[PATCH] ARM: OMAP3+: fix oops triggered in omap_prcm_register_chain_handler

[t-kristo@ti.com (Tero Kristo)]

On Wed, 2012-03-21 at 12:49 +0800, Ming Lei wrote:
> This patch fixes the oos below:
> 
> [    1.790242] Unable to handle kernel NULL pointer dereference at virtual
> address 00000004
> [    1.798632] pgd = c0004000
> [    1.801638] [00000004] *pgd=00000000
> [    1.805400] Internal error: Oops: 805 [#1] PREEMPT SMP THUMB2
> [    1.811381] Modules linked in:
> [    1.814601] CPU: 1    Not tainted  (3.3.0-next-20120320+ #733)
> [    1.820683] PC is at irq_setup_generic_chip+0x6a/0x84
> [    1.825951] LR is at irq_get_irq_data+0x7/0x8
> [    1.830508] pc : [<c006465e>]    lr : [<c0063a03>]    psr: 20000133
> [    1.830512] sp : ee04ff58  ip : 00000000  fp : 00000000
> [    1.842461] r10: 00000000  r9 : 00000000  r8 : 00000800
> [    1.847905] r7 : c064e260  r6 : 000001dc  r5 : 00000001  r4 : ee0accc0
> [    1.854687] r3 : 00000002  r2 : 00000800  r1 : 000001dc  r0 : 00000000
> [    1.861472] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment kernel
> [    1.869234] Control: 50c5387d  Table: 8000404a  DAC: 00000015
> [    1.875215] Process swapper/0 (pid: 1, stack limit = 0xee04e2f8)
> [    1.881463] Stack: (0xee04ff58 to 0xee050000)
> [    1.886017] ff40: c061b668 00000008
> [    1.894497] ff60: c0682090 ee0accc0 00000003 c001c637 00000000 00000000 00000201 00000000
> [    1.902976] ff80: 00000004 c0473820 c0473800 c0459e8d c0680ac0 c000866d 00000004 00000004
> [    1.911455] ffa0: ee04ffa8 00000004 c047381c 00000004 c0473820 c0473800 c0680ac0 00000082
> [    1.919934] ffc0: c0489694 c045265f 00000004 00000004 c0452135 c000d105 00000033 00000000
> [    1.928413] ffe0: c04525b5 c000d111 00000033 00000000 00000000 c000d111 aaaaaaaa aaaaaaaa
> [    1.936912] [<c006465e>] (irq_setup_generic_chip+0x6a/0x84) from [<c001c637>] (omap_prcm_register_chain_handler+0x147/0x1a0)
> [    1.948516] [<c001c637>] (omap_prcm_register_chain_handler+0x147/0x1a0) from [<c000866d>] (do_one_initcall+0x65/0xf4)
> [    1.959500] [<c000866d>] (do_one_initcall+0x65/0xf4) from [<c045265f>] (kernel_init+0xab/0x138)
> [    1.968529] [<c045265f>] (kernel_init+0xab/0x138) from [<c000d111>] (kernel_thread_exit+0x1/0x6)
> [    1.977632] Code: f7ff f9d1 6b23 1af3 (6043) 086d
> [    1.982684] ---[ end trace 1b75b31a2719ed1c ]---
> [    1.987526] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> 
> Cc: Tero Kristo <t-kristo@ti.com>
> Signed-off-by: Ming Lei <tom.leiming@gmail.com>
> ---
>  arch/arm/mach-omap2/prm_common.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
> index 873b51d..d28f848 100644
> --- a/arch/arm/mach-omap2/prm_common.c
> +++ b/arch/arm/mach-omap2/prm_common.c
> @@ -290,7 +290,7 @@ int omap_prcm_register_chain_handler(struct omap_prcm_irq_setup *irq_setup)
>  		goto err;
>  	}
>  
> -	for (i = 0; i <= irq_setup->nr_regs; i++) {
> +	for (i = 0; i < irq_setup->nr_regs; i++) {
>  		gc = irq_alloc_generic_chip("PRCM", 1,
>  			irq_setup->base_irq + i * 32, prm_base,
>  			handle_level_irq);

Wow, I feel ashamed now. Best thing is it is correctly elsewhere in
code. :) You could probably write a better changelog for this but other
than that, acked.

-Tero