[PATCH 08/28] mfd: nct6694: Do not resubmit interrupt URB on endpoint stall (-EPIPE)

[Lee Jones]

If the USB interrupt IN endpoint stalls (-EPIPE), usb_int_callback()
falls through to the default case and immediately resubmits the URB from
atomic completion context.  Because a stalled endpoint completes newly
submitted URBs immediately with -EPIPE, this triggers a tight infinite
resubmission loop.

Treat -EPIPE as a terminal URB status in usb_int_callback() alongside
the existing teardown status codes, matching other USB MFD drivers.

Fixes: 51dad33ede63 ("mfd: Add core driver for Nuvoton NCT6694")
Closes: https://sashiko.dev/#/bug/linux-9d8d1902-140d-4559-b604-76ba76e778a2
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
---
 drivers/mfd/nct6694.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mfd/nct6694.c b/drivers/mfd/nct6694.c
index e2957e587d1b..40a29f8e0ff6 100644
--- a/drivers/mfd/nct6694.c
+++ b/drivers/mfd/nct6694.c
@@ -201,6 +201,7 @@ static void usb_int_callback(struct urb *urb)
 		break;
 	case -ECONNRESET:
 	case -ENOENT:
+	case -EPIPE:
 	case -ESHUTDOWN:
 		return;
 	default:
-- 
2.56.0.218.g1ec904b173-goog