of: Fix size when dma-range is not used

Fix the dma-range size when the DT attribute is missing, i.e., set size to
dev->coherent_dma_mask + 1 instead of dev->coherent_dma_mask.  Also add
code to check invalid values of size configured in DT and log error.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>

1 files changed, 16 insertions, 1 deletions

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 31a7875b34a4..28e743888402 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -105,9 +105,24 @@ void of_dma_configure(struct device *dev, struct device_node *np)
         ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
         if (ret < 0) {
                 dma_addr = offset = 0;
-                size = dev->coherent_dma_mask;
+                size = dev->coherent_dma_mask + 1;
         } else {
                 offset = PFN_DOWN(paddr - dma_addr);
+
+                /*
+                 * Add a work around to treat the size as mask + 1 in case
+                 * it is defined in DT as a mask.
+                 */
+                if (size & 1) {
+                        dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
+                                 size);
+                        size = size + 1;
+                }
+
+                if (!size) {
+                        dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
+                        return;
+                }
                 dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
         }