linux-kernel - Re: [PATCH 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits

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Message-ID: <d5a31b82-4134-a7fb-1a51-446e32db2fd0@huawei.com>
Date:   Mon, 23 May 2022 07:53:47 +0100
From:   John Garry <john.garry@...wei.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <joro@...tes.org>, <will@...nel.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hch@....de>,
        <m.szyprowski@...sung.com>, <robin.murphy@....com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-ide@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linux-scsi@...r.kernel.org>, <liyihang6@...ilicon.com>,
        <chenxiang66@...ilicon.com>, <thunder.leizhen@...wei.com>
Subject: Re: [PATCH 3/4] scsi: core: Cap shost max_sectors according to DMA
 optimum mapping limits

On 21/05/2022 00:30, Damien Le Moal wrote:
>> diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
>> index f69b77cbf538..a3ae6345473b 100644
>> --- a/drivers/scsi/hosts.c
>> +++ b/drivers/scsi/hosts.c
>> @@ -225,6 +225,11 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
>>   	shost->cmd_per_lun = min_t(int, shost->cmd_per_lun,
>>   				   shost->can_queue);
>>   

Hi Damien,

>> +	if (dma_dev->dma_mask) {
>> +		shost->max_sectors = min_t(unsigned int, shost->max_sectors,
>> +				dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
>> +	}
> Nit: you could drop the curly brackets here.

Some people prefer this style - multi-line statements have curly 
brackets, while single-line statements conform to the official coding 
style (and don't use brackets).

I'll just stick with what we have unless there is a consensus to change.

Thanks,
John

> 
>> +
>>   	error = scsi_init_sense_cache(shost);
>>   	if (error)
>>   		goto fail;