linux-kernel - Re: [PATCH] usb: gadget: f

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Message-ID: <xa1tppe52swu.fsf@mina86.com>
Date:	Mon, 06 Oct 2014 16:07:29 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Robert Baldyga <r.baldyga@...sung.com>, balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, andrzej.p@...sung.com,
	k.opasiak@...sung.com
Subject: Re: [PATCH] usb: gadget: f_fs: add "zombie" mode

> On 10/06/2014 02:36 PM, Michal Nazarewicz wrote:
>> However, all the ep# files will still exist on the filesystem.  This may
>> be a bit confusing and error-prone, no?

On Mon, Oct 06 2014, Robert Baldyga <r.baldyga@...sung.com> wrote:
> Shouldn't be error-prone, because opening them will fail with -ENODEV,
> but indeed it can be confusing. I will try to do something about that

I could imagine someone will write shell script like so:

	ffs_active() {
		test -d "$1" || return 1
		set -- "$1"/ep*
		test $# -gt 1
	}

	if ffs_active /dev/foo-ffs; then
		# …
	fi

With such a script, non-functional ep# files in the functionfs mount
point, could lead to some errors in user-space.  I'm not saying that
this should block on any kind of changes to the way the filesystem works
when the function is inactive, but if possible, w/o a lot of additional
code, I'd rather if all the files disappeared in a zombie state.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@...gle.com>--<xmpp:mina86@...ber.org>--ooO--(_)--Ooo--
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