[RFC PATCH kernel] vfio/spapr_tce: Get rid of possible infinite loop

[Alexey Kardashevskiy]

As a part of cleanup, the SPAPR TCE IOMMU subdriver releases preregistered
memory. If there is a bug in memory release, the loop in
tce_iommu_release() becomes infinite; this actually happened to me.

This makes the loop finite and prints a warning on every failure to make
the code more bug prone.

Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
 drivers/vfio/vfio_iommu_spapr_tce.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c 
b/drivers/vfio/vfio_iommu_spapr_tce.c
index b1a8ab3..ece0651 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -371,6 +371,7 @@ static void tce_iommu_release(void *iommu_data)
 {
        struct tce_container *container = iommu_data;
        struct tce_iommu_group *tcegrp;
+       struct tce_iommu_prereg *tcemem, *tmtmp;
        long i;
 
        while (tce_groups_attached(container)) {
@@ -393,13 +394,8 @@ static void tce_iommu_release(void *iommu_data)
                tce_iommu_free_table(container, tbl);
        }
 
-       while (!list_empty(&container->prereg_list)) {
-               struct tce_iommu_prereg *tcemem;
-
-               tcemem = list_first_entry(&container->prereg_list,
-                               struct tce_iommu_prereg, next);
-               WARN_ON_ONCE(tce_iommu_prereg_free(container, tcemem));
-       }
+       list_for_each_entry_safe(tcemem, tmtmp, &container->prereg_list, next)
+               WARN_ON(tce_iommu_prereg_free(container, tcemem));
 
        tce_iommu_disable(container);
        if (container->mm)
-- 
2.11.0