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authorAlan Cox <alan@redhat.com>2009-01-02 13:47:39 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-02 10:19:41 -0800
commite136e3036bf27569dbfeae245cc09c7167cdc749 (patch)
tree106be43f343a4fce34076781df05af0d32e2799a /drivers/net
parent33dd474ae712dc435eb586b44cb771cc8d24e2bd (diff)
hso: net driver using tty without locking
Checking tty == NULL doesn't help us unless we have a clear semantic for the locking of the tty object in the driver. Use the tty kref objects so that we can take references to the tty in the USB event handling paths. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/usb/hso.c54
1 files changed, 42 insertions, 12 deletions
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 9f7896a25f1..d345a6eec4c 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -1015,7 +1015,7 @@ static void _hso_serial_set_termios(struct tty_struct *tty,
struct hso_serial *serial = get_serial_by_tty(tty);
struct ktermios *termios;
- if ((!tty) || (!tty->termios) || (!serial)) {
+ if (!serial) {
printk(KERN_ERR "%s: no tty structures", __func__);
return;
}
@@ -1057,14 +1057,14 @@ static void _hso_serial_set_termios(struct tty_struct *tty,
termios->c_cflag |= CS8; /* character size 8 bits */
/* baud rate 115200 */
- tty_encode_baud_rate(serial->tty, 115200, 115200);
+ tty_encode_baud_rate(tty, 115200, 115200);
/*
* Force low_latency on; otherwise the pushes are scheduled;
* this is bad as it opens up the possibility of dropping bytes
* on the floor. We don't want to drop bytes on the floor. :)
*/
- serial->tty->low_latency = 1;
+ tty->low_latency = 1;
return;
}
@@ -1228,6 +1228,7 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
/* sanity check */
if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
+ WARN_ON(1);
tty->driver_data = NULL;
D1("Failed to open port");
return -ENODEV;
@@ -1242,8 +1243,10 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
kref_get(&serial->parent->ref);
/* setup */
+ spin_lock_irq(&serial->serial_lock);
tty->driver_data = serial;
- serial->tty = tty;
+ serial->tty = tty_kref_get(tty);
+ spin_unlock_irq(&serial->serial_lock);
/* check for port already opened, if not set the termios */
serial->open_count++;
@@ -1285,6 +1288,10 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
D1("Closing serial port");
+ /* Open failed, no close cleanup required */
+ if (serial == NULL)
+ return;
+
mutex_lock(&serial->parent->mutex);
usb_gone = serial->parent->usb_gone;
@@ -1297,10 +1304,13 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
kref_put(&serial->parent->ref, hso_serial_ref_free);
if (serial->open_count <= 0) {
serial->open_count = 0;
- if (serial->tty) {
+ spin_lock_irq(&serial->serial_lock);
+ if (serial->tty == tty) {
serial->tty->driver_data = NULL;
serial->tty = NULL;
+ tty_kref_put(tty);
}
+ spin_unlock_irq(&serial->serial_lock);
if (!usb_gone)
hso_stop_serial_device(serial->parent);
tasklet_kill(&serial->unthrottle_tasklet);
@@ -1653,6 +1663,7 @@ static void hso_std_serial_write_bulk_callback(struct urb *urb)
{
struct hso_serial *serial = urb->context;
int status = urb->status;
+ struct tty_struct *tty;
/* sanity check */
if (!serial) {
@@ -1662,14 +1673,18 @@ static void hso_std_serial_write_bulk_callback(struct urb *urb)
spin_lock(&serial->serial_lock);
serial->tx_urb_used = 0;
+ tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
if (status) {
log_usb_status(status, __func__);
+ tty_kref_put(tty);
return;
}
hso_put_activity(serial->parent);
- if (serial->tty)
- tty_wakeup(serial->tty);
+ if (tty) {
+ tty_wakeup(tty);
+ tty_kref_put(tty);
+ }
hso_kick_transmit(serial);
D1(" ");
@@ -1706,6 +1721,7 @@ static void ctrl_callback(struct urb *urb)
struct hso_serial *serial = urb->context;
struct usb_ctrlrequest *req;
int status = urb->status;
+ struct tty_struct *tty;
/* sanity check */
if (!serial)
@@ -1713,9 +1729,11 @@ static void ctrl_callback(struct urb *urb)
spin_lock(&serial->serial_lock);
serial->tx_urb_used = 0;
+ tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
if (status) {
log_usb_status(status, __func__);
+ tty_kref_put(tty);
return;
}
@@ -1734,25 +1752,31 @@ static void ctrl_callback(struct urb *urb)
spin_unlock(&serial->serial_lock);
} else {
hso_put_activity(serial->parent);
- if (serial->tty)
- tty_wakeup(serial->tty);
+ if (tty)
+ tty_wakeup(tty);
/* response to a write command */
hso_kick_transmit(serial);
}
+ tty_kref_put(tty);
}
/* handle RX data for serial port */
static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
{
- struct tty_struct *tty = serial->tty;
+ struct tty_struct *tty;
int write_length_remaining = 0;
int curr_write_len;
+
/* Sanity check */
if (urb == NULL || serial == NULL) {
D1("serial = NULL");
return -2;
}
+ spin_lock(&serial->serial_lock);
+ tty = tty_kref_get(serial->tty);
+ spin_unlock(&serial->serial_lock);
+
/* Push data to tty */
if (tty) {
write_length_remaining = urb->actual_length -
@@ -1774,6 +1798,7 @@ static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
serial->curr_rx_urb_offset = 0;
serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
}
+ tty_kref_put(tty);
return write_length_remaining;
}
@@ -2786,15 +2811,20 @@ static void hso_serial_ref_free(struct kref *ref)
static void hso_free_interface(struct usb_interface *interface)
{
struct hso_serial *hso_dev;
+ struct tty_struct *tty;
int i;
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i]
&& (serial_table[i]->interface == interface)) {
hso_dev = dev2ser(serial_table[i]);
- if (hso_dev->tty)
- tty_hangup(hso_dev->tty);
+ spin_lock_irq(&hso_dev->serial_lock);
+ tty = tty_kref_get(hso_dev->tty);
+ spin_unlock_irq(&hso_dev->serial_lock);
+ if (tty)
+ tty_hangup(tty);
mutex_lock(&hso_dev->parent->mutex);
+ tty_kref_put(tty);
hso_dev->parent->usb_gone = 1;
mutex_unlock(&hso_dev->parent->mutex);
kref_put(&serial_table[i]->ref, hso_serial_ref_free);