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gianfar: Fix boot hangs while bringing up gianfar ethernet

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Ira Snyder found that commit 8c7396aebb
"gianfar: Merge Tx and Rx interrupt for scheduling clean up ring" can
cause hangs. It's because there was removed clearing of interrupts in
gfar_schedule_cleanup() (which is called by an interrupt handler) in
case when netif scheduling has been disabled. This patch brings back
this action and a comment.

Reported-by: Ira Snyder <iws@ovro.caltech.edu>
Reported-by: Peter Korsgaard <jacmet@sunsite.dk>
Bisected-by: Ira Snyder <iws@ovro.caltech.edu>
Tested-by: Peter Korsgaard <jacmet@sunsite.dk>
Tested-by: Ira Snyder <iws@ovro.caltech.edu>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2009-02-09 14:59:30 -08:00 committed by David S. Miller
parent d4e2675a61
commit 8707bdd48a
1 changed files with 6 additions and 0 deletions
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6
drivers/net/gianfar.c
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@ -1629,6 +1629,12 @@ static void gfar_schedule_cleanup(struct net_device *dev)
if (netif_rx_schedule_prep(&priv->napi)) {
gfar_write(&priv->regs->imask, IMASK_RTX_DISABLED);
__netif_rx_schedule(&priv->napi);
} else {
/*
* Clear IEVENT, so interrupts aren't called again
* because of the packets that have already arrived.
*/
gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
}
spin_unlock(&priv->rxlock);