From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ilya Zykov <ilya@ilyx.ru>
Cc: Andrew McGregor <andrew.mcgregor@alliedtelesis.co.nz>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alan Cox <alan@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: [PATCH] tty: Add driver unthrottle in ioctl(...,TCFLSH,..).
Date: Wed, 21 Nov 2012 21:30:37 +0000 [thread overview]
Message-ID: <20121121213037.154306da@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <50AD43DB.4030800@ilyx.ru>
> Function reset_buffer_flags() also invoked during the
> ioctl(...,TCFLSH,..). At the time of request we can have full buffers
> and throttled driver too. If we don't unthrottle driver, we can get
> forever throttled driver, because after request, we will have
> empty buffers and throttled driver and there is no place to unthrottle driver.
> It simple reproduce with "pty" pair then one side sleep on tty->write_wait,
> and other side do ioctl(...,TCFLSH,..). Then there is no place to do writers wake up.
So instead of revertng it why not just fix it ? Just add an argument to
the reset_buffer_flags function to indicate if unthrottling is permitted.
Alan
next prev parent reply other threads:[~2012-11-22 18:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-21 21:12 [PATCH] tty: Add driver unthrottle in ioctl(...,TCFLSH,..) Ilya Zykov
2012-11-21 21:30 ` Alan Cox [this message]
2012-11-21 21:39 ` Ilya Zykov
2012-11-22 0:47 ` andrew mcgregor
2012-11-22 4:29 ` Ilya Zykov
2012-11-22 5:25 ` andrew mcgregor
2012-11-22 6:35 ` Ilya Zykov
2012-11-22 6:03 ` Ilya Zykov
2012-11-22 6:16 ` Ilya Zykov
2012-11-21 21:55 ` Ilya Zykov
2012-11-27 6:14 [PATCH v4] " Ilya Zykov
2012-11-27 17:24 ` Greg Kroah-Hartman
2012-11-27 18:46 ` Ilya Zykov
2012-11-27 19:32 ` Alan Cox
2013-01-16 9:07 ` [PATCH] " Ilya Zykov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121121213037.154306da@pyramind.ukuu.org.uk \
--to=alan@lxorguk.ukuu.org.uk \
--cc=alan@linux.intel.com \
--cc=andrew.mcgregor@alliedtelesis.co.nz \
--cc=gregkh@linuxfoundation.org \
--cc=ilya@ilyx.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).