On Sat, Nov 19, 2016 at 09:55:45AM +0300, Eugene Korenevsky wrote: > Rework smelling code (goto inside compound statement). Perhaps this is > legacy. Anyway such code is not appropriate for Linux kernel. > > Signed-off-by: Eugene Korenevsky <ekorenevsky@xxxxxxxxx> > --- > Changes in v6: more pedantic conversion from `int` to `bool`; fix comment > Changes in v5: make `bool` a return type of `hub_check_descriptor_sanity()` > Changes in v4: fix typo > Changes in v3: extract the code to static function > Changes in v2: fix spaces instead of tab, add missing 'Signed-off-by' > > drivers/usb/core/hub.c | 38 +++++++++++++++++++++----------------- > 1 file changed, 21 insertions(+), 17 deletions(-) > > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c > index cbb1467..dbebfe4 100644 > --- a/drivers/usb/core/hub.c > +++ b/drivers/usb/core/hub.c > @@ -1722,10 +1722,28 @@ static void hub_disconnect(struct usb_interface *intf) > kref_put(&hub->kref, hub_release); > } > > +static bool hub_check_descriptor_sanity(struct usb_host_interface *desc) > +{ > + /* Some hubs have a subclass of 1, which AFAICT according to the */ > + /* specs is not defined, but it works */ > + if (desc->desc.bInterfaceSubClass != 0 && > + desc->desc.bInterfaceSubClass != 1) > + return false; > + > + /* Multiple endpoints? What kind of mutant ninja-hub is this? */ > + if (desc->desc.bNumEndpoints != 1) > + return false; > + > + /* If the first endpoint is not interrupt IN, we'd better punt! */ > + if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) > + return false; > + > + return true; > +} > + > static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) > { > struct usb_host_interface *desc; > - struct usb_endpoint_descriptor *endpoint; > struct usb_device *hdev; > struct usb_hub *hub; > > @@ -1800,25 +1818,11 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) > } > #endif > > - /* Some hubs have a subclass of 1, which AFAICT according to the */ > - /* specs is not defined, but it works */ > - if ((desc->desc.bInterfaceSubClass != 0) && > - (desc->desc.bInterfaceSubClass != 1)) { > -descriptor_error: > + if (!hub_check_descriptor_sanity(desc)) { Read that line out loud please, and tell me it makes sense: If not hub_check_descriptor_sanity(). Doesn't: If not hub_descriptor_is_sane() make more sense? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html