iommu: Fix integer truncation

On 32-bit architectures, phys_addr_t may be different from dma_add_t,
both smaller and bigger. This can lead to an overflow during an assignment
that clang warns about:

drivers/iommu/dma-iommu.c:230:10: error: implicit conversion from 'dma_addr_t' (aka 'unsigned long long') to
      'phys_addr_t' (aka 'unsigned int') changes value from 18446744073709551615 to 4294967295 [-Werror,-Wconstant-conversion]

Use phys_addr_t here because that is the type that the variable was
declared as.

Fixes: aadad097cd46 ("iommu/dma: Reserve IOVA for PCIe inaccessible DMA address")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 129c4ba..749e325 100644 (file)
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -240,8 +240,8 @@ resv_iova:
                start = window->res->end - window->offset + 1;
                /* If window is last entry */
                if (window->node.next == &bridge->dma_ranges &&
-                   end != ~(dma_addr_t)0) {
-                       end = ~(dma_addr_t)0;
+                   end != ~(phys_addr_t)0) {
+                       end = ~(phys_addr_t)0;
                        goto resv_iova;
                }
        }