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authorAlan Stern <stern@rowland.harvard.edu>2007-10-10 16:24:06 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 14:55:34 -0700
commit063a2da8f01806906f7d7b1a1424b9afddebc443 (patch)
tree960243995fe608580e842b1a34228a3f991ea4dc /drivers/usb
parentcd38c1e1ae5273c28a12baacaf17c1faa062661f (diff)
USB: serial core should respect driver requirements
This patch (as997) fixes a bug in the USB serial core. The core needs to pay attention to drivers' requirements regarding the number and type of endpoints a device has. At the same time, the patch changes the NUM_DONT_CARE constant (which is stored in a single-byte field) from -1 to a safer, unsigned value. It also improves the kerneldoc for several fields in the usb_serial_driver structure. Finally, the patch replaces a list_for_each() with list_for_each_entry(). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/usb-serial.c31
1 files changed, 22 insertions, 9 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 26e015c39a3..4b1bd7def4a 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -662,16 +662,14 @@ exit:
static struct usb_serial_driver *search_serial_device(struct usb_interface *iface)
{
- struct list_head *p;
const struct usb_device_id *id;
- struct usb_serial_driver *t;
+ struct usb_serial_driver *drv;
/* Check if the usb id matches a known device */
- list_for_each(p, &usb_serial_driver_list) {
- t = list_entry(p, struct usb_serial_driver, driver_list);
- id = get_iface_id(t, iface);
+ list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
+ id = get_iface_id(drv, iface);
if (id)
- return t;
+ return drv;
}
return NULL;
@@ -811,9 +809,6 @@ int usb_serial_probe(struct usb_interface *interface,
/* END HORRIBLE HACK FOR PL2303 */
#endif
- /* found all that we need */
- dev_info(&interface->dev, "%s converter detected\n", type->description);
-
#ifdef CONFIG_USB_SERIAL_GENERIC
if (type == &usb_serial_generic_device) {
num_ports = num_bulk_out;
@@ -847,6 +842,24 @@ int usb_serial_probe(struct usb_interface *interface,
serial->num_interrupt_in = num_interrupt_in;
serial->num_interrupt_out = num_interrupt_out;
+ /* check that the device meets the driver's requirements */
+ if ((type->num_interrupt_in != NUM_DONT_CARE &&
+ type->num_interrupt_in != num_interrupt_in)
+ || (type->num_interrupt_out != NUM_DONT_CARE &&
+ type->num_interrupt_out != num_interrupt_out)
+ || (type->num_bulk_in != NUM_DONT_CARE &&
+ type->num_bulk_in != num_bulk_in)
+ || (type->num_bulk_out != NUM_DONT_CARE &&
+ type->num_bulk_out != num_bulk_out)) {
+ dbg("wrong number of endpoints");
+ kfree(serial);
+ return -EIO;
+ }
+
+ /* found all that we need */
+ dev_info(&interface->dev, "%s converter detected\n",
+ type->description);
+
/* create our ports, we need as many as the max endpoints */
/* we don't use num_ports here cauz some devices have more endpoint pairs than ports */
max_endpoints = max(num_bulk_in, num_bulk_out);