Subject: Re: [PATCH] powerpc/85xx: Fix oops during MSI driver probe on MPC85xxMDS boards

From: Anton Vorontsov <[email-masked]>
Date: Mon, 18 Jan 2010 18:53:24 +0300

On Wed, Dec 16, 2009 at 01:58:09AM +0300, Anton Vorontsov wrote:
> MPC85xx chips report the wrong value in feature reporting register,
> and that causes the following oops:
> 
>  Unable to handle kernel paging request for data at address 0x00000c00
>  Faulting instruction address: 0xc0019294
>  Oops: Kernel access of bad area, sig: 11 [#1]
>  MPC8569 MDS
>  Modules linked in:
>  [...]
>  NIP [c0019294] mpic_set_irq_type+0x2f0/0x368
>  LR [c0019124] mpic_set_irq_type+0x180/0x368
>  Call Trace:
>  [ef851d60] [c0019124] mpic_set_irq_type+0x180/0x368 (unreliable)
>  [ef851d90] [c007958c] __irq_set_trigger+0x44/0xd4
>  [ef851db0] [c007b550] set_irq_type+0x40/0x7c
>  [ef851dc0] [c0004a60] irq_create_of_mapping+0xb4/0x114
>  [ef851df0] [c0004af0] irq_of_parse_and_map+0x30/0x40
>  [ef851e20] [c0405678] fsl_of_msi_probe+0x1a0/0x328
>  [ef851e60] [c02e6438] of_platform_device_probe+0x5c/0x84
>  [...]
> 
> This is because mpic_alloc() assigns wrong values to
> mpic->isu_{size,shift,mask}, and things eventually break when
> _mpic_irq_read() is trying to use them.
> 
> This patch fixes the issue by enabling MPIC_BROKEN_FRR_NIRQS quirk.
> 
> Signed-off-by: Anton Vorontsov <[email-masked]>
> ---

Kumar,

Did you miss this patch or it's just in a queue for review?

Thanks!

>  arch/powerpc/platforms/85xx/mpc85xx_mds.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/mpc85xx_mds.c b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> index c5028a2..6491f7c 100644
> --- a/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> +++ b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> @@ -338,7 +338,8 @@ static void __init mpc85xx_mds_pic_init(void)
>  	}
>  
>  	mpic = mpic_alloc(np, r.start,
> -			MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
> +			MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN |
> +			MPIC_BROKEN_FRR_NIRQS,
>  			0, 256, " OpenPIC  ");
>  	BUG_ON(mpic == NULL);
>  	of_node_put(np);
> -- 
> 1.6.3.3