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authorStephen Warren <swarren@nvidia.com>2014-06-23 12:02:48 -0600
committerMarek Vasut <marex@denx.de>2014-06-25 22:22:20 +0200
commitfb22ae6c7e0ffe438103c948c87c5ddf2ef56e7e (patch)
tree03b37ea3b74d164622335d80985187a57c651c3c /drivers/usb/gadget
parentba9b42c81b0734d53edfbb1fe4a6ded7de78c5ab (diff)
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usb: ci_udc: fix interaction with CONFIG_USB_ETH_CDC
ci_udc.c's usb_gadget_unregister_driver() doesn't call driver->unbind() unlike other USB gadget drivers. Fix it to do this. Without this, when ether.c's CDC Ethernet device is torn down, eth_unbind() is never called, so dev->gadget is never set to NULL. For some reason, usb_eth_halt() is called both at the end of the first use of the Ethernet device, and prior to any subsequent use. Since dev->gadget is never cleared, all calls to usb_eth_halt() attempt to stop, disconnect, and clean up the device, resulting in double cleanup, which hangs U-Boot on my Tegra device at least. ci_udc allocates its own singleton EP0 request object, and cleans it up during usb_gadget_unregister_driver(). This appears necessary when using the USB gadget framework in U-Boot, since that does not allocate/free the EP0 request. However, the CDC Ethernet driver *does* allocate and free its own EP0 requests. Consequently, we must protect ci_ep_free_request() against double-freeing the request. Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/ci_udc.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c
index b18bee4..c3f6467 100644
--- a/drivers/usb/gadget/ci_udc.c
+++ b/drivers/usb/gadget/ci_udc.c
@@ -226,8 +226,11 @@ static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *req)
int num;
num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
- if (num == 0)
+ if (num == 0) {
+ if (!controller.ep0_req)
+ return;
controller.ep0_req = 0;
+ }
if (ci_req->b_buf)
free(ci_req->b_buf);
@@ -909,6 +912,9 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
udc_disconnect();
+ driver->unbind(&controller.gadget);
+ controller.driver = NULL;
+
ci_ep_free_request(&controller.ep[0].ep, &controller.ep0_req->req);
free(controller.items_mem);
free(controller.epts);