netdev - Re: [PATCH] usbnet: prevent device rpm suspend in usbnet

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: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1478514745.2400.3.camel@suse.com>
Date:   Mon, 07 Nov 2016 11:32:25 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe
 function

On Fri, 2016-11-04 at 09:26 -0400, Alan Stern wrote:
> On Fri, 4 Nov 2016, Kai-Heng Feng wrote:
> 
> > Sometimes cdc_mbim failed to probe if runtime pm is enabled:
> > [    9.305626] cdc_mbim: probe of 2-2:1.12 failed with error -22
> > 
> > This can be solved by increase its pm usage counter.
> 
> This should not be needed.  The USB core increments the PM usage 
> counter of a device before probing its interfaces.

Indeed. Yet we have experimental evidence.

Kai-Heng Feng, could you please enable dynamic debugging
for 
drivers/usb/core/driver.c

so that we can see what is going on with the usage counters?

	Regards
		Oliver