This is a note to let you know that I've just added the patch titled
usb: dwc3: gadget: Propagate core init errors to UDC during pullup
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc3-gadget-propagate-core-init-errors-to-udc-during-pullup.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c0aabed9cabe057309779a9e26fe86a113d24dad Mon Sep 17 00:00:00 2001
From: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
Date: Sun, 18 Jun 2023 17:39:49 +0530
Subject: usb: dwc3: gadget: Propagate core init errors to UDC during pullup
From: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
commit c0aabed9cabe057309779a9e26fe86a113d24dad upstream.
In scenarios where pullup relies on resume (get sync) to initialize
the controller and set the run stop bit, then core_init is followed by
gadget_resume which will eventually set run stop bit.
But in cases where the core_init fails, the return value is not sent
back to udc appropriately. So according to UDC the controller has
started but in reality we never set the run stop bit.
On systems like Android, there are uevents sent to HAL depending on
whether the configfs_bind / configfs_disconnect were invoked. In the
above mentioned scnenario, if the core init fails, the run stop won't
be set and the cable plug-out won't result in generation of any
disconnect event and userspace would never get any uevent regarding
cable plug out and we never call pullup(0) again. Furthermore none of
the next Plug-In/Plug-Out's would be known to configfs.
Return back the appropriate result to UDC to let the userspace/
configfs know that the pullup failed so they can take appropriate
action.
Fixes: 77adb8bdf422 ("usb: dwc3: gadget: Allow runtime suspend if UDC unbinded")
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Message-ID: <20230618120949.14868-1-quic_kriskura@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2077,7 +2077,9 @@ static int dwc3_gadget_pullup(struct usb
ret = pm_runtime_get_sync(dwc->dev);
if (!ret || ret < 0) {
pm_runtime_put(dwc->dev);
- return 0;
+ if (ret < 0)
+ pm_runtime_set_suspended(dwc->dev);
+ return ret;
}
if (dwc->pullups_connected == is_on) {
Patches currently in stable-queue which might be from quic_kriskura@xxxxxxxxxxx are
queue-5.4/usb-dwc3-gadget-propagate-core-init-errors-to-udc-during-pullup.patch
