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net/ncsi: Improve HNCDSC AEN handler 

This improves AEN handler for Host Network Controller Driver Status
Change (HNCDSC):

   * The channel's lock should be hold when accessing its state.
   * Do failover when host driver isn't ready.
   * Configure channel when host driver becomes ready.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Gavin Shan 2016-10-20 11:45:52 +11:00 committed by David S. Miller
parent bbc7c01e95
commit 22d8aa93d7
1 changed files with 15 additions and 3 deletions
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18
net/ncsi/ncsi-aen.c
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@ -141,23 +141,35 @@ static int ncsi_aen_handler_hncdsc(struct ncsi_dev_priv *ndp,
return -ENODEV;
/* If the channel is active one, we need reconfigure it */
spin_lock_irqsave(&nc->lock, flags);
ncm = &nc->modes[NCSI_MODE_LINK];
hncdsc = (struct ncsi_aen_hncdsc_pkt *)h;
ncm->data[3] = ntohl(hncdsc->status);
if (!list_empty(&nc->link) ||
nc->state != NCSI_CHANNEL_ACTIVE ||
(ncm->data[3] & 0x1))
nc->state != NCSI_CHANNEL_ACTIVE) {
spin_unlock_irqrestore(&nc->lock, flags);
return 0;
}
if (ndp->flags & NCSI_DEV_HWA)
spin_unlock_irqrestore(&nc->lock, flags);
if (!(ndp->flags & NCSI_DEV_HWA) && !(ncm->data[3] & 0x1))
ndp->flags |= NCSI_DEV_RESHUFFLE;
/* If this channel is the active one and the link doesn't
* work, we have to choose another channel to be active one.
* The logic here is exactly similar to what we do when link
* is down on the active channel.
*
* On the other hand, we need configure it when host driver
* state on the active channel becomes ready.
*/
ncsi_stop_channel_monitor(nc);
spin_lock_irqsave(&nc->lock, flags);
nc->state = (ncm->data[3] & 0x1) ? NCSI_CHANNEL_INACTIVE :
NCSI_CHANNEL_ACTIVE;
spin_unlock_irqrestore(&nc->lock, flags);
spin_lock_irqsave(&ndp->lock, flags);
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);