This is a note to let you know that I've just added the patch titled
[PATCH 099/135] Drivers: hv: vmbus: don't manipulate with
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
0099-Drivers-hv-vmbus-don-t-manipulate-with-clocksources-.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6039340ca3dd6603715e81cbb9823fbc28a72574 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Date: Wed, 27 Jan 2016 22:29:36 -0800
Subject: [PATCH 099/135] Drivers: hv: vmbus: don't manipulate with
clocksources on crash
[ Upstream commit 3ccb4fd8f492f99aece21acc1bd6142275f26236 ]
clocksource_change_rating() involves mutex usage and can't be called
in interrupt context. It also makes sense to avoid doing redundant work
on crash.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -293,8 +293,14 @@ void hv_cleanup(void)
* Cleanup the TSC page based CS.
*/
if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
- clocksource_change_rating(&hyperv_cs_tsc, 10);
- clocksource_unregister(&hyperv_cs_tsc);
+ /*
+ * Crash can happen in an interrupt context and unregistering
+ * a clocksource is impossible and redundant in this case.
+ */
+ if (!oops_in_progress) {
+ clocksource_change_rating(&hyperv_cs_tsc, 10);
+ clocksource_unregister(&hyperv_cs_tsc);
+ }
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
Patches currently in stable-queue which might be from vkuznets@xxxxxxxxxx are
queue-4.4/0038-drivers-hv-cleanup-synic-msrs-if-vmbus-connect-faile.patch
queue-4.4/0097-Drivers-hv-vmbus-avoid-infinite-loop-in-init_vp_inde.patch
queue-4.4/0118-clocksource-Allow-unregistering-the-watchdog.patch
queue-4.4/0099-Drivers-hv-vmbus-don-t-manipulate-with-clocksources-.patch
queue-4.4/0127-x86-hyperv-Avoid-reporting-bogus-NMI-status-for-Gen2.patch
queue-4.4/0098-Drivers-hv-vmbus-avoid-scheduling-in-interrupt-conte.patch
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