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FROMLIST: amba: bus: Fix race condition during DMA configure at IOMMU… #950

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FROMLIST: amba: bus: Fix race condition during DMA configure at IOMMU… #950

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4 changes: 2 additions & 2 deletions drivers/amba/bus.c
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Original file line number Diff line number Diff line change
Expand Up @@ -353,7 +353,7 @@ static void amba_shutdown(struct device *dev)

static int amba_dma_configure(struct device *dev)
{
struct amba_driver *drv = to_amba_driver(dev->driver);
const struct device_driver *drv = READ_ONCE(dev->driver);
enum dev_dma_attr attr;
int ret = 0;

Expand All @@ -365,7 +365,7 @@ static int amba_dma_configure(struct device *dev)
}

/* @drv may not be valid when we're called from the IOMMU layer */
if (!ret && dev->driver && !drv->driver_managed_dma) {
if (!ret && drv && !to_amba_driver(drv)->driver_managed_dma) {
ret = iommu_device_use_default_domain(dev);
if (ret)
arch_teardown_dma_ops(dev);
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