From: Greg KH <gregkh@linuxfoundation.org>
To: "xinhui.pan" <xinhuix.pan@intel.com>
Cc: linux-kernel@vger.kernel.org, stern@rowland.harvard.edu,
sarah.a.sharp@linux.intel.com, dan.j.williams@intel.com,
burzalodowa@gmail.com, yanmin_zhang@linux.intel.com
Subject: Re: [PATCH] usb/core/hub.c: return immediately when hub_port_init hits timedout
Date: Thu, 6 Mar 2014 22:47:18 -0800 [thread overview]
Message-ID: <20140307064718.GA20065@kroah.com> (raw)
In-Reply-To: <53196414.8090703@intel.com>
On Fri, Mar 07, 2014 at 02:15:48PM +0800, xinhui.pan wrote:
> From: "xinhui.pan" <xinhuiX.pan@intel.com>
I doubt your name as a "." in it, right?
> some devices go crasy, we can't resume it even after reset.
I don't understand, what do you mean by this? What exactly does a
device do, and why does it do it? And what happens?
> This case will cause timeout again and again. What is worse, if there
> is a watchdog, panic will be generated as timer expires.
A watchdog where?
> To prevent this, we just return -ENODEV immediately. Later it will be
> re-enumerated.
What will cause it to be re-enumerated?
confused,
greg k-h
next prev parent reply other threads:[~2014-03-07 6:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 6:15 [PATCH] usb/core/hub.c: return immediately when hub_port_init hits timedout xinhui.pan
2014-03-07 6:47 ` Greg KH [this message]
2014-03-07 7:32 ` xinhui.pan
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