On Wed, 17 Jun 2015 13:43:44 +0800 Li Jun <jun.li@xxxxxxxxxxxxx> wrote: > Allocate and initialize usb otg descriptor according to gadget otg > capabilities, add it for each usb configurations, free it while > composite unbind. If otg capability is not defined, keep its otg > descriptor unchanged. > > Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx> > --- > drivers/usb/gadget/legacy/ether.c | 38 ++++++++++++++++++++++++-------------- > 1 file changed, 24 insertions(+), 14 deletions(-) > > diff --git a/drivers/usb/gadget/legacy/ether.c b/drivers/usb/gadget/legacy/ether.c > index a3323dc..06f4a30 100644 > --- a/drivers/usb/gadget/legacy/ether.c > +++ b/drivers/usb/gadget/legacy/ether.c > @@ -171,20 +171,7 @@ static struct usb_device_descriptor device_desc = { > .bNumConfigurations = 1, > }; > > -static struct usb_otg_descriptor otg_descriptor = { > - .bLength = sizeof otg_descriptor, > - .bDescriptorType = USB_DT_OTG, > - > - /* REVISIT SRP-only hardware is possible, although > - * it would not be called "OTG" ... > - */ > - .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, > -}; > - > -static const struct usb_descriptor_header *otg_desc[] = { > - (struct usb_descriptor_header *) &otg_descriptor, > - NULL, > -}; > +static const struct usb_descriptor_header *otg_desc[2]; > > static struct usb_string strings_dev[] = { > [USB_GADGET_MANUFACTURER_IDX].s = "", > @@ -229,6 +216,16 @@ static int rndis_do_config(struct usb_configuration *c) > /* FIXME alloc iConfiguration string, set it in c->strings */ > > if (gadget_is_otg(c->cdev->gadget)) { > + if (!otg_desc[0]) { > + struct usb_descriptor_header *usb_desc; > + > + usb_desc = usb_otg_descriptor_alloc(c->cdev->gadget); > + if (!usb_desc) > + return -ENOMEM; > + usb_otg_descriptor_init(c->cdev->gadget, usb_desc); > + otg_desc[0] = usb_desc; > + otg_desc[1] = NULL; > + } Why can't you do the otg_desc alloc/init in eth_bind()? That way you don't have to have this code twice in rndis_do_config() and eth_do_config(). It also matches the free being done in eth_unbind(). > c->descriptors = otg_desc; > c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; > } > @@ -271,6 +268,16 @@ static int eth_do_config(struct usb_configuration *c) > /* FIXME alloc iConfiguration string, set it in c->strings */ > > if (gadget_is_otg(c->cdev->gadget)) { > + if (!otg_desc[0]) { > + struct usb_descriptor_header *usb_desc; > + > + usb_desc = usb_otg_descriptor_alloc(c->cdev->gadget); > + if (!usb_desc) > + return -ENOMEM; > + usb_otg_descriptor_init(c->cdev->gadget, usb_desc); > + otg_desc[0] = usb_desc; > + otg_desc[1] = NULL; > + } > c->descriptors = otg_desc; > c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; > } > @@ -463,6 +470,9 @@ static int eth_unbind(struct usb_composite_dev *cdev) > usb_put_function(f_geth); > usb_put_function_instance(fi_geth); > } > + kfree(otg_desc[0]); > + otg_desc[0] = NULL; > + > return 0; > } > cheers, -roger -- 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