linux-kernel - RE: [PATCH v5 4/8] char: rpmb: provide a user space interface

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Date:	Sun, 7 Aug 2016 09:44:03 +0000
From:	"Winkler, Tomas" <tomas.winkler@...el.com>
To:	Pavel Machek <pavel@....cz>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"Hunter, Adrian" <adrian.hunter@...el.com>,
	"James Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	Andy Lutomirski <luto@...nel.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	"Michael Ryleev" <gmar@...gle.com>,
	Joao Pinto <Joao.Pinto@...opsys.com>,
	"Christoph Hellwig" <hch@....de>,
	Yaniv Gardi <ygardi@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH v5 4/8] char: rpmb: provide a user space interface

> 
> On Mon 2016-07-18 23:27:49, Tomas Winkler wrote:
> > The user space API is achieved via two synchronous IOCTL.
> 
> IOCTLs?

Will fix
 
> > Simplified one, RPMB_IOC_REQ_CMD, were read result cycles is
> performed
> > by the framework on behalf the user and second, RPMB_IOC_SEQ_CMD
> where
> > the whole RPMB sequence including RESULT_READ is supplied by the caller.
> > The latter is intended for  easier adjusting  of the  applications
> > that use MMC_IOC_MULTI_CMD ioctl.
> 
> Why "  "?
Not sure I there is enough clue in your question. 
> 
> >
> > Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> 
> > +
> > +static long rpmb_ioctl(struct file *fp, unsigned int cmd, unsigned
> > +long arg) {
> > +	return __rpmb_ioctl(fp, cmd, (void __user *)arg); }
> > +
> > +#ifdef CONFIG_COMPAT
> > +static long rpmb_compat_ioctl(struct file *fp, unsigned int cmd,
> > +			      unsigned long arg)
> > +{
> > +	return	__rpmb_ioctl(fp, cmd, compat_ptr(arg));
> > +}
> > +#endif /* CONFIG_COMPAT */
> 
> Description of the ioctl is missing, 
Will add. 

and it should certainly be designed in a way
> that it does not need compat support.

The compat_ioctl handler just casts the compat_ptr, I believe this should be done unless the ioctl is globaly registered in fs/compat_ioctl.c, but I might be wrong.
Tomas