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Re: [PATCH] MIPS: octeon: fix DT pruning bug with pip ports

To: Faidon Liambotis <>, Ralf Baechle <>
Subject: Re: [PATCH] MIPS: octeon: fix DT pruning bug with pip ports
From: David Daney <>
Date: Thu, 18 Jul 2013 10:45:21 -0700
Cc:, Aaro Koskinen <>
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On 07/11/2013 03:08 PM, Faidon Liambotis wrote:
During the pruning of the device tree octeon_fdt_pip_iface() is called
for each PIP interface and every port up to the port count is removed
from the device tree. However, the count was set to the return value of
cvmx_helper_interface_enumerate() which doesn't actually return the
count but just returns zero on success. This effectively removed *all*
ports from the tree.

Use cvmx_helper_ports_on_interface() instead to fix this. This
successfully restores the 3 ports of my ERLite-3 and fixes the "kernel
assigns random MAC addresses" issue.

Signed-off-by: Faidon Liambotis <>

Yes, this seems to be correct. It doesn't seem to break my ebt3000 board so...

Acked-by: David Daney <>

Ralf, please try to get it merged for 3.11, thanks.

  arch/mips/cavium-octeon/octeon-platform.c | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/mips/cavium-octeon/octeon-platform.c 
index 389512e..250eb20 100644
--- a/arch/mips/cavium-octeon/octeon-platform.c
+++ b/arch/mips/cavium-octeon/octeon-platform.c
@@ -334,9 +334,10 @@ static void __init octeon_fdt_pip_iface(int pip, int idx, 
u64 *pmac)
        char name_buffer[20];
        int iface;
        int p;
-       int count;
+       int count = 0;

-       count = cvmx_helper_interface_enumerate(idx);
+       if (cvmx_helper_interface_enumerate(idx) == 0)
+               count = cvmx_helper_ports_on_interface(idx);

        snprintf(name_buffer, sizeof(name_buffer), "interface@%d", idx);
        iface = fdt_subnode_offset(initial_boot_params, pip, name_buffer);

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