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authorOliver Neukum <oneukum@suse.de>2007-01-13 07:29:26 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-07 15:44:38 -0800
commit34ef50e5b1f96c2d8c0f3d28b7d407743806256c (patch)
treebdf5fe45a270ebd77c895c7563c3fbf4c230019a /drivers
parentfdcba53e2d58272bcdb5f1fad694602ccf02ad46 (diff)
USB: race fixes for usb-serial step 1
- introduce a spinlock for serial_table to eliminate the window between looking up a device and getting a reference - delay inscription of a new device into serial_table until it is fully initialised - make sure disconnect() kills all URBs to avoid leckage across a soft unbind Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/serial/usb-serial.c44
1 files changed, 31 insertions, 13 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 90beb5c50e5..3780362eb9f 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -59,14 +59,19 @@ static struct usb_driver usb_serial_driver = {
static int debug;
static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; /* initially all NULL */
+static spinlock_t table_lock;
static LIST_HEAD(usb_serial_driver_list);
struct usb_serial *usb_serial_get_by_index(unsigned index)
{
- struct usb_serial *serial = serial_table[index];
+ struct usb_serial *serial;
+
+ spin_lock(&table_lock);
+ serial = serial_table[index];
if (serial)
kref_get(&serial->kref);
+ spin_unlock(&table_lock);
return serial;
}
@@ -78,6 +83,7 @@ static struct usb_serial *get_free_serial (struct usb_serial *serial, int num_po
dbg("%s %d", __FUNCTION__, num_ports);
*minor = 0;
+ spin_lock(&table_lock);
for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
if (serial_table[i])
continue;
@@ -96,8 +102,10 @@ static struct usb_serial *get_free_serial (struct usb_serial *serial, int num_po
dbg("%s - minor base = %d", __FUNCTION__, *minor);
for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i)
serial_table[i] = serial;
+ spin_unlock(&table_lock);
return serial;
}
+ spin_unlock(&table_lock);
return NULL;
}
@@ -110,9 +118,11 @@ static void return_serial(struct usb_serial *serial)
if (serial == NULL)
return;
+ spin_lock(&table_lock);
for (i = 0; i < serial->num_ports; ++i) {
serial_table[serial->minor + i] = NULL;
}
+ spin_unlock(&table_lock);
}
static void destroy_serial(struct kref *kref)
@@ -559,15 +569,20 @@ static void port_release(struct device *dev)
port_free(port);
}
-static void port_free(struct usb_serial_port *port)
+static void kill_traffic(struct usb_serial_port *port)
{
usb_kill_urb(port->read_urb);
- usb_free_urb(port->read_urb);
usb_kill_urb(port->write_urb);
- usb_free_urb(port->write_urb);
usb_kill_urb(port->interrupt_in_urb);
- usb_free_urb(port->interrupt_in_urb);
usb_kill_urb(port->interrupt_out_urb);
+}
+
+static void port_free(struct usb_serial_port *port)
+{
+ kill_traffic(port);
+ usb_free_urb(port->read_urb);
+ usb_free_urb(port->write_urb);
+ usb_free_urb(port->interrupt_in_urb);
usb_free_urb(port->interrupt_out_urb);
kfree(port->bulk_in_buffer);
kfree(port->bulk_out_buffer);
@@ -802,12 +817,6 @@ int usb_serial_probe(struct usb_interface *interface,
num_ports = type->num_ports;
}
- if (get_free_serial (serial, num_ports, &minor) == NULL) {
- dev_err(&interface->dev, "No more free serial devices\n");
- kfree (serial);
- return -ENOMEM;
- }
-
serial->minor = minor;
serial->num_ports = num_ports;
serial->num_bulk_in = num_bulk_in;
@@ -956,6 +965,11 @@ int usb_serial_probe(struct usb_interface *interface,
}
}
+ if (get_free_serial (serial, num_ports, &minor) == NULL) {
+ dev_err(&interface->dev, "No more free serial devices\n");
+ goto probe_error;
+ }
+
/* register all of the individual ports with the driver core */
for (i = 0; i < num_ports; ++i) {
port = serial->port[i];
@@ -1033,8 +1047,11 @@ void usb_serial_disconnect(struct usb_interface *interface)
if (serial) {
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
- if (port && port->tty)
- tty_hangup(port->tty);
+ if (port) {
+ if (port->tty)
+ tty_hangup(port->tty);
+ kill_traffic(port);
+ }
}
/* let the last holder of this object
* cause it to be cleaned up */
@@ -1071,6 +1088,7 @@ static int __init usb_serial_init(void)
return -ENOMEM;
/* Initialize our global data */
+ spin_lock_init(&table_lock);
for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
serial_table[i] = NULL;
}