Some UDC may want to allocate endpoints dynamically, either because
the HW supports an arbitrary large number or because (like the Aspeed
BMC SoCs), the pool of HW endpoints is shared between multiple gadgets.
The allocation side can be done rather easily using the existing
match_ep() UDC hook.
However we have no good place to "free" them.
This implements a "simple" variant of this, which calls an EP dispose
callback on all EPs associated with a gadget when the composite device
gets unbound.
A more complex approach would track which configuration uses which EPs
but that's overkill at this stage.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
drivers/usb/gadget/composite.c | 10 +++++++++-
drivers/usb/gadget/epautoconf.c | 8 ++++++--
include/linux/usb/gadget.h | 1 +
3 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 49d685a..caed089 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -899,7 +899,7 @@ int usb_add_config(struct usb_composite_dev *cdev,
status = bind(config);
if (status < 0) {
while (!list_empty(&config->functions)) {
- struct usb_function *f;
+ struct usb_function *f;
f = list_first_entry(&config->functions,
struct usb_function, list);
@@ -2159,6 +2159,7 @@ int composite_os_desc_req_prepare(struct
usb_composite_dev *cdev,
void composite_dev_cleanup(struct usb_composite_dev *cdev)
{
struct usb_gadget_string_container *uc, *tmp;
+ struct usb_ep *ep, *tmp_ep;
list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
list_del(&uc->list);
@@ -2180,6 +2181,13 @@ void composite_dev_cleanup(struct usb_composite_dev
*cdev)
}
cdev->next_string_id = 0;
device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
+
+ /* Dispose EPs if the UDC driver tracks lifetime */
+ list_for_each_entry_safe(ep, tmp_ep,
+ &cdev->gadget->ep_list, ep_list) {
+ if (ep->ops->dispose)
+ ep->ops->dispose(ep);
+ }
}
static int composite_bind(struct usb_gadget *gadget,
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index e4516e9..b9299a0 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -126,6 +126,7 @@ struct usb_ep_ops {
int (*enable) (struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc);
int (*disable) (struct usb_ep *ep);
+ void (*dispose) (struct usb_ep *ep);
struct usb_request *(*alloc_request) (struct usb_ep *ep,
gfp_t gfp_flags);
--
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