Re: [PATCH] MIPS: octeon: Fix warning in of_device_alloc on cn3xxx

[David Daney <ddaney@caviumnetworks.com>]

On 03/19/2014 03:03 PM, Andreas Herrmann wrote:
>
> Starting with commit 3da5278727a895d49a601f67fd49dffa0b80f9a5 (of/irq:
> Rework of_irq_count()) the following warning is triggered on octeon
> cn3xxx:
>
> [    0.887281] WARNING: CPU: 0 PID: 1 at drivers/of/platform.c:171 of_device_alloc+0x228/0x230()
> [    0.895642] Modules linked in:
> [    0.898689] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc7-00012-g9ae51f2-dirty #41
> [    0.906860] Stack : c8b439581166d96e ffffffff816b0000 0000000040808000 ffffffff81185ddc
> [    0.906860] 	  0000000000000000 0000000000000000 0000000000000000 000000000000000b
> [    0.906860] 	  000000000000000a 000000000000000a 0000000000000000 0000000000000000
> [    0.906860] 	  ffffffff81740000 ffffffff81720000 ffffffff81615900 ffffffff816b0177
> [    0.906860] 	  ffffffff81727d10 800000041f868fb0 0000000000000001 0000000000000000
> [    0.906860] 	  0000000000000000 0000000000000038 0000000000000001 ffffffff81568484
> [    0.906860] 	  800000041f86faa8 ffffffff81145ddc 0000000000000000 ffffffff811873f4
> [    0.906860] 	  800000041f868b88 800000041f86f9c0 0000000000000000 ffffffff81569c9c
> [    0.906860] 	  0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [    0.906860] 	  0000000000000000 ffffffff811205e0 0000000000000000 0000000000000000
> [    0.906860] 	  ...
> [    0.971695] Call Trace:
> [    0.974139] [<ffffffff811205e0>] show_stack+0x68/0x80
> [    0.979183] [<ffffffff81569c9c>] dump_stack+0x8c/0xe0
> [    0.984196] [<ffffffff81145efc>] warn_slowpath_common+0x84/0xb8
> [    0.990110] [<ffffffff81436888>] of_device_alloc+0x228/0x230
> [    0.995726] [<ffffffff814368d8>] of_platform_device_create_pdata+0x48/0xd0
> [    1.002593] [<ffffffff81436a94>] of_platform_bus_create+0x134/0x1e8
> [    1.008837] [<ffffffff81436af8>] of_platform_bus_create+0x198/0x1e8
> [    1.015064] [<ffffffff81436cc4>] of_platform_bus_probe+0xa4/0x100
> [    1.021149] [<ffffffff81100570>] do_one_initcall+0xd8/0x128
> [    1.026701] [<ffffffff816e2a10>] kernel_init_freeable+0x144/0x210
> [    1.032753] [<ffffffff81564bc4>] kernel_init+0x14/0x110
> [    1.037973] [<ffffffff8111bb44>] ret_from_kernel_thread+0x14/0x1c
>
> With this commit the kernel starts mapping the interrupts listed for
> gpio-controller node. irq_domain_ops for CIU (octeon_irq_ciu_map and
> octeon_irq_ciu_xlat) refuse to handle the GPIO lines (returning -EINVAL)
> and this is causing above warning in of_device_alloc().
>
> Modify irq_domain_ops for CIU and CIU2 to "gracefully handle" GPIO
> lines (neither return error code nor call octeon_irq_set_ciu_mapping
> for it). This should avoid the warning.
>
> (As before the real setup for GPIO lines will happen using
> irq_domain_ops of gpio-controller.)
>
> This patch is based on Wei's patch v2 (see
> http://marc.info/?l=linux-mips&m=139511814813247).
>
> Reported-by: Yang Wei <wei.yang@windriver.com>
> Cc: David Daney <david.daney@caviumnetworks.com>

Thanks Andreas and Yang Wei.

FWIW:

Tested and...

Acked-by: David Daney <david.daney@cavium.com>


Ralf et al.  If you are sending more patches for 3.14, this would be a 
good candidate.

Thanks,
David Daney

> Signed-off-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com>
> ---
>   arch/mips/cavium-octeon/octeon-irq.c |   22 ++++++++++++----------
>   1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
> index 25fbfae..c2bb4f8 100644
> --- a/arch/mips/cavium-octeon/octeon-irq.c
> +++ b/arch/mips/cavium-octeon/octeon-irq.c
[...]