linux-kernel - Re: [PATCH 1/2] mpt3sas: Deallocate resources before trying reallocation of the same in _base_allocate_memory

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Date:	Wed, 17 Feb 2016 12:36:39 +0100
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Chaitra P B <chaitra.basappa@...adcom.com>
Cc:	JBottomley@...allels.com, jejb@...nel.org, hch@...radead.org,
	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,
	suganath-prabu.subramani@...adcom.com, sreekanth.reddy@...adcom.com
Subject: Re: [PATCH 1/2] mpt3sas: Deallocate resources before trying
 reallocation of the same in _base_allocate_memory_pools()

On Wed, Feb 17, 2016 at 04:55:25PM +0530, Chaitra P B wrote:
> Deallocates resources before reallocating of the same in retry_allocation
> path of _base_allocate_memory_pools()
> 
> Signed-off-by: Chaitra P B <chaitra.basappa@...adcom.com>
> Suganath prabu Subramani <suganath-prabu.subramani@...gotech.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_base.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
> index f59495b..60c2e86 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -3124,8 +3124,10 @@ _base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
>  		free_pages((ulong)ioc->scsi_lookup, ioc->scsi_lookup_pages);
>  		ioc->scsi_lookup = NULL;
>  	}
> -	kfree(ioc->hpr_lookup);
> -	kfree(ioc->internal_lookup);
> +	if (ioc->hpr_lookup)
> +		kfree(ioc->hpr_lookup);
> +	if (ioc->internal_lookup)
> +		kfree(ioc->internal_lookup);

kfree() can handle NULL pointers as arguments, so checking isn't needed. In
fact there are coccinelle scripts to check for it (make coccicheck) and it'll
spawn patches from people "fixing" it. So please get rid of the checks.

Otherwise

Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>

>  	if (ioc->chain_lookup) {
>  		for (i = 0; i < ioc->chain_depth; i++) {
>  			if (ioc->chain_lookup[i].chain_buffer)
> @@ -3360,6 +3362,7 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc,  int sleep_flag)
>  			goto out;
>  		retry_sz += 64;
>  		ioc->hba_queue_depth = max_request_credit - retry_sz;
> +		_base_release_memory_pools(ioc);
>  		goto retry_allocation;
>  	}
>  
> -- 
> 1.8.3.1
> 
> --
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-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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