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Message-ID: <20070709231742.GQ4457@austin.ibm.com>
Date: Mon, 9 Jul 2007 18:17:42 -0500
From: linas@...tin.ibm.com (Linas Vepstas)
To: Jeff Garzik <jgarzik@...ox.com>
Cc: netdev@...r.kernel.org, cbe-oss-dev@...abs.org,
Kou Ishizaki <kou.ishizaki@...hiba.co.jp>
Subject: [PATCH] spidernet: improve interrupt handling
From: Ishizaki Kou <kou.ishizaki@...hiba.co.jp>
We intend this patch to improve spidernet interrupt handling to be
more strict. We had following problem and this patch solves it.
-when CONFIG_DEBUG_SHIRQ=y, request_irq() calls handler().
-when spider_net_open() is called, it calls request_irq() which calls
spider_net_interrupt().
-if some specific interrupt bit is set at this timing, it calls
netif_rx_schedule() and spider_net_poll() is scheduled.
-spider_net_open() calls netif_poll_enable() which clears the bit
__LINK_STATE_RX_SCHED.
-when spider_net_poll() is called, it calls netif_rx_complete() which
causes BUG_ON() because __LINK_STATE_RX_SCHED is not set.
Signed-off-by: Kou Ishizaki <kou.ishizaki@...hiba.co.jp>
Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
----
Jeff, please apply for 2.6.23
Linas.
drivers/net/spider_net.c | 59 +++++++++++++++++++++++++++++++++++------------
1 file changed, 45 insertions(+), 14 deletions(-)
Index: linux-2.6.22-rc1/drivers/net/spider_net.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/net/spider_net.c 2007-06-14 17:23:32.000000000 -0500
+++ linux-2.6.22-rc1/drivers/net/spider_net.c 2007-07-09 14:10:04.000000000 -0500
@@ -1478,11 +1478,17 @@ static void
spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
{
u32 error_reg1, error_reg2;
+ u32 mask_reg1, mask_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);
+ mask_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1MSK);
+ mask_reg2 = spider_net_read_reg(card,SPIDER_NET_GHIINT2MSK);
+
+ error_reg1 &= mask_reg1;
+ error_reg2 &= mask_reg2;
/* check GHIINT0STS ************************************/
if (status_reg)
@@ -1710,9 +1716,11 @@ 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, mask_reg;
status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
+ mask_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0MSK);
+ status_reg &= mask_reg;
if (!status_reg)
return IRQ_NONE;
@@ -1754,6 +1762,38 @@ spider_net_poll_controller(struct net_de
#endif /* CONFIG_NET_POLL_CONTROLLER */
/**
+ * spider_net_enable_interrupts - enable interrupts
+ * @card: card structure
+ *
+ * spider_net_enable_interrupt enables several interrupts
+ */
+static void
+spider_net_enable_interrupts(struct spider_net_card *card)
+{
+ spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
+ SPIDER_NET_INT0_MASK_VALUE);
+ spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
+ SPIDER_NET_INT1_MASK_VALUE);
+ spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
+ SPIDER_NET_INT2_MASK_VALUE);
+}
+
+/**
+ * spider_net_disable_interrupts - disable interrupts
+ * @card: card structure
+ *
+ * spider_net_disable_interrupts disables all the interrupts
+ */
+static void
+spider_net_disable_interrupts(struct spider_net_card *card)
+{
+ spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
+ spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
+ spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
+ spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
+}
+
+/**
* spider_net_init_card - initializes the card
* @card: card structure
*
@@ -1773,6 +1813,7 @@ spider_net_init_card(struct spider_net_c
spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
+ spider_net_disable_interrupts(card);
}
/**
@@ -1860,14 +1901,6 @@ spider_net_enable_card(struct spider_net
spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
SPIDER_NET_OPMODE_VALUE);
- /* set interrupt mask registers */
- spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
- SPIDER_NET_INT0_MASK_VALUE);
- spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
- SPIDER_NET_INT1_MASK_VALUE);
- spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
- SPIDER_NET_INT2_MASK_VALUE);
-
spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
SPIDER_NET_GDTBSTA);
}
@@ -2044,6 +2077,8 @@ spider_net_open(struct net_device *netde
netif_carrier_on(netdev);
netif_poll_enable(netdev);
+ spider_net_enable_interrupts(card);
+
return 0;
register_int_failed:
@@ -2216,11 +2251,7 @@ spider_net_stop(struct net_device *netde
del_timer_sync(&card->tx_timer);
del_timer_sync(&card->aneg_timer);
- /* disable/mask all interrupts */
- spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
- spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
- spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
- spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
+ spider_net_disable_interrupts(card);
free_irq(netdev->irq, netdev);
-
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