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 17:40:49 +0100
From:	Tomas Henzl <thenzl@...hat.com>
To:	Johannes Thumshirn <jthumshirn@...e.de>,
	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 17.2.2016 12:36, Johannes Thumshirn wrote:
> 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;

Thanks for posting

Reviewed-by: Tomas Henzl <thenzl@...hat.com>