[PATCH 4/5] hv: don't reset hv_context.tsc_page on crash

[kys]

From: Vitaly Kuznetsov 

It may happen that secondary CPUs are still alive and resetting
hv_context.tsc_page will cause a consequent crash in read_hv_clock_tsc()
as we don't check for it being not NULL there. It is safe as we're not
freeing this page anyways.

Signed-off-by: Vitaly Kuznetsov 
Signed-off-by: K. Y. Srinivasan 
Cc: 
---
 drivers/hv/hv.c |5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index c11393c..60f14c4 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -309,9 +309,10 @@ void hv_cleanup(bool crash)
 
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
-   if (!crash)
+   if (!crash) {
vfree(hv_context.tsc_page);
-   hv_context.tsc_page = NULL;
+   hv_context.tsc_page = NULL;
+   }
}
 #endif
 }
-- 
1.7.4.1

[PATCH 4/5] hv: don't reset hv_context.tsc_page on crash

[kys]

From: Vitaly Kuznetsov 

It may happen that secondary CPUs are still alive and resetting
hv_context.tsc_page will cause a consequent crash in read_hv_clock_tsc()
as we don't check for it being not NULL there. It is safe as we're not
freeing this page anyways.

Signed-off-by: Vitaly Kuznetsov 
Signed-off-by: K. Y. Srinivasan 
Cc: 
---
 drivers/hv/hv.c |5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index c11393c..60f14c4 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -309,9 +309,10 @@ void hv_cleanup(bool crash)
 
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
-   if (!crash)
+   if (!crash) {
vfree(hv_context.tsc_page);
-   hv_context.tsc_page = NULL;
+   hv_context.tsc_page = NULL;
+   }
}
 #endif
 }
-- 
1.7.4.1