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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-12-03 12:34:35 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-12-06 11:10:54 +0100
commit6ffc4b85358f6b7d252420cfa5862312cf5f83d8 (patch)
tree9bc986f48eda08bc03c8e7f54a29090c727748d5 /drivers/hv/hv.c
parentabd1026da4a7700a8db370947f75cd17b6ae6f76 (diff)
downloadlinux-6ffc4b85358f6b7d252420cfa5862312cf5f83d8.tar.bz2
hv: change clockevents unbind tactics
To get prepared to CPU offlining support we need co change the way how we unbind clockevent devices. As one CPU may go online/offline multiple times we need to bind it in hv_synic_init() and unbind it in hv_synic_cleanup(). There is an additional corner case: when we unload the module completely we need to switch to some other clockevent mechanism before stopping VMBus or we will hang. We can't call hv_synic_cleanup() before unloading VMBus as we won't be able to send UNLOAD request and get a response so hv_synic_clockevents_cleanup() has to live. Luckily, we can always call clockevents_unbind_device(), even if it wasn't bound before and there is no issue if we call it twice. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/hv.c')
-rw-r--r--drivers/hv/hv.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 60dbd6cb4640..446802ae8f1b 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -575,7 +575,7 @@ void hv_synic_clockevents_cleanup(void)
if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
return;
- for_each_online_cpu(cpu)
+ for_each_present_cpu(cpu)
clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
}
@@ -594,8 +594,10 @@ void hv_synic_cleanup(void *arg)
return;
/* Turn off clockevent device */
- if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
+ if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
+ clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
hv_ce_shutdown(hv_context.clk_evt[cpu]);
+ }
rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);