On Fri, May 29, 2015 at 06:44:29PM +1000, Alexey Kardashevskiy wrote:
>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@xxxxxxxxx>
Reviewed-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
Thanks,
Gavin
>---
>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
>
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