From: Lu Baolu <baolu.lu@linux.intel.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH v2 1/1] usb: xhci: fix return value of xhci_setup_device()
Date: Thu, 8 Sep 2016 15:29:25 +0800 [thread overview]
Message-ID: <57D11355.8040505@linux.intel.com> (raw)
In-Reply-To: <20160908063828.GA5485@kroah.com>
Hi Greg,
On 09/08/2016 02:38 PM, Greg KH wrote:
> On Thu, Sep 08, 2016 at 08:41:02AM +0800, Lu Baolu wrote:
>> xhci_setup_device() should return failure with correct error number
>> when xhci host has died, removed or halted.
>>
>> Cc: stable@vger.kernel.org # 4.3+
> Why is this a stable kernel issue? What bug does it fix that affects
> users?
During usb device enumeration, if xhci host is not accessible (died,
removed or halted), the hc_driver->address_device() should return
a corresponding error code to usb core. But current xhci driver just
returns success. This will mislead usb core to continue enumeration:
reading device descriptor, which will result in failure, and users will
get a misleading message like "device descriptor read/8, error -110".
Best regards,
Lu Baolu
next prev parent reply other threads:[~2016-09-08 7:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-08 0:41 [PATCH v2 1/1] usb: xhci: fix return value of xhci_setup_device() Lu Baolu
2016-09-08 6:38 ` Greg KH
2016-09-08 7:29 ` Lu Baolu [this message]
2016-09-08 8:58 ` Greg KH
2016-09-08 9:08 ` Lu Baolu
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