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authorMing Lei <tom.leiming@gmail.com>2010-08-07 16:20:35 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-23 20:50:15 -0700
commitd92a3ca689257c6bec94e026538782c280afaaab (patch)
tree632adc518c4e76a343e4e975a925261e6b4ff525 /drivers
parent0eee6a2b2a52e17066a572d30ad2805d3ebc7508 (diff)
USB: serial: fix leak of usb serial module refrence count
The patch with title below makes reference count of usb serial module always more than one after driver is bound. USB-BKL: Remove BKL use for usb serial driver probing In fact, the patch above only replaces lock_kernel() with try_module_get() , and does not use module_put() to do what unlock_kernel() did, so casue leak of reference count of usb serial module and the module can not be unloaded after serial driver is bound with device. This patch fixes the issue, also simplifies such things: -only call try_module_get() once in the entry of usb_serial_probe() -only call module_put() once in the exit of usb_serial_probe Signed-off-by: Ming Lei <tom.leiming@gmail.com> Cc: Johan Hovold <jhovold@gmail.com> Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/serial/usb-serial.c23
1 files changed, 7 insertions, 16 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 2a982e62963b..7a2177c79bde 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -736,6 +736,7 @@ int usb_serial_probe(struct usb_interface *interface,
serial = create_serial(dev, interface, type);
if (!serial) {
+ module_put(type->driver.owner);
dev_err(&interface->dev, "%s - out of memory\n", __func__);
return -ENOMEM;
}
@@ -746,11 +747,11 @@ int usb_serial_probe(struct usb_interface *interface,
id = get_iface_id(type, interface);
retval = type->probe(serial, id);
- module_put(type->driver.owner);
if (retval) {
dbg("sub driver rejected device");
kfree(serial);
+ module_put(type->driver.owner);
return retval;
}
}
@@ -822,6 +823,7 @@ int usb_serial_probe(struct usb_interface *interface,
if (num_bulk_in == 0 || num_bulk_out == 0) {
dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
kfree(serial);
+ module_put(type->driver.owner);
return -ENODEV;
}
}
@@ -835,22 +837,15 @@ int usb_serial_probe(struct usb_interface *interface,
dev_err(&interface->dev,
"Generic device with no bulk out, not allowed.\n");
kfree(serial);
+ module_put(type->driver.owner);
return -EIO;
}
}
#endif
if (!num_ports) {
/* if this device type has a calc_num_ports function, call it */
- if (type->calc_num_ports) {
- if (!try_module_get(type->driver.owner)) {
- dev_err(&interface->dev,
- "module get failed, exiting\n");
- kfree(serial);
- return -EIO;
- }
+ if (type->calc_num_ports)
num_ports = type->calc_num_ports(serial);
- module_put(type->driver.owner);
- }
if (!num_ports)
num_ports = type->num_ports;
}
@@ -1039,13 +1034,7 @@ int usb_serial_probe(struct usb_interface *interface,
/* if this device type has an attach function, call it */
if (type->attach) {
- if (!try_module_get(type->driver.owner)) {
- dev_err(&interface->dev,
- "module get failed, exiting\n");
- goto probe_error;
- }
retval = type->attach(serial);
- module_put(type->driver.owner);
if (retval < 0)
goto probe_error;
serial->attached = 1;
@@ -1088,10 +1077,12 @@ int usb_serial_probe(struct usb_interface *interface,
exit:
/* success */
usb_set_intfdata(interface, serial);
+ module_put(type->driver.owner);
return 0;
probe_error:
usb_serial_put(serial);
+ module_put(type->driver.owner);
return -EIO;
}
EXPORT_SYMBOL_GPL(usb_serial_probe);