[PATCH kernel v12 05/34] powerpc/iommu: Always release iommu_table in iommu_free_table()

[Alexey Kardashevskiy]

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 at ozlabs.ru>
Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
Changes:
v11:
* fixed parameter checks
---
 arch/powerpc/kernel/iommu.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 3d47eb3..73eb39a 100644
--- 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;
 	}
 
-- 
2.4.0.rc3.8.gfb3e7d5