It is possible trigger below warning message from mass storage function,
WARNING: CPU: 6 PID: 3839 at drivers/usb/gadget/udc/core.c:294 usb_ep_queue+0x7c/0x104
pc : usb_ep_queue+0x7c/0x104
lr : fsg_main_thread+0x494/0x1b3c
Root cause is mass storage function try to queue request from main thread,
but other thread may already disable ep when function disable.
As there is no function failure in the driver, in order to avoid effort
to fix warning, change WARN_ON_ONCE() in usb_ep_queue() to pr_debug().
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: yuan linyu <yuanlinyu@xxxxxxxxxxx>
---
v4: add version info in subject
v3: add more debug info, remove two line commit description
https://lore.kernel.org/linux-usb/20240315015854.2715357-1-yuanlinyu@xxxxxxxxxxx/
v2: change WARN_ON_ONCE() in usb_ep_queue() to pr_debug()
https://lore.kernel.org/linux-usb/20240315013019.2711135-1-yuanlinyu@xxxxxxxxxxx/
v1: https://lore.kernel.org/linux-usb/20240314065949.2627778-1-yuanlinyu@xxxxxxxxxxx/
drivers/usb/gadget/udc/core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 9d4150124fdb..b3a9d18a8dcd 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -292,7 +292,9 @@ int usb_ep_queue(struct usb_ep *ep,
{
int ret = 0;
- if (WARN_ON_ONCE(!ep->enabled && ep->address)) {
+ if (!ep->enabled && ep->address) {
+ pr_debug("USB gadget: queue request to disabled ep 0x%x (%s)\n",
+ ep->address, ep->name);
ret = -ESHUTDOWN;
goto out;
}
--
2.25.1
