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UPSTREAM: usb: gadget: udc: Handle gadget_connect failure during bind operation

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In the event gadget_connect call (which invokes pullup) fails,
propagate the error to udc bind operation which in turn sends the
error to configfs. The userspace can then retry enumeration if
it chooses to.

Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20230927073027.27952-1-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit 0ea39e030a80be2b1b5f98d6b330a8b97dcf3342
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master)

Bug: 309886715
Change-Id: I454616a38e3eba1c358da0056057b585416af68c
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
This commit is contained in:
Krishna Kurapati
2023-09-27 13:00:27 +05:30
committed by Treehugger Robot
parent 7a33209b36
commit a59b32866c
1 changed files with 15 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/usb/gadget/udc/core.c
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@@ -1098,12 +1098,12 @@ EXPORT_SYMBOL_GPL(usb_gadget_set_state);
/* ------------------------------------------------------------------------- */
/* Acquire connect_lock before calling this function. */
static void usb_udc_connect_control_locked(struct usb_udc *udc) __must_hold(&udc->connect_lock)
static int usb_udc_connect_control_locked(struct usb_udc *udc) __must_hold(&udc->connect_lock)
{
if (udc->vbus)
usb_gadget_connect_locked(udc->gadget);
return usb_gadget_connect_locked(udc->gadget);
else
usb_gadget_disconnect_locked(udc->gadget);
return usb_gadget_disconnect_locked(udc->gadget);
}
static void vbus_event_work(struct work_struct *work)
@@ -1577,12 +1577,23 @@ static int gadget_bind_driver(struct device *dev)
}
usb_gadget_enable_async_callbacks(udc);
udc->allow_connect = true;
usb_udc_connect_control_locked(udc);
ret = usb_udc_connect_control_locked(udc);
if (ret)
goto err_connect_control;
mutex_unlock(&udc->connect_lock);
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
return 0;
err_connect_control:
udc->allow_connect = false;
usb_gadget_disable_async_callbacks(udc);
if (gadget->irq)
synchronize_irq(gadget->irq);
usb_gadget_udc_stop_locked(udc);
mutex_unlock(&udc->connect_lock);
err_start:
driver->unbind(udc->gadget);