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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Tue, 21 Apr 2009 00:42:12 +0000 (UTC)
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Subject: svn commit: r191345 - head/sys/dev/xl
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Author: yongari
Date: Tue Apr 21 00:42:11 2009
New Revision: 191345
URL: http://svn.freebsd.org/changeset/base/191345

Log:
  To make it easy whether xl(4) missed Tx completion interrupt check
  number of queued packets in watchdog timeout handler. If there are
  no queued packets just print a informational message and return
  without resetting controller. Also fix to invoke correct Tx
  completion handler as 3C905B needs different handler.

Modified:
  head/sys/dev/xl/if_xl.c

Modified: head/sys/dev/xl/if_xl.c
==============================================================================
--- head/sys/dev/xl/if_xl.c	Tue Apr 21 00:34:31 2009	(r191344)
+++ head/sys/dev/xl/if_xl.c	Tue Apr 21 00:42:11 2009	(r191345)
@@ -3211,12 +3211,31 @@ xl_watchdog(struct xl_softc *sc)
 {
 	struct ifnet		*ifp = sc->xl_ifp;
 	u_int16_t		status = 0;
+	int			misintr;
 
 	XL_LOCK_ASSERT(sc);
 
 	if (sc->xl_wdog_timer == 0 || --sc->xl_wdog_timer != 0)
 		return (0);
 
+	xl_rxeof(sc);
+	xl_txeoc(sc);
+	misintr = 0;
+	if (sc->xl_type == XL_TYPE_905B) {
+		xl_txeof_90xB(sc);
+		if (sc->xl_cdata.xl_tx_cnt == 0)
+			misintr++;
+	} else {
+		xl_txeof(sc);
+		if (sc->xl_cdata.xl_tx_head == NULL)
+			misintr++;
+	}
+	if (misintr != 0) {
+		device_printf(sc->xl_dev,
+		    "watchdog timeout (missed Tx interrupts) -- recovering\n");
+		return (0);
+	}
+
 	ifp->if_oerrors++;
 	XL_SEL_WIN(4);
 	status = CSR_READ_2(sc, XL_W4_MEDIA_STATUS);
@@ -3226,9 +3245,6 @@ xl_watchdog(struct xl_softc *sc)
 		device_printf(sc->xl_dev,
 		    "no carrier - transceiver cable problem?\n");
 
-	xl_txeoc(sc);
-	xl_txeof(sc);
-	xl_rxeof(sc);
 	xl_reset(sc);
 	xl_init_locked(sc);