diff mbox series

[RFC,v5,4/6] usb: gadget: configfs: Check USB configuration before adding

Message ID 20200829055846.19034-5-wcheng@codeaurora.org
State Superseded
Headers show
Series Re-introduce TX FIFO resize for larger EP bursting | expand

Commit Message

Wesley Cheng Aug. 29, 2020, 5:58 a.m. UTC
Ensure that the USB gadget is able to support the configuration being
added based on the number of endpoints required from all interfaces.  This
is for accounting for any bandwidth or space limitations.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 drivers/usb/gadget/configfs.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
diff mbox series

Patch

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 56051bb97349..7c74c04b1d8c 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -1361,6 +1361,7 @@  static int configfs_composite_bind(struct usb_gadget *gadget,
 		struct usb_function *f;
 		struct usb_function *tmp;
 		struct gadget_config_name *cn;
+		unsigned long ep_map = 0;
 
 		if (gadget_is_otg(gadget))
 			c->descriptors = otg_desc;
@@ -1390,7 +1391,28 @@  static int configfs_composite_bind(struct usb_gadget *gadget,
 				list_add(&f->list, &cfg->func_list);
 				goto err_purge_funcs;
 			}
+			if (f->ss_descriptors) {
+				struct usb_descriptor_header **d;
+
+				d = f->ss_descriptors;
+				for (; *d; ++d) {
+					struct usb_endpoint_descriptor *ep;
+					int addr;
+
+					if ((*d)->bDescriptorType != USB_DT_ENDPOINT)
+						continue;
+
+					ep = (struct usb_endpoint_descriptor *)*d;
+					addr = ((ep->bEndpointAddress & 0x80) >> 3) |
+						(ep->bEndpointAddress & 0x0f);
+					set_bit(addr, &ep_map);
+				}
+			}
 		}
+		ret = usb_gadget_check_config(cdev->gadget, ep_map);
+		if (ret)
+			goto err_purge_funcs;
+
 		usb_ep_autoconfig_reset(cdev->gadget);
 	}
 	if (cdev->use_os_string) {