From: Oliver Neukum <oneukum@suse.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe function
Date: Mon, 07 Nov 2016 11:32:25 +0100 [thread overview]
Message-ID: <1478514745.2400.3.camel@suse.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1611040923110.6787-100000@netrider.rowland.org>
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
next prev parent reply other threads:[~2016-11-07 10:38 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-04 9:57 [PATCH] usbnet: prevent device rpm suspend in usbnet_probe function Kai-Heng Feng
2016-11-04 9:57 ` Kai-Heng Feng
2016-11-04 13:26 ` Alan Stern
2016-11-07 10:32 ` Oliver Neukum [this message]
2016-11-07 11:02 ` Oliver Neukum
2016-11-08 7:46 ` Kai-Heng Feng
2016-11-08 15:25 ` Alan Stern
2016-11-08 16:49 ` Bjørn Mork
2016-11-08 18:44 ` Alan Stern
2016-11-09 11:58 ` Oliver Neukum
2016-11-09 12:32 ` Bjørn Mork
2016-11-10 4:06 ` Kai-Heng Feng
2016-11-10 11:09 ` Bjørn Mork
2016-11-10 11:22 ` Oliver Neukum
2016-11-11 14:44 ` Mathias Nyman
2016-11-14 7:34 ` Kai-Heng Feng
2016-11-14 7:34 ` Kai-Heng Feng
2016-11-16 10:29 ` Kai-Heng Feng
2016-11-10 15:36 ` Alan Stern
2016-11-10 20:38 ` Bjørn Mork
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