linux-kernel - Re: [PATCH v3] USB:UAS:return ENODEV when submit urbs fail with device not attached

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Date: Thu, 29 Feb 2024 12:52:18 +0100
From: Oliver Neukum <oneukum@...e.com>
To: Weitao Wang <WeitaoWang-oc@...oxin.com>, oneukum@...e.com,
 stern@...land.harvard.edu, gregkh@...uxfoundation.org,
 linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-scsi@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net
Cc: WeitaoWang@...oxin.com, stable@...r.kernel.org
Subject: Re: [PATCH v3] USB:UAS:return ENODEV when submit urbs fail with
 device not attached



On 29.02.24 20:33, Weitao Wang wrote:
> In the scenario of entering hibernation with udisk in the system, if the
> udisk was gone or resume fail in the thaw phase of hibernation. Its state
> will be set to NOTATTACHED. At this point, usb_hub_wq was already freezed
> and can't not handle disconnect event. Next, in the poweroff phase of
> hibernation, SYNCHRONIZE_CACHE SCSI command will be sent to this udisk
> when poweroff this scsi device, which will cause uas_submit_urbs to be
> called to submit URB for sense/data/cmd pipe. However, these URBs will
> submit fail as device was set to NOTATTACHED state. Then, uas_submit_urbs
> will return a value SCSI_MLQUEUE_DEVICE_BUSY to the caller. That will lead
> the SCSI layer go into an ugly loop and system fail to go into hibernation.
> 
> On the other hand, when we specially check for -ENODEV in function
> uas_queuecommand_lck, returning DID_ERROR to SCSI layer will cause device
> poweroff fail and system shutdown instead of entering hibernation.
> 
> To fix this issue, let uas_submit_urbs to return original generic error
> when submitting URB failed. At the same time, we need to translate -ENODEV
> to DID_NOT_CONNECT for the SCSI layer.
> 
> Suggested-by: Oliver Neukum<oneukum@...e.com>
> Cc:stable@...r.kernel.org
> Signed-off-by: Weitao Wang<WeitaoWang-oc@...oxin.com>
Acked-by: Oliver Neukum <oneukum@...e.com>