From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: <gregkh@linuxfoundation.org>
Cc: <linux-usb@vger.kernel.org>,
pauldzim@gmail.com, Mathias Nyman <mathias.nyman@linux.intel.com>,
stable <stable@vger.kernel.org>
Subject: [PATCH v2 1/3] xhci: don't finish a TD if we get a short transfer event mid TD
Date: Mon, 12 Oct 2015 11:30:11 +0300 [thread overview]
Message-ID: <1444638613-10189-2-git-send-email-mathias.nyman@linux.intel.com> (raw)
In-Reply-To: <1444638613-10189-1-git-send-email-mathias.nyman@linux.intel.com>
If the difference is big enough between the bytes asked and received
in a bulk transfer we can get a short transfer event pointing to a TRB in
the middle of the TD. We don't want to handle the TD yet as we will anyway
receive a new event for the last TRB in the TD.
Hold off from finishing the TD and removing it from the list until we
receive an event for the last TRB in the TD
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
drivers/usb/host/xhci-ring.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 43291f9..79e89e6 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2191,6 +2191,10 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
}
/* Fast path - was this the last TRB in the TD for this URB? */
} else if (event_trb == td->last_trb) {
+ if (td->urb_length_set && trb_comp_code == COMP_SHORT_TX)
+ return finish_td(xhci, td, event_trb, event, ep,
+ status, false);
+
if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
td->urb->actual_length =
td->urb->transfer_buffer_length -
@@ -2242,6 +2246,12 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
td->urb->actual_length +=
TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+
+ if (trb_comp_code == COMP_SHORT_TX) {
+ xhci_dbg(xhci, "mid bulk/intr SP, wait for last TRB event\n");
+ td->urb_length_set = true;
+ return 0;
+ }
}
return finish_td(xhci, td, event_trb, event, ep, status, false);
--
1.9.1
next parent reply other threads:[~2015-10-12 8:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1444638613-10189-1-git-send-email-mathias.nyman@linux.intel.com>
2015-10-12 8:30 ` Mathias Nyman [this message]
2015-10-12 8:30 ` [PATCH v2 2/3] xhci: handle no ping response error properly Mathias Nyman
2015-10-12 8:30 ` [PATCH v2 3/3] Add spurious wakeup quirk for LynxPoint-LP controllers Mathias Nyman
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