usb: raw-gadget: fix handling of dual-direction-capable endpoints

Under dummy_hcd, every available endpoint is *either* IN or OUT capable.
But with some real hardware, there are endpoints that support both IN and
OUT. In particular, the PLX 2380 has four available endpoints that each
support both IN and OUT.

raw-gadget currently gets confused and thinks that any endpoint that is
usable as an IN endpoint can never be used as an OUT endpoint.

Fix it by looking at the direction in the configured endpoint descriptor
instead of looking at the hardware capabilities.

With this change, I can use the PLX 2380 with raw-gadget.

Fixes: 36f4122a898f ("usb: gadget: add raw-gadget interface")
Cc: stable <stable@vger.kernel.org>
Tested-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/r/20220126205214.2149936-1-jannh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c
index c5a2c734234a5cc0eeda1a223612089c346de535..d86c3a36441ee998f8a8a8f8813ad5478d786281 100644 (file)
--- a/drivers/usb/gadget/legacy/raw_gadget.c
+++ b/drivers/usb/gadget/legacy/raw_gadget.c
@@ -1004,7 +1004,7 @@ static int raw_process_ep_io(struct raw_dev *dev, struct usb_raw_ep_io *io,
                ret = -EBUSY;
                goto out_unlock;
        }
-       if ((in && !ep->ep->caps.dir_in) || (!in && ep->ep->caps.dir_in)) {
+       if (in != usb_endpoint_dir_in(ep->ep->desc)) {
                dev_dbg(&dev->gadget->dev, "fail, wrong direction\n");
                ret = -EINVAL;
                goto out_unlock;