Re: [PATCH v2] xen/irq: Propagate the error from init_one_desc_irq() in init_*_irq_data()

[Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>]

Hi Julien,

Julien Grall writes:

> From: Julien Grall <jgrall@amazon.com>
>
> init_one_desc_irq() can return an error if it is unable to allocate
> memory. While this is unlikely to happen during boot (called from
> init_{,local_}irq_data()), it is better to harden the code by
> propagting the return value.
>
> Spotted by coverity.
>
> CID: 106529
>
> Signed-off-by: Julien Grall <jgrall@amazon.com>
> Reviewed-by: Roger Paul Monné <roger.pau@citrix.com>

Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>

For ARM part, obviously.

>
> ---
>     Changes in v2:
>         - Add Roger's reviewed-by for x86
>         - Handle
> ---
>  xen/arch/arm/irq.c | 12 ++++++++++--
>  xen/arch/x86/irq.c |  7 ++++++-
>  2 files changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/xen/arch/arm/irq.c b/xen/arch/arm/irq.c
> index 3877657a5277..b71b099e6fa2 100644
> --- a/xen/arch/arm/irq.c
> +++ b/xen/arch/arm/irq.c
> @@ -88,7 +88,11 @@ static int __init init_irq_data(void)
>      for ( irq = NR_LOCAL_IRQS; irq < NR_IRQS; irq++ )
>      {
>          struct irq_desc *desc = irq_to_desc(irq);
> -        init_one_irq_desc(desc);
> +        int rc = init_one_irq_desc(desc);
> +
> +        if ( rc )
> +            return rc;
> +
>          desc->irq = irq;
>          desc->action  = NULL;
>      }
> @@ -105,7 +109,11 @@ static int init_local_irq_data(void)
>      for ( irq = 0; irq < NR_LOCAL_IRQS; irq++ )
>      {
>          struct irq_desc *desc = irq_to_desc(irq);
> -        init_one_irq_desc(desc);
> +        int rc = init_one_irq_desc(desc);
> +
> +        if ( rc )
> +            return rc;
> +
>          desc->irq = irq;
>          desc->action  = NULL;
>  
> diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
> index 45966947919e..3ebd684415ac 100644
> --- a/xen/arch/x86/irq.c
> +++ b/xen/arch/x86/irq.c
> @@ -428,9 +428,14 @@ int __init init_irq_data(void)
>  
>      for ( irq = 0; irq < nr_irqs_gsi; irq++ )
>      {
> +        int rc;
> +
>          desc = irq_to_desc(irq);
>          desc->irq = irq;
> -        init_one_irq_desc(desc);
> +
> +        rc = init_one_irq_desc(desc);
> +        if ( rc )
> +            return rc;
>      }
>      for ( ; irq < nr_irqs; irq++ )
>          irq_to_desc(irq)->irq = irq;


-- 
Volodymyr Babchuk at EPAM