Re: [PATCH 2/2] ia64: iosapic: fix kexec oops when iosapic wasremoved

From: Toshi Kani
Date: Wed Mar 06 2013 - 12:50:08 EST


On Mon, 2013-03-04 at 11:47 +0800, Hanjun Guo wrote:
> Ioapic hotplug was supported in IA64 code, but will lead to kexec oops
> when iosapic was removed. here is the code logic:
>
> iosapic_remove
> iosapic_free
> memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]))
> iosapic_lists[index].addr was set to 0;
>
> and then kexec a new kernel
> kexec_disable_iosapic
> iosapic_write(rte->iosapic,..)
> __iosapic_write(iosapic->addr, reg, val);
> addr was set to 0 when iosapic_remove, and oops happened
>
:
>
> With Tony and Toshi's advice, the patch removes the "rte" from rte_list
> when the iosapic was removed.
>
> Signed-off-by: Hanjun Guo <guohanjun@xxxxxxxxxx>
> Signed-off-by: Jianguo Wu <wujianguo@xxxxxxxxxx>
> ---
> arch/ia64/kernel/iosapic.c | 32 +++++++++++++++++++++++++++++++-
> 1 files changed, 31 insertions(+), 1 deletions(-)
>
> diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
> index a6e2f75..bc4a0f8 100644
> --- a/arch/ia64/kernel/iosapic.c
> +++ b/arch/ia64/kernel/iosapic.c
> @@ -1010,6 +1010,26 @@ iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
> return 0;
> }
>
> +static int
> +delete_rte_from_list(unsigned int irq, unsigned int gsi)

I'd prefer to have "iosapic" prefix to the func name, something like
iosapic_delete_rte(), but this is just my preference. Other than that,
the change looks good to me.

Acked-by: Toshi Kani <toshi.kani@xxxxxx>

Thanks,
-Toshi



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