSO_SERIAL_TTY_MINORS];
static struct ktermios *hso_serial_termios_locked[HSO_SERIAL_TTY_MINORS];
/* hso_mutex_table has to be declared statically as hso_device
* is freed in hso_serial_open & hso_serial_close while
* the mutex is still in use.
*/
#define HSO_NUM_MUTEXES (HSO_SERIAL_TTY_MINORS+HSO_MAX_NET_DEVICES)
static struct hso_mutex_t hso_mutex_table[HSO_NUM_MUTEXES];
static spinlock_t hso_mutex_lock;
static const s32 default_port_spec[] = {
HSO_INTF_MUX | HSO_PORT_NETWORK,
......@@ -616,34 +604,6 @@ static void set_serial_by_index(unsigned index, struct hso_serial *serial)
spin_unlock_irqrestore(&serial_table_lock, flags);
}
static struct hso_mutex_t *hso_get_free_mutex(void)
{
int index;
struct hso_mutex_t *curr_hso_mutex;
spin_lock(&hso_mutex_lock);
for (index = 0; index < HSO_NUM_MUTEXES; index++) {
curr_hso_mutex = &hso_mutex_table[index];
if (!curr_hso_mutex->allocated) {
curr_hso_mutex->allocated = 1;
spin_unlock(&hso_mutex_lock);
return curr_hso_mutex;
}
}
printk(KERN_ERR "BUG %s: no free hso_mutexs devices in table\n"
, __func__);
spin_unlock(&hso_mutex_lock);
return NULL;
}
static void hso_free_mutex(struct hso_mutex_t *mutex)
{
spin_lock(&hso_mutex_lock);
mutex->allocated = 0;
spin_unlock(&hso_mutex_lock);
}
/* log a meaningful explanation of an USB status */
static void log_usb_status(int status, const char *function)
{
......@@ -1265,9 +1225,7 @@ void hso_unthrottle_workfunc(struct work_struct *work)
static int hso_serial_open(struct tty_struct *tty, struct file *filp)
{
struct hso_serial *serial = get_serial_by_index(tty->index);
int result1 = 0, result2 = 0;
struct mutex *hso_mutex = NULL;
int refcnt = 1;
int result;
/* sanity check */
if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
......@@ -1276,15 +1234,14 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
return -ENODEV;
}
hso_mutex = &serial->parent->mutex->mutex;
mutex_lock(hso_mutex);
mutex_lock(&serial->parent->mutex);
/* check for port already opened, if not set the termios */
/* The serial->open count needs to be here as hso_serial_close
* will be called even if hso_serial_open returns -ENODEV.
*/
serial->open_count++;
result1 = usb_autopm_get_interface(serial->parent->interface);
if (result1 < 0)
result = usb_autopm_get_interface(serial->parent->interface);
if (result < 0)
goto err_out;
D1("Opening %d", serial->minor);
......@@ -1304,10 +1261,11 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
(unsigned long)serial);
INIT_WORK(&serial->retry_unthrottle_workqueue,
hso_unthrottle_workfunc);
result2 = hso_start_serial_device(serial->parent, GFP_KERNEL);
if (result2) {
result = hso_start_serial_device(serial->parent, GFP_KERNEL);
if (result) {
hso_stop_serial_device(serial->parent);
serial->open_count--;
kref_put(&serial->parent->ref, hso_serial_ref_free);
}
} else {
D1("Port was already open");
......@@ -1316,16 +1274,11 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
usb_autopm_put_interface(serial->parent->interface);
/* done */
if (result1)
if (result)
hso_serial_tiocmset(tty, NULL, TIOCM_RTS | TIOCM_DTR, 0);
err_out:
if (result2)
refcnt = kref_put(&serial->parent->ref, hso_serial_ref_free);
mutex_unlock(hso_mutex);
if (refcnt == 0)
hso_free_mutex(container_of(hso_mutex,
struct hso_mutex_t, mutex));
return result1 == 0 ? result2 : result1;
mutex_unlock(&serial->parent->mutex);
return result;
}
/* close the requested serial port */
......@@ -1333,8 +1286,6 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
{
