[src/trunk]: src/sys/dev/usb Improve diagnostic print seen in PR 51524.

[dholland <dholland%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/87ee814516ce
branches:  trunk
changeset: 348058:87ee814516ce
user:      dholland <dholland%NetBSD.org@localhost>
date:      Mon Oct 03 00:32:37 2016 +0000

description:
Improve diagnostic print seen in PR 51524.

diffstat:

 sys/dev/usb/ehci.c |  11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diffs (32 lines):

diff -r da9f6c0741b6 -r 87ee814516ce sys/dev/usb/ehci.c
--- a/sys/dev/usb/ehci.c        Sun Oct 02 23:14:19 2016 +0000
+++ b/sys/dev/usb/ehci.c        Mon Oct 03 00:32:37 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ehci.c,v 1.253 2016/08/14 14:42:22 skrll Exp $ */
+/*     $NetBSD: ehci.c,v 1.254 2016/10/03 00:32:37 dholland Exp $ */
 
 /*
  * Copyright (c) 2004-2012 The NetBSD Foundation, Inc.
@@ -53,7 +53,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.253 2016/08/14 14:42:22 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.254 2016/10/03 00:32:37 dholland Exp $");
 
 #include "ohci.h"
 #include "uhci.h"
@@ -2168,8 +2168,11 @@
        DPRINTF("cmd = 0x%08x sts = 0x%08x ... done",
            EOREAD4(sc, EHCI_USBCMD), EOREAD4(sc, EHCI_USBSTS), 0, 0);
 #ifdef DIAGNOSTIC
-       if (error)
-               printf("ehci_sync_hc: cv_timedwait() = %d\n", error);
+       if (error == EWOULDBLOCK) {
+               printf("ehci_sync_hc: timed out\n");
+       } else if (error) {
+               printf("ehci_sync_hc: cv_timedwait: error %d\n", error);
+       }
 #endif
 }