powerpc/iommu: Always release iommu_table in iommu_free_table()

At the moment iommu_free_table() only releases memory if
the table was initialized for the platform code use, i.e. it had
it_map initialized (which purpose is to track DMA memory space use).

With dynamic DMA windows, we will need to be able to release
iommu_table even if it was used for VFIO in which case it_map is NULL
so does the patch.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 3d47eb3e15dd906f00011447434d8692387f9ab6..73eb39a7a9e1972f807131bfb5e872ba16c0ad83 100644 (file)
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -713,9 +713,11 @@ void iommu_free_table(struct iommu_table *tbl, const char *node_name)
        unsigned long bitmap_sz;
        unsigned int order;
 
-       if (!tbl || !tbl->it_map) {
-               printk(KERN_ERR "%s: expected TCE map for %s\n", __func__,
-                               node_name);
+       if (!tbl)
+               return;
+
+       if (!tbl->it_map) {
+               kfree(tbl);
                return;
        }