[src/trunk]: src/sys/dev/pci Print and clear the wakeup status only when the ...

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

details:   https://anonhg.NetBSD.org/src/rev/f57a2fd53325
branches:  trunk
changeset: 446705:f57a2fd53325
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Sat Dec 15 05:40:10 2018 +0000

description:
Print and clear the wakeup status only when the WUS register != 0.

diffstat:

 sys/dev/pci/if_wm.c |  14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diffs (37 lines):

diff -r 5d71e6415ef9 -r f57a2fd53325 sys/dev/pci/if_wm.c
--- a/sys/dev/pci/if_wm.c       Sat Dec 15 05:38:45 2018 +0000
+++ b/sys/dev/pci/if_wm.c       Sat Dec 15 05:40:10 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_wm.c,v 1.604 2018/12/14 09:47:40 msaitoh Exp $      */
+/*     $NetBSD: if_wm.c,v 1.605 2018/12/15 05:40:10 msaitoh Exp $      */
 
 /*
  * Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -83,7 +83,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.604 2018/12/14 09:47:40 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.605 2018/12/15 05:40:10 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -3038,11 +3038,15 @@
 {
        struct wm_softc *sc = device_private(self);
        struct ifnet *ifp = &sc->sc_ethercom.ec_if;
+       pcireg_t reg;
        char buf[256];
 
-       snprintb(buf, sizeof(buf), WUS_FLAGS, CSR_READ(sc, WMREG_WUS));
-       device_printf(sc->sc_dev, "wakeup status %s\n", buf);
-       CSR_WRITE(sc, WMREG_WUS, 0xffffffff); /* W1C */
+       reg = CSR_READ(sc, WMREG_WUS);
+       if (reg != 0) {
+               snprintb(buf, sizeof(buf), WUS_FLAGS, reg);
+               device_printf(sc->sc_dev, "wakeup status %s\n", buf);
+               CSR_WRITE(sc, WMREG_WUS, 0xffffffff); /* W1C */
+       }
 
        if (sc->sc_type >= WM_T_PCH2)
                wm_resume_workarounds_pchlan(sc);