[2.6.20.16 review 28/28] sky2: workaround for lost IRQ

[Willy Tarreau <w@1wt.eu>]

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This patch restores a couple of workarounds from 2.6.16:
 * restart transmit moderation timer in case it expires during IRQ routine
 * default to having 10 HZ watchdog timer.
At this point it more important not to hang than to worry about the
power cost.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/net/sky2.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 38e75cf..aec8c59 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -95,7 +95,7 @@ static int disable_msi = 0;
 module_param(disable_msi, int, 0);
 MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
 
-static int idle_timeout = 0;
+static int idle_timeout = 100;
 module_param(idle_timeout, int, 0);
 MODULE_PARM_DESC(idle_timeout, "Watchdog timer for lost interrupts (ms)");
 
@@ -2341,6 +2341,13 @@ static int sky2_poll(struct net_device *dev0, int *budget)
 
 	work_done = sky2_status_intr(hw, work_limit);
 	if (work_done < work_limit) {
+		/* Bug/Errata workaround?
+		 * Need to kick the TX irq moderation timer.
+		 */
+		if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
+			sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
+			sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
+		}
 		netif_rx_complete(dev0);
 
 		sky2_read32(hw, B0_Y2_SP_LISR);
-- 
1.5.2.4

--