linux-kernel - Re: [PATCH 4.7 146/186] floppy: fix open(O

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Message-ID: <b0112987-3685-0660-9742-9124ec8b1ef7@fb.com>
Date:   Thu, 25 Aug 2016 08:41:26 -0600
From:   Jens Axboe <axboe@...com>
To:     <markh@...pro.net>, Jiri Kosina <jikos@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Wim Osterholt <wim@....tudelft.nl>
Subject: Re: [PATCH 4.7 146/186] floppy: fix open(O_ACCMODE) for ioctl-only
 open

On 08/25/2016 07:08 AM, Mark Hounschell wrote:
> On 08/24/2016 05:11 PM, Jiri Kosina wrote:
>> On Wed, 24 Aug 2016, Greg Kroah-Hartman wrote:
>>
>>>> I have a problem with this patch. It only fixes one of the regressions
>>>> caused by the original change to the floppy driver. It does not
>>>> address the
>>>> user land breakage of removing the NODELAY flag checks.
>>>
>>> Does the same problem also happen in Linus's tree?  If not, any hints on
>>> the patch that might have fixed it there?
>>
>
> Yes, it does. IMHO the entire patch (between 4.4 and 4.5 that broke user
> land multiple ways) should be reverted and a fix for what ever obscure
> BUG was supposed to be fixed should be "retried".
>
>> That's still an unresolved issue, and it's on my list to things to look
>> into.
>>
>> This particular patch though fixes a different issue, and should be
>> applied to -stable.
>>
>
> This patch fixes a bug that was introduced to fix "some other obscure
> BUG" that has nothing to do whatever with the "physical floppy" device.
> And it broke user land in at least 2 ways. All this patch does is revert
> part of the original patch so that it is only broke in 1 way to user
> land. It should revert the whole thing IMHO.

Which patch is this? If that is truly the case, it should be reverted
asap.

-- 
Jens Axboe