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Drivers: hv: Check message and event pages for non-NULL before iounmap()

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It might happen that some hyp SynIC pages aren't allocated.

Check for that and only then call iounmap().

Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Roman Kisel 2025-10-08 16:34:12 -07:00 committed by Wei Liu
parent 1bb15327d5
commit 09406f2f84
1 changed files with 8 additions and 4 deletions
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12
drivers/hv/hv.c
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@ -371,8 +371,10 @@ 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;
}
@ -383,8 +385,10 @@ 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;
}