[patch 24/26] sky2: workaround for lost IRQ

Greg KH
2007-07-31T04:41:22Z

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-stable review patch. If anyone has any objections, please let us know.

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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 file changed, 8 insertions(+), 1 deletion(-)

--- linux-2.6.21.6.orig/drivers/net/sky2.c
+++ linux-2.6.21.6/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)");

@@ -2433,6 +2433,13 @@ static int sky2_poll(struct net_device *

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);

--