From 7a627558214664f0e071b2652fc37e4d7d3dce32 Mon Sep 17 00:00:00 2001 From: Ishizaki Kou Date: Mon, 9 Jul 2007 18:17:42 -0500 Subject: [PATCH] spidernet: improve interrupt handling 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 Signed-off-by: Linas Vepstas Signed-off-by: Jeff Garzik --- drivers/net/spider_net.c | 59 ++++++++++++++++++++++++++++++---------- 1 file changed, 45 insertions(+), 14 deletions(-) diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c index f5abb5279d4..590b12c7246 100644 --- a/drivers/net/spider_net.c +++ b/drivers/net/spider_net.c @@ -1441,11 +1441,17 @@ 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) @@ -1673,9 +1679,11 @@ 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; @@ -1716,6 +1724,38 @@ spider_net_poll_controller(struct net_device *netdev) } #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 @@ -1736,6 +1776,7 @@ spider_net_init_card(struct spider_net_card *card) spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4); + spider_net_disable_interrupts(card); } /** @@ -1823,14 +1864,6 @@ spider_net_enable_card(struct spider_net_card *card) 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); } @@ -2007,6 +2040,8 @@ spider_net_open(struct net_device *netdev) netif_carrier_on(netdev); netif_poll_enable(netdev); + spider_net_enable_interrupts(card); + return 0; register_int_failed: @@ -2179,11 +2214,7 @@ spider_net_stop(struct net_device *netdev) 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); -- 2.41.1