linux-kernel - Re: USB: count of reading urbs

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Message-Id: <20060721221745.62349077.zaitcev@redhat.com>
Date:	Fri, 21 Jul 2006 22:17:45 -0700
From:	Pete Zaitcev <zaitcev@...hat.com>
To:	Sergej Pupykin <ps@...ltd.ru>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: USB: count of reading urbs

On 20 Jul 2006 16:43:23 +0400, Sergej Pupykin <ps@...ltd.ru> wrote:

> Please, tell me. If I submit one urb, can I lost data? (If data comes when
> urb callback executed)

USB by its nature requires devices to have some buffering, because
polling by the host may be irregular or not often enough. So, usually
there is no loss of data in such case. If you delay resubmissions
enough to overrun device's internal queue, it may happen.

-- Pete
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