bus: mvebu-mbus: Fix optional pcie-mem/io-aperture properties

If the property was not specified then the returned resource had a
resource_size(..) == 1, rather than 0. The PCI-E driver checks for 0 so it
blindly continues on with a corrupted resource.

The regression was introduced into v3.12 by:

  11be654 PCI: mvebu: Adapt to the new device tree layout

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 553185318963939cc14c30d6fd9cfb9f898728b1..2394e9753ef56b47e93d91bd7499eeb657c51383 100644 (file)
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -865,11 +865,13 @@ static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
        int ret;
 
        /*
-        * These are optional, so we clear them and they'll
-        * be zero if they are missing from the DT.
+        * These are optional, so we make sure that resource_size(x) will
+        * return 0.
         */
        memset(mem, 0, sizeof(struct resource));
+       mem->end = -1;
        memset(io, 0, sizeof(struct resource));
+       io->end = -1;
 
        ret = of_property_read_u32_array(np, "pcie-mem-aperture", reg, ARRAY_SIZE(reg));
        if (!ret) {