lkml.org 
[lkml]   [2022]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] USB: Fix xhci ERDP update issue
On Thu, Mar 17, 2022 at 1:30 AM WeitaoWang-oc@zhaoxin.com
<WeitaoWang-oc@zhaoxin.com> wrote:
>
> On some situations, software handles TRB events slower than adding TRBs,
> xhci_irq will not exit until all events are handled. If xhci_irq just
> handles 256 TRBs and exit, the temp variable(event_ring_deq) driver
> records in xhci irq is equal to driver current dequeue pointer. It will
> cause driver not update ERDP and software dequeue pointer lost sync with
> ERDP. On the next xhci_irq, the event ring is full but driver will not
> update ERDP as software dequeue pointer 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
>
> Fixed this issue by update software record temp variable when handles
> 128 TRB events.
>
> Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.com>

Reviewed-by: Peter Chen <peter.chen@kernel.org>

> ---
> 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 d0b6806..f970799 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)
> --
> 2.7.4

\
 
 \ /
  Last update: 2022-03-17 02:57    [W:0.125 / U:0.196 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site