From: Alan Stern <stern@rowland.harvard.edu>
To: Qais Yousef <qais.yousef@arm.com>
Cc: Oliver Neukum <oneukum@suse.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
<linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: lockdep warning in urb.c:363 usb_submit_urb
Date: Tue, 24 Mar 2020 09:52:12 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.2003240949180.4640-100000@netrider.rowland.org> (raw)
In-Reply-To: <20200324134353.eamiridhnjrmirgt@e107158-lin>
On Tue, 24 Mar 2020, Qais Yousef wrote:
> On 03/24/20 14:20, Oliver Neukum wrote:
> > Am Dienstag, den 24.03.2020, 10:46 +0000 schrieb Qais Yousef:
> > >
> > > I should have stuck to what I know then. I misread the documentation. Hopefully
> > > the attached looks better. I don't see the new debug you added emitted.
> >
> > That is odd. Please try
> >
> > echo "module usbcore +mfp" > /sys/kernel/debug/dynamic_debug/control
> >
> > with the attached improved patch.
>
> Hmm still no luck
>
>
> # history
> 0 echo "module usbcore +mfp" > /sys/kernel/debug/dynamic_debug/control
> 1 swapoff -a
> 2 echo suspend > /sys/power/disk
> 3 echo disk > /sys/power/state
> 4 dmesg > usb.dmesg
What happens if you omit step 1 (the swapoff)?
> $ git log -p
> commit dfd1731f9a3e7592135d2a6b2a5c5e1640a7eea4 (HEAD)
> Author: Oliver Neukum <oneukum@suse.com>
> Date: Mon Mar 23 16:34:35 2020 +0100
>
> usb: hub additional debugging
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 54cd8ef795ec..12ce2fdc4c2a 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1629,6 +1629,7 @@ static int hub_configure(struct usb_hub *hub,
> ret = -ENOMEM;
> goto fail;
> }
> + dev_dbg(hub_dev, "%p URB allocated \n", hub->urb);
>
> usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
> hub, endpoint->bInterval);
Oliver, by the way, %p isn't a good way to get pointer values for
debugging. Its output depends on how the system is configured. Use
%px instead (see Documentation/core-api/printk-formats.rst).
Alan Stern
next prev parent reply other threads:[~2020-03-24 13:52 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 14:38 lockdep warning in urb.c:363 usb_submit_urb Qais Yousef
2020-03-23 15:36 ` Oliver Neukum
2020-03-23 15:54 ` Alan Stern
2020-03-23 16:02 ` Qais Yousef
2020-03-23 16:18 ` Oliver Neukum
2020-03-23 15:57 ` Qais Yousef
2020-03-23 16:20 ` Oliver Neukum
2020-03-23 17:29 ` Qais Yousef
2020-03-24 9:08 ` Oliver Neukum
2020-03-24 10:46 ` Qais Yousef
2020-03-24 13:20 ` Oliver Neukum
2020-03-24 13:43 ` Qais Yousef
2020-03-24 13:52 ` Alan Stern [this message]
2020-03-24 14:06 ` Qais Yousef
2020-03-24 15:56 ` Alan Stern
2020-03-24 17:22 ` Qais Yousef
2020-03-24 19:22 ` Alan Stern
2020-03-25 15:00 ` Qais Yousef
2020-03-25 20:49 ` Alan Stern
2020-03-25 21:28 ` Rafael J. Wysocki
2020-03-26 12:27 ` Qais Yousef
2020-03-27 20:45 ` Alan Stern
2020-03-28 14:15 ` Rafael J. Wysocki
2020-03-28 19:58 ` Alan Stern
2020-03-29 9:16 ` Rafael J. Wysocki
2020-03-29 13:56 ` Rafael J. Wysocki
2020-03-29 16:27 ` Alan Stern
2020-04-03 15:04 ` Rafael J. Wysocki
2020-04-03 16:13 ` Rafael J. Wysocki
2020-04-03 16:41 ` Alan Stern
2020-04-03 18:32 ` Rafael J. Wysocki
2020-04-03 20:15 ` Alan Stern
2020-04-06 16:45 ` Rafael J. Wysocki
2020-04-06 20:25 ` Alan Stern
2020-04-09 18:45 ` Rafael J. Wysocki
2020-04-11 2:41 ` Alan Stern
2020-04-13 21:32 ` Rafael J. Wysocki
2020-04-14 13:43 ` Rafael J. Wysocki
2020-04-14 17:47 ` Alan Stern
2020-04-15 22:20 ` Rafael J. Wysocki
2020-04-16 15:18 ` Alan Stern
2020-04-17 9:57 ` Rafael J. Wysocki
2020-04-17 16:10 ` Alan Stern
2020-04-17 21:54 ` Rafael J. Wysocki
2020-04-17 23:37 ` Alan Stern
2020-04-18 9:40 ` Rafael J. Wysocki
2020-04-03 17:08 ` Rafael J. Wysocki
2020-04-20 20:26 ` Alan Stern
2020-04-21 11:15 ` Qais Yousef
2020-03-24 13:47 ` Alan Stern
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