linux-kernel - Re: [PATCH 2/3] serial: 8250_omap: check how many bytes were injected

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Message-ID: <55DDB89E.4000802@ti.com>
Date:	Wed, 26 Aug 2015 18:31:18 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Peter Hurley <peter@...leysoftware.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <john.ogness@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/3] serial: 8250_omap: check how many bytes were injected

On Wednesday 26 August 2015 06:14 PM, Peter Hurley wrote:
> On 08/14/2015 12:01 PM, Sebastian Andrzej Siewior wrote:
>> The function tty_insert_flip_string() returns an int and as such it
>> might fail. So the result is that I kindly asked to insert 48 bytes and
>> the function only insterted 32.
>> I have no idea what to do with the remaining 16 so I think dropping them
>> is the only option. I also increase the buf_overrun counter so userpace
>> has a clue that we lost bytes.
> 
> No objection to the patch but I'm curious whether this is something you've
> actually observed and under what circumstances.

This was observed while doing a UART internal loopback test at 3Mbaud on
TI's DRA7 EVM.

Thanks,
Sekhar

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