linux-kernel - [PATCH 5.12 092/296] xhci: fix giving back URB with incorrect status regression in 5.12

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Date:   Mon, 31 May 2021 15:12:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Peter Ganzhorn <peter.ganzhorn@...glemail.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 5.12 092/296] xhci: fix giving back URB with incorrect status regression in 5.12

From: Mathias Nyman <mathias.nyman@...ux.intel.com>

commit a80c203c3f1c06d2201c19ae071d0ae770a2b1ca upstream.

5.12 kernel changes how xhci handles cancelled URBs and halted
endpoints. Among these changes cancelled and stalled URBs are no longer
given back before they are cleared from xHC hardware cache.

These changes unfortunately cleared the -EPIPE status of a stalled
transfer in one case before giving bak the URB, causing a USB card reader
to fail from working.

Fixes: 674f8438c121 ("xhci: split handling halted endpoints into two steps")
Cc: <stable@...r.kernel.org> # 5.12
Reported-by: Peter Ganzhorn <peter.ganzhorn@...glemail.com>
Tested-by: Peter Ganzhorn <peter.ganzhorn@...glemail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Link: https://lore.kernel.org/r/20210525074100.1154090-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/host/xhci-ring.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -829,14 +829,10 @@ static void xhci_giveback_invalidated_td
 	list_for_each_entry_safe(td, tmp_td, &ep->cancelled_td_list,
 				 cancelled_td_list) {
 
-		/*
-		 * Doesn't matter what we pass for status, since the core will
-		 * just overwrite it (because the URB has been unlinked).
-		 */
 		ring = xhci_urb_to_transfer_ring(ep->xhci, td->urb);
 
 		if (td->cancel_status == TD_CLEARED)
-			xhci_td_cleanup(ep->xhci, td, ring, 0);
+			xhci_td_cleanup(ep->xhci, td, ring, td->status);
 
 		if (ep->xhci->xhc_state & XHCI_STATE_DYING)
 			return;