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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: David Howells <dhowells@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	rstrode@redhat.com, swhiteho@redhat.com,
	nicolas.dichtel@6wind.com, raven@themaw.net,
	keyrings@vger.kernel.org, linux-usb@vger.kernel.org,
	linux-block <linux-block@vger.kernel.org>,
	Christian Brauner <christian@brauner.io>,
	LSM List <linux-security-module@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>
Subject: Re: Why add the general notification queue and its sources
Date: Thu, 5 Sep 2019 20:33:05 +0200
Message-ID: <20190905183305.GA22877@kroah.com> (raw)
In-Reply-To: <17703.1567702907@warthog.procyon.org.uk>

On Thu, Sep 05, 2019 at 06:01:47PM +0100, David Howells wrote:
>  (2) USB notifications.
> 
>      GregKH was looking for a way to do USB notifications as I was looking to
>      find additional sources to implement.  I'm not sure how he wants to use
>      them, but I'll let him speak to that himself.

We are getting people asking for all sorts of "error reporting" events
that can happen in the USB subsystem that we have started to abuse the
KOBJ_CHANGE uevent notification for.  At the same time your patches were
submitted, someone else submitted yet-another-USB-error patchset.  This
type of user/kernel interface is much easier to use than abusing uevents
for USB errors and general notifications about what happened with USB
devices (more than just add/remove that uevents have).

So yes, I would like this, and I am sure the ChromeOS people would like
it too given that I rejected their patcheset with the assumption that
this could be done with the notification queue api "soon" :)

thanks,

greg k-h

      parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04 22:15 [PATCH 00/11] Keyrings, Block and USB notifications [ver #8] David Howells
2019-09-04 22:15 ` [PATCH 01/11] uapi: General notification ring definitions " David Howells
2019-09-04 22:16 ` [PATCH 02/11] security: Add hooks to rule on setting a watch " David Howells
2019-09-04 22:16 ` [PATCH 03/11] security: Add a hook for the point of notification insertion " David Howells
2019-09-04 22:16 ` [PATCH 04/11] General notification queue with user mmap()'able ring buffer " David Howells
2019-09-04 22:16 ` [PATCH 05/11] keys: Add a notification facility " David Howells
2019-09-04 22:16 ` [PATCH 06/11] Add a general, global device notification watch list " David Howells
2019-09-04 22:16 ` [PATCH 07/11] block: Add block layer notifications " David Howells
2019-09-04 22:16 ` [PATCH 08/11] usb: Add USB subsystem " David Howells
2019-09-04 22:17 ` [PATCH 09/11] Add sample notification program " David Howells
2019-09-04 22:17 ` [PATCH 10/11] selinux: Implement the watch_key security hook " David Howells
2019-09-04 22:17 ` [PATCH 11/11] smack: Implement the watch_key and post_notification hooks " David Howells
2019-09-04 22:28 ` [PATCH 00/11] Keyrings, Block and USB notifications " Linus Torvalds
2019-09-05 17:01 ` Why add the general notification queue and its sources David Howells
2019-09-05 17:19   ` Linus Torvalds
2019-09-05 18:32     ` Ray Strode
2019-09-05 20:39       ` Linus Torvalds
2019-09-06 19:32         ` Ray Strode
2019-09-06 19:41           ` Ray Strode
2019-09-06 19:53           ` Robbie Harwood
2019-09-05 21:32       ` David Howells
2019-09-05 22:08         ` Linus Torvalds
2019-09-05 23:18         ` David Howells
2019-09-06  0:07           ` Linus Torvalds
2019-09-06 10:09           ` David Howells
2019-09-06 15:35             ` Linus Torvalds
2019-09-06 15:53               ` Linus Torvalds
2019-09-06 16:12                 ` Steven Whitehouse
2019-09-06 17:07                   ` Linus Torvalds
2019-09-06 17:14                     ` Linus Torvalds
2019-09-06 21:19                       ` David Howells
2019-09-06 17:14                   ` Andy Lutomirski
2019-09-05 18:37     ` Steven Whitehouse
2019-09-05 18:51       ` Ray Strode
2019-09-05 20:09         ` David Lehman
2019-09-05 18:33   ` Greg Kroah-Hartman [this message]

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