netdev - [PATCH 4/5] spidernet: fix error interrupt handling

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Date:	Fri, 11 Apr 2008 12:32:30 +0900 (JST)
From:	Ishizaki Kou <kou.ishizaki@...hiba.co.jp>
To:	jgarzik@...ox.com
Cc:	jens@...ibm.com, netdev@...r.kernel.org, cbe-oss-dev@...abs.org
Subject: [PATCH 4/5] spidernet: fix error interrupt handling

In addition to the value of GHIINT0STS, spidernet interrupt handler
should check the values of GHIINT1STS/GHIINT2STS registers at the
beginning of spider_net_interrupt() so as not to drop error
interrupts.

GHIINT1STS/GHIINT2STS registers indicates some of erroneous conditions
in spidernet, and a few bits of GHIINT0STS register reflects these
conditions. But GHIINT0MSK masks these bits, so you should check these
conditions by reading GHIINT1STS/GHIINT2STS registers directly.

Signed-off-by: Kou Ishizaki <kou.ishizaki@...hiba.co.jp>
Acked-by: Jens Osterkamp <jens@...ibm.com>
---

Index: linux-powerpc-git/drivers/net/spider_net.c
===================================================================
--- linux-powerpc-git.orig/drivers/net/spider_net.c
+++ linux-powerpc-git/drivers/net/spider_net.c
@@ -1415,18 +1415,12 @@ spider_net_link_reset(struct net_device 
  * found when an interrupt is presented
  */
 static void
-spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
+spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
+			    u32 error_reg1, u32 error_reg2)
 {
-	u32 error_reg1, error_reg2;
 	u32 i;
 	int show_error = 1;
 
-	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
-	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
-
-	error_reg1 &= SPIDER_NET_INT1_MASK_VALUE;
-	error_reg2 &= SPIDER_NET_INT2_MASK_VALUE;
-
 	/* check GHIINT0STS ************************************/
 	if (status_reg)
 		for (i = 0; i < 32; i++)
@@ -1656,12 +1650,15 @@ spider_net_interrupt(int irq, void *ptr)
 {
 	struct net_device *netdev = ptr;
 	struct spider_net_card *card = netdev_priv(netdev);
-	u32 status_reg;
+	u32 status_reg, error_reg1, error_reg2;
 
 	status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
-	status_reg &= SPIDER_NET_INT0_MASK_VALUE;
+	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
+	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
 
-	if (!status_reg)
+	if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
+	    !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
+	    !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
 		return IRQ_NONE;
 
 	if (status_reg & SPIDER_NET_RXINT ) {
@@ -1676,7 +1673,8 @@ spider_net_interrupt(int irq, void *ptr)
 		spider_net_link_reset(netdev);
 
 	if (status_reg & SPIDER_NET_ERRINT )
-		spider_net_handle_error_irq(card, status_reg);
+		spider_net_handle_error_irq(card, status_reg,
+					    error_reg1, error_reg2);
 
 	/* clear interrupt sources */
 	spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
--
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