struct hso_serial *serial = tty->driver_data;
u8 usb_gone;
struct mutex *hso_mutex;
int refcnt;
D1("Closing serial port");
if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
......@@ -1342,9 +1293,8 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
return;
}
mutex_lock(&serial->parent->mutex);
usb_gone = serial->parent->usb_gone;
hso_mutex = &serial->parent->mutex->mutex;
mutex_lock(hso_mutex);
if (!usb_gone)
usb_autopm_get_interface(serial->parent->interface);
......@@ -1352,6 +1302,7 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
/* reset the rts and dtr */
/* do the actual close */
serial->open_count--;
kref_put(&serial->parent->ref, hso_serial_ref_free);
if (serial->open_count <= 0) {
serial->open_count = 0;
if (serial->tty) {
......@@ -1366,11 +1317,8 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
if (!usb_gone)
usb_autopm_put_interface(serial->parent->interface);
refcnt = kref_put(&serial->parent->ref, hso_serial_ref_free);
mutex_unlock(hso_mutex);
if (refcnt == 0)
hso_free_mutex(container_of(hso_mutex,
struct hso_mutex_t, mutex));
mutex_unlock(&serial->parent->mutex);
}
/* close the requested serial port */
......@@ -2136,12 +2084,8 @@ static struct hso_device *hso_create_device(struct usb_interface *intf,
hso_dev->usb = interface_to_usbdev(intf);
hso_dev->interface = intf;
kref_init(&hso_dev->ref);
hso_dev->mutex = hso_get_free_mutex();
if (!hso_dev->mutex) {
kfree(hso_dev);
return NULL;
}
mutex_init(&hso_dev->mutex->mutex);
mutex_init(&hso_dev->mutex);
INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
......@@ -2187,7 +2131,7 @@ static void hso_free_net_device(struct hso_device *hso_dev)
unregister_netdev(hso_net->net);
free_netdev(hso_net->net);
}
hso_free_mutex(hso_dev->mutex);
hso_free_device(hso_dev);
}
......@@ -2236,14 +2180,14 @@ static int hso_radio_toggle(void *data, enum rfkill_state state)
int enabled = (state == RFKILL_STATE_ON);
int rv;
mutex_lock(&hso_dev->mutex->mutex);
mutex_lock(&hso_dev->mutex);
if (hso_dev->usb_gone)
rv = 0;
else
rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
USB_CTRL_SET_TIMEOUT);
mutex_unlock(&hso_dev->mutex->mutex);
mutex_unlock(&hso_dev->mutex);
return rv;
}
......@@ -2851,8 +2795,6 @@ static void hso_free_interface(struct usb_interface *interface)
{
struct hso_serial *hso_dev;
int i;
struct mutex *hso_mutex = NULL;
int refcnt = 1;
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i]
......@@ -2860,12 +2802,10 @@ static void hso_free_interface(struct usb_interface *interface)
hso_dev = dev2ser(serial_table[i]);
if (hso_dev->tty)
tty_hangup(hso_dev->tty);
hso_mutex = &hso_dev->parent->mutex->mutex;
mutex_lock(hso_mutex);
mutex_lock(&hso_dev->parent->mutex);
hso_dev->parent->usb_gone = 1;
refcnt = kref_put(&serial_table[i]->ref,
hso_serial_ref_free);
mutex_unlock(hso_mutex);
mutex_unlock(&hso_dev->parent->mutex);
kref_put(&serial_table[i]->ref, hso_serial_ref_free);
}
}
......@@ -2884,9 +2824,6 @@ static void hso_free_interface(struct usb_interface *interface)
hso_free_net_device(network_table[i]);
}
}
if (refcnt == 0)
hso_free_mutex(container_of(hso_mutex,
struct hso_mutex_t, mutex));
}
/* Helper functions */
......@@ -2986,7 +2923,6 @@ static int __init hso_init(void)
/* Initialise the serial table semaphore and table */
spin_lock_init(&serial_table_lock);
spin_lock_init(&hso_mutex_lock);
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
serial_table[i] = NULL;
......
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