linux-kernel - Re: [PATCH] usb: gadget: f_fs: report error if excess data received

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Message-ID: <xa1t4m9ygngn.fsf@mina86.com>
Date:	Mon, 16 May 2016 15:08:08 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Alan Stern <stern@...land.harvard.edu>
Cc:	"Du\, Changbin" <changbin.du@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
	"rui.silva\@linaro.org" <rui.silva@...aro.org>,
	"k.opasiak\@samsung.com" <k.opasiak@...sung.com>,
	"lars\@metafoo.de" <lars@...afoo.de>,
	"linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: f_fs: report error if excess data received

> Alan Stern <stern@...land.harvard.edu> writes:
>> The point is that you don't know whether the host sent more data than
>> expected.  All you know is that the host sent more data than the user
>> asked the kernel for -- but maybe the user didn't ask for all the
>> data that he expected.  Maybe the user wanted to retrieve the full
>> set of data using two read() system calls.

On Mon, May 16 2016, Felipe Balbi wrote:
> right, but that just means we need to buffer the data instead of bailing
> out of the first read() completely.

Correct.

I have a ~4h bus ride ahead of me so I’ll try to implement it.  If you
don’t hear from me by the end of the day, there probably wasn’t enough
space/comfort in the bus to use a laptop.

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»