From: Okash Khawaja <okash.khawaja@gmail.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Samuel Thibault <samuel.thibault@ens-lyon.org>,
Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
William Hubbs <w.d.hubbs@gmail.com>,
Chris Brannon <chris@the-brannons.com>,
Kirk Reiser <kirk@reisers.ca>,
speakup@linux-speakup.org, devel@driverdev.osuosl.org
Subject: Re: [patch 1/3] tty: resolve tty contention between kernel and user space
Date: Sun, 9 Jul 2017 20:08:14 +0100 [thread overview]
Message-ID: <20170709190814.GA913@sanghar> (raw)
In-Reply-To: <CAHp75VdwWNj8PHRAMLqcQKhtT=sS5-n9T3n8GY1Rte=MKOQV-w@mail.gmail.com>
Hi,
On Sun, Jul 09, 2017 at 06:04:17PM +0300, Andy Shevchenko wrote:
> Above
> 1. take mutex
> 2. take reference
>
> Here:
> 1. give mutex back
> 2. give reference back
>
> I think we usually see symmetrical calls, i.e.
>
> 1. give reference back
> 2. give mutex back
>
> So, what did I miss?
After we hold the kref, driver won't disappear from underneath us so we
don't need tty_mutex just for decrementing the refcount.
Thanks,
Okash
next prev parent reply other threads:[~2017-07-09 19:08 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-07 20:28 tty contention resulting from tty_open_by_device export Okash Khawaja
2017-07-08 8:38 ` Greg Kroah-Hartman
2017-07-08 9:01 ` Okash Khawaja
2017-07-09 11:41 ` [patch 0/3] " Okash Khawaja
2017-07-09 11:41 ` [patch 1/3] tty: resolve tty contention between kernel and user space Okash Khawaja
2017-07-09 11:51 ` Greg Kroah-Hartman
2017-07-09 15:04 ` Andy Shevchenko
2017-07-09 19:08 ` Okash Khawaja [this message]
2017-07-10 8:31 ` Okash Khawaja
2017-07-10 15:21 ` Andy Shevchenko
2017-07-10 16:12 ` Okash Khawaja
2017-07-09 11:41 ` [patch 2/3] staging: speakup: use tty_kopen instead of tty_open_by_driver Okash Khawaja
2017-07-09 11:50 ` Greg Kroah-Hartman
2017-07-09 12:28 ` Okash Khawaja
2017-07-09 11:41 ` [patch 3/3] tty: undo export " Okash Khawaja
2017-07-09 11:57 ` [patch 0/3] Re: tty contention resulting from tty_open_by_device export Greg Kroah-Hartman
2017-07-09 12:32 ` [patch 4/3] tty: make tty_kopen return ENODEV in case of no TTY Okash Khawaja
2017-07-10 11:52 ` [patch 0/3] Re: tty contention resulting from tty_open_by_device export Alan Cox
2017-07-10 12:33 ` Okash Khawaja
2017-07-10 16:22 ` Okash Khawaja
2017-07-12 18:20 ` Alan Cox
2017-07-13 11:29 ` Okash Khawaja
2017-07-17 12:31 ` Greg Kroah-Hartman
2017-07-17 13:23 ` Okash Khawaja
2017-07-17 22:04 ` Alan Cox
2017-07-18 11:29 ` Okash Khawaja
2017-07-18 12:26 ` Dan Carpenter
2017-07-18 19:22 ` Okash Khawaja
2017-07-18 13:49 ` Alan Cox
2017-07-20 7:22 ` [patch v3 0/3] tty contention resulting from tty_open_by_driver export Okash Khawaja
2017-07-20 7:22 ` [patch v3 1/3] tty: resolve tty contention between kernel and user space Okash Khawaja
2017-07-20 7:22 ` [patch v3 2/3] staging: speakup: use tty_kopen and tty_kclose Okash Khawaja
2017-07-20 7:22 ` [patch v3 3/3] tty: undo export of tty_open_by_driver Okash Khawaja
2017-07-17 21:04 ` [patch v2 0/3] tty contention resulting from tty_open_by_driver export Okash Khawaja
2017-07-17 21:04 ` [patch v2 1/3] tty: resolve tty contention between kernel and user space Okash Khawaja
2017-07-17 21:04 ` [patch v2 2/3] staging: speakup: use tty_kopen instead of tty_open_by_driver Okash Khawaja
2017-07-17 21:04 ` [patch v2 3/3] tty: undo export " Okash Khawaja
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