[PATCH] 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 7ed623668c8ec..6381f949d9d91 100644
--- a/drivers/hv/mshv_root_hv_call.c
+++ b/drivers/hv/mshv_root_hv_call.c
@@ -237,8 +237,10 @@ static int hv_do_map_pfns(u64 partition_id, u64 gfn, u64 
pfns_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);