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usb: raw-gadget: return -EINVAL if no proper ep address available

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If we try to use raw_ioctl_ep_enable() for ep5in on a hardware that
only support from ep1-ep4 for both in and out direction, it will return
-EBUSY originally.

I think it will be more intuitive if we return -EINVAL, because -EBUSY
sounds like ep5in is not available now, but might be available in the
future.

Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Wei Ming Chen <jj251510319013@gmail.com>
Link: https://lore.kernel.org/r/20220311082944.4881-1-jj251510319013@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wei Ming Chen 2022-03-11 16:29:45 +08:00 committed by Greg Kroah-Hartman
parent 801109b1a3
commit 0d48aee69c
1 changed files with 11 additions and 4 deletions
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15
drivers/usb/gadget/legacy/raw_gadget.c
View file

@ -758,6 +758,7 @@ static int raw_ioctl_ep_enable(struct raw_dev *dev, unsigned long value)
unsigned long flags;
struct usb_endpoint_descriptor *desc;
struct raw_ep *ep;
bool ep_props_matched = false;
desc = memdup_user((void __user *)value, sizeof(*desc));
if (IS_ERR(desc))
@ -787,13 +788,14 @@ static int raw_ioctl_ep_enable(struct raw_dev *dev, unsigned long value)
for (i = 0; i < dev->eps_num; i++) {
ep = &dev->eps[i];
if (ep->state != STATE_EP_DISABLED)
continue;
if (ep->addr != usb_endpoint_num(desc) &&
ep->addr != USB_RAW_EP_ADDR_ANY)
continue;
if (!usb_gadget_ep_match_desc(dev->gadget, ep->ep, desc, NULL))
continue;
ep_props_matched = true;
if (ep->state != STATE_EP_DISABLED)
continue;
ep->ep->desc = desc;
ret = usb_ep_enable(ep->ep);
if (ret < 0) {
@ -815,8 +817,13 @@ static int raw_ioctl_ep_enable(struct raw_dev *dev, unsigned long value)
goto out_unlock;
}
dev_dbg(&dev->gadget->dev, "fail, no gadget endpoints available\n");
ret = -EBUSY;
if (!ep_props_matched) {
dev_dbg(&dev->gadget->dev, "fail, bad endpoint descriptor\n");
ret = -EINVAL;
} else {
dev_dbg(&dev->gadget->dev, "fail, no endpoints available\n");
ret = -EBUSY;
}
out_free:
kfree(desc);