From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Fri, 5 Jun 2015 06:34:57 +0000 (+1000)
Subject: powerpc/iommu: Always release iommu_table in iommu_free_table()
X-Git-Tag: v4.14-rc1~5210^2~48
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8aca92d82d9f259e0b6b0c81e5eb9baaf471e6ad;p=platform%2Fkernel%2Flinux-rpi.git

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 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;
 	}