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dcbnl : Disable software interrupts before taking dcb_lock 

Solves possible lockup issues that can be seen from firmware DCB agents calling
into the DCB app api.

DCB firmware event queues can be tied in with NAPI so that dcb events are
generated in softIRQ context. This can results in calls to dcb_*app()
functions which try to take the dcb_lock.

If the the event triggers while we also have the dcb_lock because lldpad or
some other agent happened to be issuing a  get/set command we could see a cpu
lockup.

This code was not originally written with firmware agents in mind, hence
grabbing dcb_lock from softIRQ context was not considered.

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anish Bhatt 2014-11-14 16:38:31 -08:00 committed by David S. Miller
parent 8c2dd54485
commit 52cff74eef
1 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
net/dcb/dcbnl.c
View File

@ -1080,13 +1080,13 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
if (!app) if (!app)
return -EMSGSIZE; return -EMSGSIZE;
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
list_for_each_entry(itr, &dcb_app_list, list) { list_for_each_entry(itr, &dcb_app_list, list) {
if (itr->ifindex == netdev->ifindex) { if (itr->ifindex == netdev->ifindex) {
err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app), err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app),
&itr->app); &itr->app);
if (err) { if (err) {
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
return -EMSGSIZE; return -EMSGSIZE;
} }
} }
@ -1097,7 +1097,7 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
else else
dcbx = -EOPNOTSUPP; dcbx = -EOPNOTSUPP;
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
nla_nest_end(skb, app); nla_nest_end(skb, app);
/* get peer info if available */ /* get peer info if available */
@ -1234,7 +1234,7 @@ static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
} }
/* local app */ /* local app */
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
app = nla_nest_start(skb, DCB_ATTR_CEE_APP_TABLE); app = nla_nest_start(skb, DCB_ATTR_CEE_APP_TABLE);
if (!app) if (!app)
goto dcb_unlock; goto dcb_unlock;
@ -1271,7 +1271,7 @@ static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
else else
dcbx = -EOPNOTSUPP; dcbx = -EOPNOTSUPP;
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
/* features flags */ /* features flags */
if (ops->getfeatcfg) { if (ops->getfeatcfg) {
@ -1326,7 +1326,7 @@ static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
return 0; return 0;
dcb_unlock: dcb_unlock:
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
nla_put_failure: nla_put_failure:
return err; return err;
} }
@ -1762,10 +1762,10 @@ u8 dcb_getapp(struct net_device *dev, struct dcb_app *app)
struct dcb_app_type *itr; struct dcb_app_type *itr;
u8 prio = 0; u8 prio = 0;
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
if ((itr = dcb_app_lookup(app, dev->ifindex, 0))) if ((itr = dcb_app_lookup(app, dev->ifindex, 0)))
prio = itr->app.priority; prio = itr->app.priority;
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
return prio; return prio;
} }
@ -1789,7 +1789,7 @@ int dcb_setapp(struct net_device *dev, struct dcb_app *new)
if (dev->dcbnl_ops->getdcbx) if (dev->dcbnl_ops->getdcbx)
event.dcbx = dev->dcbnl_ops->getdcbx(dev); event.dcbx = dev->dcbnl_ops->getdcbx(dev);
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
/* Search for existing match and replace */ /* Search for existing match and replace */
if ((itr = dcb_app_lookup(new, dev->ifindex, 0))) { if ((itr = dcb_app_lookup(new, dev->ifindex, 0))) {
if (new->priority) if (new->priority)
@ -1804,7 +1804,7 @@ int dcb_setapp(struct net_device *dev, struct dcb_app *new)
if (new->priority) if (new->priority)
err = dcb_app_add(new, dev->ifindex); err = dcb_app_add(new, dev->ifindex);
out: out:
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
if (!err) if (!err)
call_dcbevent_notifiers(DCB_APP_EVENT, &event); call_dcbevent_notifiers(DCB_APP_EVENT, &event);
return err; return err;
@ -1823,10 +1823,10 @@ u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app)
struct dcb_app_type *itr; struct dcb_app_type *itr;
u8 prio = 0; u8 prio = 0;
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
if ((itr = dcb_app_lookup(app, dev->ifindex, 0))) if ((itr = dcb_app_lookup(app, dev->ifindex, 0)))
prio |= 1 << itr->app.priority; prio |= 1 << itr->app.priority;
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
return prio; return prio;
} }
@ -1850,7 +1850,7 @@ int dcb_ieee_setapp(struct net_device *dev, struct dcb_app *new)
if (dev->dcbnl_ops->getdcbx) if (dev->dcbnl_ops->getdcbx)
event.dcbx = dev->dcbnl_ops->getdcbx(dev); event.dcbx = dev->dcbnl_ops->getdcbx(dev);
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
/* Search for existing match and abort if found */ /* Search for existing match and abort if found */
if (dcb_app_lookup(new, dev->ifindex, new->priority)) { if (dcb_app_lookup(new, dev->ifindex, new->priority)) {
err = -EEXIST; err = -EEXIST;
@ -1859,7 +1859,7 @@ int dcb_ieee_setapp(struct net_device *dev, struct dcb_app *new)
err = dcb_app_add(new, dev->ifindex); err = dcb_app_add(new, dev->ifindex);
out: out:
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
if (!err) if (!err)
call_dcbevent_notifiers(DCB_APP_EVENT, &event); call_dcbevent_notifiers(DCB_APP_EVENT, &event);
return err; return err;
@ -1882,7 +1882,7 @@ int dcb_ieee_delapp(struct net_device *dev, struct dcb_app *del)
if (dev->dcbnl_ops->getdcbx) if (dev->dcbnl_ops->getdcbx)
event.dcbx = dev->dcbnl_ops->getdcbx(dev); event.dcbx = dev->dcbnl_ops->getdcbx(dev);
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
/* Search for existing match and remove it. */ /* Search for existing match and remove it. */
if ((itr = dcb_app_lookup(del, dev->ifindex, del->priority))) { if ((itr = dcb_app_lookup(del, dev->ifindex, del->priority))) {
list_del(&itr->list); list_del(&itr->list);
@ -1890,7 +1890,7 @@ int dcb_ieee_delapp(struct net_device *dev, struct dcb_app *del)
err = 0; err = 0;
} }
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
if (!err) if (!err)
call_dcbevent_notifiers(DCB_APP_EVENT, &event); call_dcbevent_notifiers(DCB_APP_EVENT, &event);
return err; return err;
@ -1902,12 +1902,12 @@ static void dcb_flushapp(void)
struct dcb_app_type *app; struct dcb_app_type *app;
struct dcb_app_type *tmp; struct dcb_app_type *tmp;
spin_lock(&dcb_lock); spin_lock_bh(&dcb_lock);
list_for_each_entry_safe(app, tmp, &dcb_app_list, list) { list_for_each_entry_safe(app, tmp, &dcb_app_list, list) {
list_del(&app->list); list_del(&app->list);
kfree(app); kfree(app);
} }
spin_unlock(&dcb_lock); spin_unlock_bh(&dcb_lock);
} }
static int __init dcbnl_init(void) static int __init dcbnl_init(void)