lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 10 Jan 2024 13:46:31 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Mark Brown <broonie@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J . Wysocki" <rafael@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] regmap: debugfs: runtime resume a device when reading registers

Am Mittwoch, 10. Januar 2024, 13:23:17 CET schrieb Mark Brown:
> On Wed, Jan 10, 2024 at 10:53:58AM +0100, Alexander Stein wrote:
> > If the registers shall be read from device, runtime resume it in order
> > to enable a possiblly attached power domain before accessing the device.
> 
> The idea is that the debugfs interface isn't supposed to be disruptive
> to the thing being debugged.  It would be better to detect if there will
> be problems and report the status as busy.

In my case the device is actually unused, runtime suspended, thus disabled 
power domain. That's totally different to busy. In this case dumping the 
registers is non-disruptive, unless you account enabling/disabling the power 
domain as well. Any attached clock is already enabled/disabled, but power 
domains are not.

Best regards,
Alexander
-- 
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht München, HRB 105018
Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
http://www.tq-group.com/



Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