From: Sascha Hauer <s.hauer@pengutronix.de>
To: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 3/3] serial: Check result of console_unregister()
Date: Tue, 3 Apr 2018 09:04:27 +0200 [thread overview]
Message-ID: <20180403070427.terivivcpl2abuuf@pengutronix.de> (raw)
In-Reply-To: <20180326130915.8726-4-andrew.smirnov@gmail.com>
On Mon, Mar 26, 2018 at 06:09:15AM -0700, Andrey Smirnov wrote:
> In order to allow 'serdev' devices to prevent parent console device
> removal and correspondign memory deallocation add code to all serial
> driver to check result of console_unregister() and bail out early if
> it is unsuccessful.
>
> One example of a use-case for this would be a reset handler relying on
> a serdev device for transport. Without this patch underlying console
> device would be removed and de-allocated before reset handler is even
> run thus leading to unpredictable behaviour and crashes.
Can't we make this sure at driver core level? So if a device decides not
to return -EBUSY in the remove callback then the parent devices won't be
removed?
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
next prev parent reply other threads:[~2018-04-03 7:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-26 13:09 [PATCH 0/3] Linux's serdev framwork port Andrey Smirnov
2018-03-26 13:09 ` [PATCH 1/3] console: Introduce console_drain() Andrey Smirnov
2018-03-26 13:09 ` [PATCH 2/3] console: Add simplified 'serdev' framework from Linux kernel Andrey Smirnov
2018-04-03 6:54 ` Sascha Hauer
2018-04-09 16:40 ` Andrey Smirnov
2018-04-11 8:39 ` Sascha Hauer
2018-04-12 18:22 ` Andrey Smirnov
2018-03-26 13:09 ` [PATCH 3/3] serial: Check result of console_unregister() Andrey Smirnov
2018-04-03 7:04 ` Sascha Hauer [this message]
2018-04-09 16:00 ` Andrey Smirnov
2018-04-11 8:34 ` Sascha Hauer
2018-04-12 18:20 ` Andrey Smirnov
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=20180403070427.terivivcpl2abuuf@pengutronix.de \
--to=s.hauer@pengutronix.de \
--cc=andrew.smirnov@gmail.com \
--cc=barebox@lists.infradead.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