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authorJarek Poplawski <jarkao2@gmail.com>2009-02-09 14:59:30 -0800
committerDavid S. Miller <davem@davemloft.net>2009-02-09 14:59:30 -0800
commit8707bdd48ab705a459ac1b12014075a139d1d4f9 (patch)
tree1dc59924b30949d20a6f7c4da9981005b6d612f7
parentd4e2675a61890a84849a24affedf80d5cae8b199 (diff)
downloadblackbird-op-linux-8707bdd48ab705a459ac1b12014075a139d1d4f9.tar.gz
blackbird-op-linux-8707bdd48ab705a459ac1b12014075a139d1d4f9.zip
gianfar: Fix boot hangs while bringing up gianfar ethernet
Ira Snyder found that commit 8c7396aebb68994c0519e438eecdf4d5fa9c7844 "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>
-rw-r--r--drivers/net/gianfar.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index acae2d8cd688..9b12a13a640f 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -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);
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