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Fixes:

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- 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.
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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
This commit is contained in:
Linus Torvalds 2013-07-31 11:37:43 -07:00
commit f66d95d69d
4 changed files with 21 additions and 26 deletions
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2
drivers/xen/Kconfig
View File

@ -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

5
drivers/xen/Makefile
View File

@ -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)

21
drivers/xen/evtchn.c
View File

@ -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);

19
drivers/xen/xenbus/xenbus_probe_frontend.c
View File

@ -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;
}