diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 941c2d409f8..443468e9d66 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -653,6 +653,7 @@ exit: return id; } +/* Caller must hold table_lock */ static struct usb_serial_driver *search_serial_device( struct usb_interface *iface) { @@ -718,17 +719,23 @@ int usb_serial_probe(struct usb_interface *interface, int num_ports = 0; int max_endpoints; - lock_kernel(); /* guard against unloading a serial driver module */ + mutex_lock(&table_lock); type = search_serial_device(interface); if (!type) { - unlock_kernel(); + mutex_unlock(&table_lock); dbg("none matched"); return -ENODEV; } + if (!try_module_get(type->driver.owner)) { + mutex_unlock(&table_lock); + dev_err(&interface->dev, "module get failed, exiting\n"); + return -EIO; + } + mutex_unlock(&table_lock); + serial = create_serial(dev, interface, type); if (!serial) { - unlock_kernel(); dev_err(&interface->dev, "%s - out of memory\n", __func__); return -ENOMEM; } @@ -737,20 +744,11 @@ int usb_serial_probe(struct usb_interface *interface, if (type->probe) { const struct usb_device_id *id; - if (!try_module_get(type->driver.owner)) { - unlock_kernel(); - dev_err(&interface->dev, - "module get failed, exiting\n"); - kfree(serial); - return -EIO; - } - id = get_iface_id(type, interface); retval = type->probe(serial, id); module_put(type->driver.owner); if (retval) { - unlock_kernel(); dbg("sub driver rejected device"); kfree(serial); return retval; @@ -822,7 +820,6 @@ int usb_serial_probe(struct usb_interface *interface, * properly during a later invocation of usb_serial_probe */ if (num_bulk_in == 0 || num_bulk_out == 0) { - unlock_kernel(); dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n"); kfree(serial); return -ENODEV; @@ -835,7 +832,6 @@ int usb_serial_probe(struct usb_interface *interface, if (type == &usb_serial_generic_device) { num_ports = num_bulk_out; if (num_ports == 0) { - unlock_kernel(); dev_err(&interface->dev, "Generic device with no bulk out, not allowed.\n"); kfree(serial); @@ -847,7 +843,6 @@ int usb_serial_probe(struct usb_interface *interface, /* if this device type has a calc_num_ports function, call it */ if (type->calc_num_ports) { if (!try_module_get(type->driver.owner)) { - unlock_kernel(); dev_err(&interface->dev, "module get failed, exiting\n"); kfree(serial); @@ -878,7 +873,6 @@ int usb_serial_probe(struct usb_interface *interface, max_endpoints = max(max_endpoints, num_interrupt_out); max_endpoints = max(max_endpoints, (int)serial->num_ports); serial->num_port_pointers = max_endpoints; - unlock_kernel(); dbg("%s - setting up %d port structures for this device", __func__, max_endpoints); @@ -1349,6 +1343,7 @@ int usb_serial_register(struct usb_serial_driver *driver) driver->description = driver->driver.name; /* Add this device to our list of devices */ + mutex_lock(&table_lock); list_add(&driver->driver_list, &usb_serial_driver_list); retval = usb_serial_bus_register(driver); @@ -1360,6 +1355,7 @@ int usb_serial_register(struct usb_serial_driver *driver) printk(KERN_INFO "USB Serial support registered for %s\n", driver->description); + mutex_unlock(&table_lock); return retval; } EXPORT_SYMBOL_GPL(usb_serial_register); @@ -1370,8 +1366,10 @@ void usb_serial_deregister(struct usb_serial_driver *device) /* must be called with BKL held */ printk(KERN_INFO "USB Serial deregistering driver %s\n", device->description); + mutex_lock(&table_lock); list_del(&device->driver_list); usb_serial_bus_deregister(device); + mutex_unlock(&table_lock); } EXPORT_SYMBOL_GPL(usb_serial_deregister); |