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Date:   Wed, 28 Sep 2022 14:50:01 +0100
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Subject: Re: [PATCH 1/6] scsi: libsas: Add sas_task_find_rq()
To:     Jason Yan <yanaijie@huawei.com>, <jejb@linux.ibm.com>,
        <martin.petersen@oracle.com>, <jinpu.wang@cloud.ionos.com>,
        <damien.lemoal@wdc.com>
CC:     <hare@suse.de>, <linux-scsi@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linuxarm@huawei.com>,
        <ipylypiv@google.com>, <changyuanl@google.com>, <hch@lst.de>
References: <1664368034-114991-1-git-send-email-john.garry@huawei.com>
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 <e47fe754-c8a7-99ff-88f2-8b09d98306ab@huawei.com>
From:   John Garry <john.garry@huawei.com>
In-Reply-To: <e47fe754-c8a7-99ff-88f2-8b09d98306ab@huawei.com>
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On 28/09/2022 14:13, Jason Yan wrote:
>> +++ b/include/scsi/libsas.h
>> @@ -644,6 +644,28 @@ static inline bool sas_is_internal_abort(struct 
>> sas_task *task)
>>       return task->task_proto == SAS_PROTOCOL_INTERNAL_ABORT;
>>   }
>> +static inline struct request *sas_task_find_rq(struct sas_task *task)
>> +{
>> +    struct scsi_cmnd *scmd;
>> +
>> +    if (!task || !task->uldd_task)
>> +        return NULL;
>> +
>> +    if (task->task_proto & SAS_PROTOCOL_STP_ALL) {
>> +        struct ata_queued_cmd *qc;
>> +
>> +        qc = task->uldd_task;
>> +        scmd = qc->scsicmd;
> 
> Can we remove that local qc?
>

We could...

> and
>      scmd = ((struct ata_queued_cmd *)task->uldd_task)->scsicmd;

... but I am not really sure that this is much better, specifically 
because of the casting from void. If you feel really strongly about it I 
could.

thanks,
John