linux-kernel - [PATCH][REPOST] WAN: fix C101 card carrier handling

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Date:	Tue, 22 Aug 2006 14:59:17 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH][REPOST] WAN: fix C101 card carrier handling

Hi,

One of my recent changes broke C101 carrier handling, this patch
fixes it. Also fixes an old TX underrun checking bug.

2.6.18 material. Please apply.
Thanks.

Signed-off-by: Krzysztof Halasa <khc@...waw.pl>

diff --git a/drivers/net/wan/c101.c b/drivers/net/wan/c101.c
index 435e91e..6b63b35 100644
--- a/drivers/net/wan/c101.c
+++ b/drivers/net/wan/c101.c
@@ -118,7 +118,7 @@ #include "hd6457x.c"
 
 static inline void set_carrier(port_t *port)
 {
-	if (!sca_in(MSCI1_OFFSET + ST3, port) & ST3_DCD)
+	if (!(sca_in(MSCI1_OFFSET + ST3, port) & ST3_DCD))
 		netif_carrier_on(port_to_dev(port));
 	else
 		netif_carrier_off(port_to_dev(port));
@@ -127,10 +127,10 @@ static inline void set_carrier(port_t *p
 
 static void sca_msci_intr(port_t *port)
 {
-	u8 stat = sca_in(MSCI1_OFFSET + ST1, port); /* read MSCI ST1 status */
+	u8 stat = sca_in(MSCI0_OFFSET + ST1, port); /* read MSCI ST1 status */
 
-	/* Reset MSCI TX underrun status bit */
-	sca_out(stat & ST1_UDRN, MSCI0_OFFSET + ST1, port);
+	/* Reset MSCI TX underrun and CDCD (ignored) status bit */
+	sca_out(stat & (ST1_UDRN | ST1_CDCD), MSCI0_OFFSET + ST1, port);
 
 	if (stat & ST1_UDRN) {
 		struct net_device_stats *stats = hdlc_stats(port_to_dev(port));
@@ -138,6 +138,7 @@ static void sca_msci_intr(port_t *port)
 		stats->tx_fifo_errors++;
 	}
 
+	stat = sca_in(MSCI1_OFFSET + ST1, port); /* read MSCI1 ST1 status */
 	/* Reset MSCI CDCD status bit - uses ch#2 DCD input */
 	sca_out(stat & ST1_CDCD, MSCI1_OFFSET + ST1, port);
 
-
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