sparc: Fix bus type probing for ESP and LE devices.

If there is a dummy "espdma" or "ledma" parent device above ESP scsi
or LE ethernet device nodes, we have to match the bus as SBUS.

Otherwise the address and size cell counts are wrong and we don't
calculate the final physical device resource values correctly at all.

Commit b132378b7c5b26adb61de0a1cedef3d4e67358c7 ("sparc: Fix handling
of LANCE and ESP parent nodes in of_device.c") was meant to fix this
problem, but that only influences the inner loop of
build_device_resources().  We need this logic to also kick in at the
beginning of build_device_resources() as well, when we make the first
attempt to determine the device's immediate parent bus type for 'reg'
property element extraction.

Based almost entirely upon a patch by Friedrich Oslage.

Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/of_device_32.c b/arch/sparc/kernel/of_device_32.c
index 0a83bd737654de487ec0ab1e857c278352438902..c8f14c1dc5214da6b99a781f0bc58d963e144fae 100644 (file)
--- a/arch/sparc/kernel/of_device_32.c
+++ b/arch/sparc/kernel/of_device_32.c
@@ -246,8 +246,25 @@ static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
 
 static int of_bus_sbus_match(struct device_node *np)
 {
-       return !strcmp(np->name, "sbus") ||
-               !strcmp(np->name, "sbi");
+       struct device_node *dp = np;
+
+       while (dp) {
+               if (!strcmp(dp->name, "sbus") ||
+                   !strcmp(dp->name, "sbi"))
+                       return 1;
+
+               /* Have a look at use_1to1_mapping().  We're trying
+                * to match SBUS if that's the top-level bus and we
+                * don't have some intervening real bus that provides
+                * ranges based translations.
+                */
+               if (of_find_property(dp, "ranges", NULL) != NULL)
+                       break;
+
+               dp = dp->parent;
+       }
+
+       return 0;
 }
 
 static void of_bus_sbus_count_cells(struct device_node *child,

diff --git a/arch/sparc/kernel/of_device_64.c b/arch/sparc/kernel/of_device_64.c
index 27381f1baffc256b8e321146c44c4efab828824e..5ac287ac03def46bd50d290467e76239dbfb9ef9 100644 (file)
--- a/arch/sparc/kernel/of_device_64.c
+++ b/arch/sparc/kernel/of_device_64.c
@@ -300,8 +300,25 @@ static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
 
 static int of_bus_sbus_match(struct device_node *np)
 {
-       return !strcmp(np->name, "sbus") ||
-               !strcmp(np->name, "sbi");
+       struct device_node *dp = np;
+
+       while (dp) {
+               if (!strcmp(dp->name, "sbus") ||
+                   !strcmp(dp->name, "sbi"))
+                       return 1;
+
+               /* Have a look at use_1to1_mapping().  We're trying
+                * to match SBUS if that's the top-level bus and we
+                * don't have some intervening real bus that provides
+                * ranges based translations.
+                */
+               if (of_find_property(dp, "ranges", NULL) != NULL)
+                       break;
+
+               dp = dp->parent;
+       }
+
+       return 0;
 }
 
 static void of_bus_sbus_count_cells(struct device_node *child,