linux-kernel - Re: [mpt3sas driver 06/10] mpt3sas: Added smp_affinity

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Date:	Thu, 4 Feb 2016 16:01:09 +0100
From:	Tomas Henzl <thenzl@...hat.com>
To:	Suganath prabu Subaramani 
	<suganath-prabu.subramani@...gotech.com>, JBottomley@...allels.com,
	jejb@...nel.org, hch@...radead.org
Cc:	martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
	Sathya.Prakash@...gotech.com, kashyap.desai@...gotech.com,
	krishnaraddi.mankani@...gotech.com, linux-kernel@...r.kernel.org,
	chaitra.basappa@...gotech.com, sreekanth.reddy@...gotech.com
Subject: Re: [mpt3sas driver 06/10] mpt3sas: Added smp_affinity_enable module
 parameter.

On 28.1.2016 07:37, Suganath prabu Subaramani wrote:
> From: Suganath prabu Subramani <suganath-prabu.subramani@...gotech.com>
>
> Module parameter to enable/disable configuring
> affinity hint for msix vector.
> SMP affinity feature can be enabled/disabled by setting
> module parameter "smp_affinity_enable" to 1/0.
> By default this feature is enabled. (smp_affinity_enable = 1 enabled).
>
> Signed-off-by: Suganath prabu Subramani <suganath-prabu.subramani@...gotech.com>
> Signed-off-by: Chaitra P B <chaitra.basappa@...gotech.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_base.c | 34 +++++++++++++++++++++++-----------
>  1 file changed, 23 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
> index 31838d9a..a1a3b39 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -83,6 +83,10 @@ static int msix_disable = -1;
>  module_param(msix_disable, int, 0);
>  MODULE_PARM_DESC(msix_disable, " disable msix routed interrupts (default=0)");
>  
> +static int smp_affinity_enable = 1;
> +module_param(smp_affinity_enable, int, S_IRUGO);
> +MODULE_PARM_DESC(smp_affinity_enable, "SMP affinity feature enable/disbale Default: enable(1)");
> +
>  static int max_msix_vectors = -1;
>  module_param(max_msix_vectors, int, 0);
>  MODULE_PARM_DESC(max_msix_vectors,
> @@ -1812,8 +1816,10 @@ _base_free_irq(struct MPT3SAS_ADAPTER *ioc)
>  
>  	list_for_each_entry_safe(reply_q, next, &ioc->reply_queue_list, list) {
>  		list_del(&reply_q->list);
> -		irq_set_affinity_hint(reply_q->vector, NULL);
> -		free_cpumask_var(reply_q->affinity_hint);
> +		if (smp_affinity_enable) {
> +			irq_set_affinity_hint(reply_q->vector, NULL);
> +			free_cpumask_var(reply_q->affinity_hint);
> +		}
>  		synchronize_irq(reply_q->vector);
>  		free_irq(reply_q->vector, reply_q);
>  		kfree(reply_q);
> @@ -1844,9 +1850,11 @@ _base_request_irq(struct MPT3SAS_ADAPTER *ioc, u8 index, u32 vector)
>  	reply_q->msix_index = index;
>  	reply_q->vector = vector;
>  
> -	if (!alloc_cpumask_var(&reply_q->affinity_hint, GFP_KERNEL))
> -		return -ENOMEM;
> -	cpumask_clear(reply_q->affinity_hint);
> +	if (smp_affinity_enable) {
> +		if (!alloc_cpumask_var(&reply_q->affinity_hint, GFP_KERNEL))

a kfree(reply_q); should go here

> +			return -ENOMEM;
> +		cpumask_clear(reply_q->affinity_hint);

maybe zalloc_cpumask_var ?

> +	}

        if (r) {
                pr_err(MPT3SAS_FMT "unable to allocate interrupt %d!\n",
                    reply_q->name, vector);
                kfree(reply_q);
and a  free_cpumask_var (..)  here ?
                return -EBUSY;


cheers, 
tomash