[PATCH v2] mshv: Fix interrupt state corruption in hv_do_map_pfns error path

[Stanislav Kinsburskii]

Restore interrupt state before breaking out of the loop on error.

The irq_flags are saved before entering the loop, but the early exit
path on error fails to restore them. This leaves interrupts in an
inconsistent state and can lead to lockdep warnings or other
interrupt-related issues.

Fixes: 621191d709b14 ("Drivers: hv: Introduce mshv_root module to expose 
/dev/mshv to VMMs")
Signed-off-by: Stanislav Kinsburskii <skinsburs...@linux.microsoft.com>
---
 drivers/hv/mshv_root_hv_call.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/mshv_root_hv_call.c b/drivers/hv/mshv_root_hv_call.c
index ab210a7fcb8c3..61291ec6f3468 100644
--- a/drivers/hv/mshv_root_hv_call.c
+++ b/drivers/hv/mshv_root_hv_call.c
@@ -229,8 +229,10 @@ static int hv_do_map_gpa_hcall(u64 partition_id, u64 gfn, 
u64 page_struct_count,
                        } else {
                                pfnlist[i] = mmio_spa + done + i;
                        }
-               if (ret)
+               if (ret) {
+                       local_irq_restore(irq_flags);
                        break;
+               }
 
                status = hv_do_rep_hypercall(HVCALL_MAP_GPA_PAGES, rep_count, 0,
                                             input_page, NULL);