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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>
This commit is contained in:
Alexey Kardashevskiy 2015-06-05 16:34:57 +10:00 committed by Michael Ellerman
parent ac9a58891a
commit 8aca92d82d
1 changed files with 5 additions and 3 deletions
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8
arch/powerpc/kernel/iommu.c
View File

@ -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;
}