From: Alan Stern <stern@rowland.harvard.edu>
Date: Mon, 31 Jul 2006 14:16:24 +0000 (-0400)
Subject: USB: UHCI: Don't test the Short Packet Detect bit
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f443ddf1057776ed99d5006bbbefb018fcf7ce3a;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

USB: UHCI: Don't test the Short Packet Detect bit

Apparently some UHCI controllers change the value of the Short Packet
Detect (SPD) bit in the TD status word -- presumably when they receive a
short packet.  This patch (as759) changes uhci-hcd to avoid assuming
that the bit is unchanged; in fact, the driver no longer looks at SPD at
all.

This fixes the second problem reported in Bugzilla #6752.


Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index c9d72ac0a1d7..66c3f61bc9d1 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -943,7 +943,9 @@ static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
 			/* We received a short packet */
 			if (urb->transfer_flags & URB_SHORT_NOT_OK)
 				ret = -EREMOTEIO;
-			else if (ctrlstat & TD_CTRL_SPD)
+
+			/* Fixup needed only if this isn't the URB's last TD */
+			else if (&td->list != urbp->td_list.prev)
 				ret = 1;
 		}