[RESEND PATCH] vfio/virtio: Fix lock/unlock mismatch in virtiovf_read_device_context_chunk()

[Jinhui Guo]

virtiovf_read_device_context_chunk() takes migf->list_lock with
spin_lock() but releases it with spin_unlock_irq().  This mismatch
can incorrectly enable interrupts if they were already disabled
when the lock was acquired, leading to unbalanced IRQ state.

Fix by using spin_lock_irq() to match spin_unlock_irq().

Fixes: 0bbc82e4ec79 ("vfio/virtio: Add support for the basic live migration functionality")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jinhui Guo <guojinhui.liam@xxxxxxxxxxxxx>
---

Hi,

Sorry for the noise. Resent with "Cc: stable@xxxxxxxxxxxxxxx"";
no other changes.

Best regards,
Jinhui

 drivers/vfio/pci/virtio/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/virtio/migrate.c b/drivers/vfio/pci/virtio/migrate.c
index 35fa2d6ed611..9fc24788fc04 100644
--- a/drivers/vfio/pci/virtio/migrate.c
+++ b/drivers/vfio/pci/virtio/migrate.c
@@ -621,7 +621,7 @@ virtiovf_read_device_context_chunk(struct virtiovf_migration_file *migf,
 
 	buf->start_pos = buf->migf->max_pos;
 	migf->max_pos += buf->length;
-	spin_lock(&migf->list_lock);
+	spin_lock_irq(&migf->list_lock);
 	list_add_tail(&buf->buf_elm, &migf->buf_list);
 	spin_unlock_irq(&migf->list_lock);
 	return 0;
-- 
2.20.1