diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2016-12-07 01:16:27 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-27 09:09:34 +0200 |
| commit | 5693f3fb5a662ab0ab1f8ad3a0e13c820c4c47dc (patch) | |
| tree | ad30cdabad0dfcdedd5f5d38191d655feef4426e /drivers | |
| parent | 03e2fb9b5ce80aa9ff6384384f5fbde156550971 (diff) | |
hv: don't reset hv_context.tsc_page on crash
commit 56ef6718a1d8d77745033c5291e025ce18504159 upstream.
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 <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | 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 ddbf7e7e0d98..8ce1f2e22912 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -305,9 +305,10 @@ 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 } |