From: Greg KH <gregkh@linuxfoundation.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michal Nazarewicz <mina86@mina86.com>,
Robert Baldyga <r.baldyga@samsung.com>,
balbi@ti.com, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, andrzej.p@samsung.com
Subject: Re: [PATCH v2 2/3] usb: gadget: f_fs: add ioctl returning ep descriptor
Date: Sun, 27 Jul 2014 23:47:00 -0700 [thread overview]
Message-ID: <20140728064700.GA1284@kroah.com> (raw)
In-Reply-To: <53D5F0E4.1090500@samsung.com>
On Mon, Jul 28, 2014 at 08:42:44AM +0200, Marek Szyprowski wrote:
> Hello,
>
> On 2014-07-25 16:15, Michal Nazarewicz wrote:
> >On Fri, Jul 25 2014, Robert Baldyga wrote:
> >>This patch introduces ioctl named FUNCTIONFS_ENDPOINT_DESC, which
> >>returns endpoint descriptor to userspace. It works only if function
> >>is active.
> >I would argue that user space should never need to know the real
> >descriptor. Is this ioctl needed for anything in particular?
>
> Some proprietary broken usb protocols might embed real physical endpoint
> (or interface) number into the data stream. In such case functionfs driver
> is unable to do proper endpoint/interface number fixup.
Do you have an example of such a messed up thing?
greg k-h
next prev parent reply other threads:[~2014-07-28 6:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 13:36 [PATCH v2 0/3] usb: gadget: f_fs: userspace API fixes and improvements Robert Baldyga
2014-07-25 13:36 ` [PATCH v2 1/3] usb: gadget: f_fs: virtual address mapping Robert Baldyga
2014-07-25 14:18 ` Michal Nazarewicz
2014-07-28 5:52 ` Robert Baldyga
2014-07-28 10:22 ` Michal Nazarewicz
2014-07-28 11:52 ` Robert Baldyga
2014-07-28 15:21 ` Michal Nazarewicz
2014-07-29 6:12 ` Robert Baldyga
2014-07-25 13:36 ` [PATCH v2 2/3] usb: gadget: f_fs: add ioctl returning ep descriptor Robert Baldyga
2014-07-25 14:15 ` Michal Nazarewicz
2014-07-28 6:10 ` Robert Baldyga
2014-07-28 10:24 ` Michal Nazarewicz
2014-07-28 6:42 ` Marek Szyprowski
2014-07-28 6:47 ` Greg KH [this message]
2014-07-25 13:36 ` [PATCH v2 3/3] usb: gadget: f_fs: make numbers in ep file names the same as ep addresses Robert Baldyga
2014-07-25 14:14 ` Michal Nazarewicz
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