43 lines
1.6 KiB
Diff
43 lines
1.6 KiB
Diff
From c6c200e7836ff1b131442200096a8fd14c600165 Mon Sep 17 00:00:00 2001
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From: Kuen-Han Tsai <khtsai@google.com>
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Date: Thu, 7 Aug 2025 17:06:55 +0800
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Subject: usb: dwc3: Ignore late xferNotReady event to prevent halt timeout
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During a device-initiated disconnect, the End Transfer command resets
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the event filter, allowing a new xferNotReady event to be generated
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before the controller is fully halted. Processing this late event
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incorrectly triggers a Start Transfer, which prevents the controller
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from halting and results in a DSTS.DEVCTLHLT bit polling timeout.
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Ignore the late xferNotReady event if the controller is already in a
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disconnected state.
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Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
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Cc: stable <stable@kernel.org>
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Signed-off-by: Kuen-Han Tsai <khtsai@google.com>
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Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
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Link: https://lore.kernel.org/r/20250807090700.2397190-1-khtsai@google.com
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/dwc3/gadget.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/drivers/usb/dwc3/gadget.c
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+++ b/drivers/usb/dwc3/gadget.c
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@@ -3779,6 +3779,15 @@ static void dwc3_gadget_endpoint_transfe
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static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
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const struct dwc3_event_depevt *event)
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{
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+ /*
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+ * During a device-initiated disconnect, a late xferNotReady event can
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+ * be generated after the End Transfer command resets the event filter,
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+ * but before the controller is halted. Ignore it to prevent a new
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+ * transfer from starting.
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+ */
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+ if (!dep->dwc->connected)
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+ return;
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+
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dwc3_gadget_endpoint_frame_from_event(dep, event);
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/*
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