linux-kernel - Re: [PATCH V5] Save command pool address of Scsi

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Date:	Mon, 04 Aug 2014 14:01:04 +0200
From:	Juergen Gross <jgross@...e.com>
To:	Boaz Harrosh <openosd@...il.com>,
	James.Bottomley@...senPartnership.com, hch@...radead.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5] Save command pool address of Scsi_Host

On 08/04/2014 01:49 PM, Boaz Harrosh wrote:
> On 08/04/2014 02:30 PM, jgross@...e.com wrote:
>> From: Juergen Gross <jgross@...e.com>
>>
>> If a scsi host driver specifies .cmd_len in it's scsi_host_template, a driver's
>> private command pool is needed. scsi_find_host_cmd_pool() will locate it, but
>> scsi_alloc_host_cmd_pool() isn't saving the pool address in the host template.
>>
>> This will result in an access error when the host is removed.
>>
>> Avoid the problem by saving the address of a new allocated command pool where
>> it is expected.
>>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
>>   drivers/scsi/scsi.c | 12 ++++++++++--
>>   1 file changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
>> index 88d46fe..b0cef5b 100644
>> --- a/drivers/scsi/scsi.c
>> +++ b/drivers/scsi/scsi.c
>> @@ -380,6 +380,10 @@ scsi_alloc_host_cmd_pool(struct Scsi_Host *shost)
>>   		pool->slab_flags |= SLAB_CACHE_DMA;
>>   		pool->gfp_mask = __GFP_DMA;
>>   	}
>> +
>> +	if (hostt->cmd_size)
>> +		hostt->cmd_pool = pool;
>> +
>>   	return pool;
>>   }
>>
>> @@ -424,8 +428,10 @@ out:
>>   out_free_slab:
>>   	kmem_cache_destroy(pool->cmd_slab);
>>   out_free_pool:
>> -	if (hostt->cmd_size)
>> +	if (hostt->cmd_size) {
>>   		scsi_free_host_cmd_pool(pool);
>
> I disagree I liked the V4 version better. It is much nicer on the review
> that we NULL the same one we pass in with no need for context that's outside
> of this scope

:-)

I'm fine with either version.

Juergen

>
> Just my $0.017
> Boaz
>
>> +		hostt->cmd_pool = NULL;
>> +	}
>>   	goto out;
>>   }
>>
>> @@ -447,8 +453,10 @@ static void scsi_put_host_cmd_pool(struct Scsi_Host *shost)
>>   	if (!--pool->users) {
>>   		kmem_cache_destroy(pool->cmd_slab);
>>   		kmem_cache_destroy(pool->sense_slab);
>> -		if (hostt->cmd_size)
>> +		if (hostt->cmd_size) {
>>   			scsi_free_host_cmd_pool(pool);
>> +			hostt->cmd_pool = NULL;
>> +		}
>>   	}
>>   	mutex_unlock(&host_cmd_pool_mutex);
>>   }
>>
>
> --
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