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authorStanislaw Gruszka <sgruszka@redhat.com>2014-02-26 11:30:30 +0100
committerDavid Vrabel <david.vrabel@citrix.com>2014-03-18 14:40:20 +0000
commitcd979883b9ede90643e019f33cb317933eb867b4 (patch)
treee98a9654826b2396f7b01b65300c0a68946b9e33
parent1429d46df4c538d28460d0b493997006a62a1093 (diff)
downloadlinux-cd979883b9ede90643e019f33cb317933eb867b4.tar.bz2
xen/acpi-processor: fix enabling interrupts on syscore_resume
syscore->resume() callback is expected to do not enable interrupts, it generates warning like below otherwise: [ 9386.365390] WARNING: CPU: 0 PID: 6733 at drivers/base/syscore.c:104 syscore_resume+0x9a/0xe0() [ 9386.365403] Interrupts enabled after xen_acpi_processor_resume+0x0/0x34 [xen_acpi_processor] ... [ 9386.365429] Call Trace: [ 9386.365434] [<ffffffff81667a8b>] dump_stack+0x45/0x56 [ 9386.365437] [<ffffffff8106921d>] warn_slowpath_common+0x7d/0xa0 [ 9386.365439] [<ffffffff8106928c>] warn_slowpath_fmt+0x4c/0x50 [ 9386.365442] [<ffffffffa0261bb0>] ? xen_upload_processor_pm_data+0x300/0x300 [xen_acpi_processor] [ 9386.365443] [<ffffffff814055fa>] syscore_resume+0x9a/0xe0 [ 9386.365445] [<ffffffff810aef42>] suspend_devices_and_enter+0x402/0x470 [ 9386.365447] [<ffffffff810af128>] pm_suspend+0x178/0x260 On xen_acpi_processor_resume() we call various procedures, which are non atomic and can enable interrupts. To prevent the issue introduce separate resume notify called after we enable interrupts on resume and before we call other drivers resume callbacks. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
-rw-r--r--drivers/xen/manage.c16
-rw-r--r--drivers/xen/xen-acpi-processor.c15
-rw-r--r--include/xen/xen-ops.h4
3 files changed, 28 insertions, 7 deletions
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 624e8dc24532..fc6c94c0b436 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -46,6 +46,20 @@ struct suspend_info {
void (*post)(int cancelled);
};
+static RAW_NOTIFIER_HEAD(xen_resume_notifier);
+
+void xen_resume_notifier_register(struct notifier_block *nb)
+{
+ raw_notifier_chain_register(&xen_resume_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(xen_resume_notifier_register);
+
+void xen_resume_notifier_unregister(struct notifier_block *nb)
+{
+ raw_notifier_chain_unregister(&xen_resume_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(xen_resume_notifier_unregister);
+
#ifdef CONFIG_HIBERNATE_CALLBACKS
static void xen_hvm_post_suspend(int cancelled)
{
@@ -152,6 +166,8 @@ static void do_suspend(void)
err = stop_machine(xen_suspend, &si, cpumask_of(0));
+ raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);
+
dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
if (err) {
diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 7231859119f1..82358d14ecf1 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -27,10 +27,10 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
-#include <linux/syscore_ops.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
#include <xen/xen.h>
+#include <xen/xen-ops.h>
#include <xen/interface/platform.h>
#include <asm/xen/hypercall.h>
@@ -495,14 +495,15 @@ static int xen_upload_processor_pm_data(void)
return rc;
}
-static void xen_acpi_processor_resume(void)
+static int xen_acpi_processor_resume(struct notifier_block *nb,
+ unsigned long action, void *data)
{
bitmap_zero(acpi_ids_done, nr_acpi_bits);
- xen_upload_processor_pm_data();
+ return xen_upload_processor_pm_data();
}
-static struct syscore_ops xap_syscore_ops = {
- .resume = xen_acpi_processor_resume,
+struct notifier_block xen_acpi_processor_resume_nb = {
+ .notifier_call = xen_acpi_processor_resume,
};
static int __init xen_acpi_processor_init(void)
@@ -555,7 +556,7 @@ static int __init xen_acpi_processor_init(void)
if (rc)
goto err_unregister;
- register_syscore_ops(&xap_syscore_ops);
+ xen_resume_notifier_register(&xen_acpi_processor_resume_nb);
return 0;
err_unregister:
@@ -574,7 +575,7 @@ static void __exit xen_acpi_processor_exit(void)
{
int i;
- unregister_syscore_ops(&xap_syscore_ops);
+ xen_resume_notifier_unregister(&xen_acpi_processor_resume_nb);
kfree(acpi_ids_done);
kfree(acpi_id_present);
kfree(acpi_id_cst_present);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index fb2ea8f26552..2cf47175b12b 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -2,6 +2,7 @@
#define INCLUDE_XEN_OPS_H
#include <linux/percpu.h>
+#include <linux/notifier.h>
#include <asm/xen/interface.h>
DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
@@ -16,6 +17,9 @@ void xen_mm_unpin_all(void);
void xen_timer_resume(void);
void xen_arch_resume(void);
+void xen_resume_notifier_register(struct notifier_block *nb);
+void xen_resume_notifier_unregister(struct notifier_block *nb);
+
int xen_setup_shutdown_event(void);
extern unsigned long *xen_contiguous_bitmap;