linux-kernel - [PATCH] USB: Fix xhci ERDP update issue

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Date:   Fri, 18 Mar 2022 20:17:50 +0800
From:   "WeitaoWang-oc@...oxin.com" <WeitaoWang-oc@...oxin.com>
To:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <hzpeterchen@...il.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <tonywwang@...oxin.com>, <weitaowang@...oxin.com>
Subject: [PATCH] USB: Fix xhci ERDP update issue

On some situations, software handles TRB events slower than adding TRBs.
If the number of TRB events to be processed in a given interrupt is 256.
The local variable "event_ring_deq" that records in interrupt handler
is equal to software_dequeue. It will cause driver not update ERDP,then
software dequeue pointer is out of sync with ERDP on interrupt exit.
On the next interrupt, the event ring may full but driver will not
update ERDP as software_dequeue is equal to ERDP.

[  536.377115] xhci_hcd 0000:00:12.0: ERROR unknown event type 37
[  566.933173] sd 8:0:0:0: [sdb] tag#27 uas_eh_abort_handler 0 uas-tag 7
inflight: CMD OUT
[  566.933181] sd 8:0:0:0: [sdb] tag#27 CDB: Write(10) 2a 00 17 71 e6 78
00 00 08 00
[  572.041186] xhci_hcd On some situataions,the0000:00:12.0: xHCI host
not responding to stop endpoint command.
[  572.057193] xhci_hcd 0000:00:12.0: Host halt failed, -110
[  572.057196] xhci_hcd 0000:00:12.0: xHCI host controller not
responding, assume dead
[  572.057236] sd 8:0:0:0: [sdb] tag#26 uas_eh_abort_handler 0 uas-tag 6
inflight: CMD
[  572.057240] sd 8:0:0:0: [sdb] tag#26 CDB: Write(10) 2a 00 38 eb cc d8
00 00 08 00
[  572.057244] sd 8:0:0:0: [sdb] tag#25 uas_eh_abort_handler 0 uas-tag 5
inflight: CMD

To avoid this issue by update software record local variable when
handles 128 TRB events.

Fixes: dc0ffbea5729 ("usb: host: xhci: update event ring dequeue pointer on purpose")
Signed-off-by: Weitao Wang <WeitaoWang-oc@...oxin.com>
---
  drivers/usb/host/xhci-ring.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index d0b6806275e0..f9707997969d 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3141,6 +3141,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
  		if (event_loop++ < TRBS_PER_SEGMENT / 2)
  			continue;
  		xhci_update_erst_dequeue(xhci, event_ring_deq);
+		event_ring_deq = xhci->event_ring->dequeue;

  		/* ring is half-full, force isoc trbs to interrupt more often */
  		if (xhci->isoc_bei_interval > AVOID_BEI_INTERVAL_MIN)
-- 
2.17.1