linux-kernel - Re: [PATCH] mos7840: fix chars_in

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Message-ID: <5b55f2bb-8936-55bb-597d-68f073ea8620@list.ru>
Date:   Fri, 30 Sep 2016 00:00:30 +0300
From:   Stas Sergeev <stsp@...t.ru>
To:     Johan Hovold <johan@...nel.org>
Cc:     Caylan Van Larson <i@...lan.net>,
        Alan Cox <alan@...rguk.ukuu.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH] mos7840: fix chars_in_buffer() return value

29.09.2016 13:09, Johan Hovold пишет:
> On Sat, Sep 24, 2016 at 06:00:57PM +0300, Stas Sergeev wrote:
>> The TIOCOUTQ ioctl calls chars_in_buffer(), and some apps depend on
>> a correct behaviour of that.
>> mos7840 implements it wrongly: if you write just one char, TIOCOUTQ
>> will return 32.
>> This patch should fix it by accounting the number of chars actually
>> written.
>> This patch, unfortunately, misses the Tested-by tag.
>> The reporter didn't test it, and I don't have the hardware in question.
> Why do you think the driver returns 32b in chars_in_buffer after writing
> a single character?
Hi Johan, this actually came from this ancient bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=45791
I was trying to add you back then and now, but your e-mail
doesn't seem to be registered in a bug tracker.
The code in question was different when I submitted the
original patch:
https://bugzilla.kernel.org/attachment.cgi?id=77241
Maybe the bug was since fixed.
In that case sorry for the noise.