Merge tag 'stable/for-linus-3.11-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen fixes from Konrad Rzeszutek Wilk:
 - Three fixes for ARM/ARM64 to either compile or not certain generic
   drivers
 - Fix for avoiding a potential deadlock when an user space event
   channel is destroyed.
 - Fix a workqueue resuming multiple times.

* tag 'stable/for-linus-3.11-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/tmem: do not allow XEN_TMEM on ARM64
  xen/evtchn: avoid a deadlock when unbinding an event channel
  xen/arm: enable PV control for ARM
  xen/arm64: Don't compile cpu hotplug
  xenbus: frontend resume cleanup

4 files changed, 21 insertions, 26 deletions

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 9e02d60a364b..23eae5cb69c2 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -145,7 +145,7 @@ config SWIOTLB_XEN
 
 config XEN_TMEM
         tristate
-        depends on !ARM
+        depends on !ARM && !ARM64
         default m if (CLEANCACHE || FRONTSWAP)
         help
           Shim to interface in-kernel Transcendent Memory hooks
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index eabd0ee1c2bc..14fe79d8634a 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -1,9 +1,8 @@
-ifneq ($(CONFIG_ARM),y)
-obj-y   += manage.o
+ifeq ($(filter y, $(CONFIG_ARM) $(CONFIG_ARM64)),)
 obj-$(CONFIG_HOTPLUG_CPU)               += cpu_hotplug.o
 endif
 obj-$(CONFIG_X86)                       += fallback.o
-obj-y   += grant-table.o features.o events.o balloon.o
+obj-y   += grant-table.o features.o events.o balloon.o manage.o
 obj-y   += xenbus/
 
 nostackp := $(call cc-option, -fno-stack-protector)
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 8feecf01d55c..b6165e047f48 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -379,18 +379,12 @@ static long evtchn_ioctl(struct file *file,
                 if (unbind.port >= NR_EVENT_CHANNELS)
                         break;
 
-                spin_lock_irq(&port_user_lock);
-
                 rc = -ENOTCONN;
-                if (get_port_user(unbind.port) != u) {
-                        spin_unlock_irq(&port_user_lock);
+                if (get_port_user(unbind.port) != u)
                         break;
-                }
 
                 disable_irq(irq_from_evtchn(unbind.port));
 
-                spin_unlock_irq(&port_user_lock);
-
                 evtchn_unbind_from_user(u, unbind.port);
 
                 rc = 0;
@@ -490,26 +484,15 @@ static int evtchn_release(struct inode *inode, struct file *filp)
         int i;
         struct per_user_data *u = filp->private_data;
 
-        spin_lock_irq(&port_user_lock);
-
-        free_page((unsigned long)u->ring);
-
         for (i = 0; i < NR_EVENT_CHANNELS; i++) {
                 if (get_port_user(i) != u)
                         continue;
 
                 disable_irq(irq_from_evtchn(i));
-        }
-
-        spin_unlock_irq(&port_user_lock);
-
-        for (i = 0; i < NR_EVENT_CHANNELS; i++) {
-                if (get_port_user(i) != u)
-                        continue;
-
                 evtchn_unbind_from_user(get_port_user(i), i);
         }
 
+        free_page((unsigned long)u->ring);
         kfree(u->name);
         kfree(u);
 
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c
index 6ed8a9df4472..34b20bfa4e8c 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -115,7 +115,6 @@ static int xenbus_frontend_dev_resume(struct device *dev)
                         return -EFAULT;
                 }
 
-                INIT_WORK(&xdev->work, xenbus_frontend_delayed_resume);
                 queue_work(xenbus_frontend_wq, &xdev->work);
 
                 return 0;
@@ -124,6 +123,16 @@ static int xenbus_frontend_dev_resume(struct device *dev)
         return xenbus_dev_resume(dev);
 }
 
+static int xenbus_frontend_dev_probe(struct device *dev)
+{
+        if (xen_store_domain_type == XS_LOCAL) {
+                struct xenbus_device *xdev = to_xenbus_device(dev);
+                INIT_WORK(&xdev->work, xenbus_frontend_delayed_resume);
+        }
+
+        return xenbus_dev_probe(dev);
+}
+
 static const struct dev_pm_ops xenbus_pm_ops = {
         .suspend        = xenbus_dev_suspend,
         .resume         = xenbus_frontend_dev_resume,
@@ -142,7 +151,7 @@ static struct xen_bus_type xenbus_frontend = {
                 .name           = "xen",
                 .match          = xenbus_match,
                 .uevent         = xenbus_uevent_frontend,
-                .probe          = xenbus_dev_probe,
+                .probe          = xenbus_frontend_dev_probe,
                 .remove         = xenbus_dev_remove,
                 .shutdown       = xenbus_dev_shutdown,
                 .dev_attrs      = xenbus_dev_attrs,
@@ -474,7 +483,11 @@ static int __init xenbus_probe_frontend_init(void)
 
         register_xenstore_notifier(&xenstore_notifier);
 
-        xenbus_frontend_wq = create_workqueue("xenbus_frontend");
+        if (xen_store_domain_type == XS_LOCAL) {
+                xenbus_frontend_wq = create_workqueue("xenbus_frontend");
+                if (!xenbus_frontend_wq)
+                        pr_warn("create xenbus frontend workqueue failed, S3 resume is likely to fail\n");
+        }
 
         return 0;
 }