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authorJuergen Gross <jgross@suse.com>2016-09-22 11:06:25 +0200
committerDavid S. Miller <davem@davemloft.net>2016-09-22 08:26:24 -0400
commit0364a8824c020f12e2d5e9fad963685b58f7574e (patch)
tree42bc8abc5f8c7e1b243bed56bf309ff55ebbe144
parentf6f7d9c03f5daae04449ad19de5e2f0c20c5eaac (diff)
xen-netback: switch to threaded irq for control ring
Instead of open coding it use the threaded irq mechanism in xen-netback. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/xen-netback/common.h4
-rw-r--r--drivers/net/xen-netback/interface.c38
-rw-r--r--drivers/net/xen-netback/netback.c18
3 files changed, 11 insertions, 49 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 3a562683603c..ff94c513fe20 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -292,8 +292,6 @@ struct xenvif {
#endif
struct xen_netif_ctrl_back_ring ctrl;
- struct task_struct *ctrl_task;
- wait_queue_head_t ctrl_wq;
unsigned int ctrl_irq;
/* Miscellaneous private stuff. */
@@ -359,7 +357,7 @@ void xenvif_kick_thread(struct xenvif_queue *queue);
int xenvif_dealloc_kthread(void *data);
-int xenvif_ctrl_kthread(void *data);
+irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data);
void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb);
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 83deeebfc2d1..fb50c6d5f6c3 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -128,15 +128,6 @@ irqreturn_t xenvif_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-irqreturn_t xenvif_ctrl_interrupt(int irq, void *dev_id)
-{
- struct xenvif *vif = dev_id;
-
- wake_up(&vif->ctrl_wq);
-
- return IRQ_HANDLED;
-}
-
int xenvif_queue_stopped(struct xenvif_queue *queue)
{
struct net_device *dev = queue->vif->dev;
@@ -570,8 +561,7 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
struct net_device *dev = vif->dev;
void *addr;
struct xen_netif_ctrl_sring *shared;
- struct task_struct *task;
- int err = -ENOMEM;
+ int err;
err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
&ring_ref, 1, &addr);
@@ -581,11 +571,7 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
shared = (struct xen_netif_ctrl_sring *)addr;
BACK_RING_INIT(&vif->ctrl, shared, XEN_PAGE_SIZE);
- init_waitqueue_head(&vif->ctrl_wq);
-
- err = bind_interdomain_evtchn_to_irqhandler(vif->domid, evtchn,
- xenvif_ctrl_interrupt,
- 0, dev->name, vif);
+ err = bind_interdomain_evtchn_to_irq(vif->domid, evtchn);
if (err < 0)
goto err_unmap;
@@ -593,19 +579,13 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
xenvif_init_hash(vif);
- task = kthread_create(xenvif_ctrl_kthread, (void *)vif,
- "%s-control", dev->name);
- if (IS_ERR(task)) {
- pr_warn("Could not allocate kthread for %s\n", dev->name);
- err = PTR_ERR(task);
+ err = request_threaded_irq(vif->ctrl_irq, NULL, xenvif_ctrl_irq_fn,
+ IRQF_ONESHOT, "xen-netback-ctrl", vif);
+ if (err) {
+ pr_warn("Could not setup irq handler for %s\n", dev->name);
goto err_deinit;
}
- get_task_struct(task);
- vif->ctrl_task = task;
-
- wake_up_process(vif->ctrl_task);
-
return 0;
err_deinit:
@@ -774,12 +754,6 @@ void xenvif_disconnect_data(struct xenvif *vif)
void xenvif_disconnect_ctrl(struct xenvif *vif)
{
- if (vif->ctrl_task) {
- kthread_stop(vif->ctrl_task);
- put_task_struct(vif->ctrl_task);
- vif->ctrl_task = NULL;
- }
-
if (vif->ctrl_irq) {
xenvif_deinit_hash(vif);
unbind_from_irqhandler(vif->ctrl_irq, vif);
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index edbae0b1e8f0..3d0c989384b5 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -2359,24 +2359,14 @@ static bool xenvif_ctrl_work_todo(struct xenvif *vif)
return 0;
}
-int xenvif_ctrl_kthread(void *data)
+irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data)
{
struct xenvif *vif = data;
- for (;;) {
- wait_event_interruptible(vif->ctrl_wq,
- xenvif_ctrl_work_todo(vif) ||
- kthread_should_stop());
- if (kthread_should_stop())
- break;
-
- while (xenvif_ctrl_work_todo(vif))
- xenvif_ctrl_action(vif);
+ while (xenvif_ctrl_work_todo(vif))
+ xenvif_ctrl_action(vif);
- cond_resched();
- }
-
- return 0;
+ return IRQ_HANDLED;
}
static int __init netback_init(void)