linux-kernel - Re: [PATCH v6 1/3] scsi: ufs: add ioctl interface for query request

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Message-ID: <061dedf8cc074e798b8eca4871a080fa.squirrel@codeaurora.org>
Date:	Thu, 12 Mar 2015 15:27:46 -0000
From:	"Gilad Broner" <gbroner@...eaurora.org>
To:	"Akinobu Mita" <akinobu.mita@...il.com>
Cc:	"Gilad Broner" <gbroner@...eaurora.org>,
	"Jej B" <james.bottomley@...senpartnership.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org, "Santosh Y" <santoshsy@...il.com>,
	linux-scsi-owner@...r.kernel.org,
	"Subhash Jadavani" <subhashj@...eaurora.org>,
	"Yaniv Gardi" <ygardi@...eaurora.org>,
	"Dolev Raviv" <draviv@...eaurora.org>,
	"Noa Rubens" <noag@...eaurora.org>,
	"Raviv Shvili" <rshvili@...eaurora.org>,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...allels.com>,
	"open list:ABI/API" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] scsi: ufs: add ioctl interface for query request

>> +       if (!buffer) {
>> +               dev_err(hba->dev, "%s: User buffer is NULL!\n",
>> __func__);
>> +               return -EINVAL;
>> +       }
>> +
>
> Should we remove this check or move it into ufshcd_query_ioctl()?
> For example, BLKFLS ioctl without argument is correct usage, but
> it always triggers this message. (blkdev_ioctl -> __blkdev_driver_ioctl
> -> sd_ioctl -> scsi_ioctl -> ufshcd_ioctl)

You're right, I'll move the check to ufshcd_query_ioctl().

>  +++ b/include/uapi/scsi/ufs/ioctl.h
>> @@ -0,0 +1,57 @@
>> +#ifndef UAPI_UFS_IOCTL_H_
>> +#define UAPI_UFS_IOCTL_H_
>> +
>> +#include <linux/types.h>
>> +
>> +/*
>> + *  IOCTL opcode for ufs queries has the following opcode after
>> + *  SCSI_IOCTL_GET_PCI
>> + */
>> +#define UFS_IOCTL_QUERY                        0x5388
>
> Should we also need some comments near SCSI_IOCTL_GET_PCI in
> include/scsi/scsi.h in order to avoid someone trying to define
> the same ioctl code in the future?
>
Indeed - I will add a comment.

Gilad.

-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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