From: Roman Kisel <rom...@linux.microsoft.com> Sent: Monday, July 14, 2025 3:16
PM
>
> It might happen that some hyp SynIC pages aren't allocated.
>
> Check for that and only then call iounmap().
>
> Signed-off-by: Roman Kisel <rom...@linux.microsoft.com>
> ---
> drivers/hv/hv.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
> index 820711e954d1..a8669843c56e 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -367,8 +367,10 @@ void hv_synic_disable_regs(unsigned int cpu)
> */
> simp.simp_enabled = 0;
> if (ms_hyperv.paravisor_present || hv_root_partition()) {
> - iounmap(hv_cpu->hyp_synic_message_page);
> - hv_cpu->hyp_synic_message_page = NULL;
> + if (hv_cpu->hyp_synic_message_page) {
> + iounmap(hv_cpu->hyp_synic_message_page);
> + hv_cpu->hyp_synic_message_page = NULL;
> + }
> } else {
> simp.base_simp_gpa = 0;
> }
> @@ -379,8 +381,10 @@ void hv_synic_disable_regs(unsigned int cpu)
> siefp.siefp_enabled = 0;
>
> if (ms_hyperv.paravisor_present || hv_root_partition()) {
> - iounmap(hv_cpu->hyp_synic_event_page);
> - hv_cpu->hyp_synic_event_page = NULL;
> + if (hv_cpu->hyp_synic_event_page) {
> + iounmap(hv_cpu->hyp_synic_event_page);
> + hv_cpu->hyp_synic_event_page = NULL;
> + }
> } else {
> siefp.base_siefp_gpa = 0;
> }
> --
> 2.43.0
Reviewed-by: Michael Kelley <mhkli...@outlook.com>
