usb: uas: fix a plug & unplug racing (3e99862c) · Commits · 戴 / test

When a uas disk is plugged into an external hub, uas_probe() will be called by the hub thread to do the probe. It will first create a SCSI host and then do the scan for this host. During the scan, it will probe the LUN using SCSI INQUERY command which will be packed in the URB and submitted to uas disk. There might be a chance that this external hub with uas disk attached is unplugged during the scan. In this case, uas driver will fail to submit the URB (due to the NOTATTACHED state of uas device) and try to put this SCSI command back to request queue waiting for next chance to run. In normal case, this cycle will terminate when hub thread gets disconnection event and calls into uas_disconnect() accordingly. But in this case, uas_disconnect() will not be called because hub thread of external hub gets stuck waiting for the completion of this SCSI command. A deadlock happened. In this fix, uas will call scsi_scan_host() asynchronously to avoid the blocking of hub thread. Signed-off-by:

EJ Hsu <ejh@nvidia.com> Acked-by:

Oliver Neukum <oneukum@suse.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200130092506.102760-1-ejh@nvidia.com Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/storage/uas.c

+22 −1

Original line number	Diff line number	Diff line
		@@ -45,6 +45,7 @@ struct uas_dev_info {
		struct scsi_cmnd *cmnd[MAX_CMNDS];
		spinlock_t lock;
		struct work_struct work;
		struct work_struct scan_work; /* for async scanning */
		};

		enum {
		@@ -114,6 +115,17 @@ out:
		spin_unlock_irqrestore(&devinfo->lock, flags);
		}

		static void uas_scan_work(struct work_struct *work)
		{
		struct uas_dev_info *devinfo =
		container_of(work, struct uas_dev_info, scan_work);
		struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf);

		dev_dbg(&devinfo->intf->dev, "starting scan\n");
		scsi_scan_host(shost);
		dev_dbg(&devinfo->intf->dev, "scan complete\n");
		}

		static void uas_add_work(struct uas_cmd_info *cmdinfo)
		{
		struct scsi_pointer scp = (void )cmdinfo;
		@@ -982,6 +994,7 @@ static int uas_probe(struct usb_interface intf, const struct usb_device_id id)
		init_usb_anchor(&devinfo->data_urbs);
		spin_lock_init(&devinfo->lock);
		INIT_WORK(&devinfo->work, uas_do_work);
		INIT_WORK(&devinfo->scan_work, uas_scan_work);

		result = uas_configure_endpoints(devinfo);
		if (result)
		@@ -998,7 +1011,9 @@ static int uas_probe(struct usb_interface intf, const struct usb_device_id id)
		if (result)
		goto free_streams;

		scsi_scan_host(shost);
		/* Submit the delayed_work for SCSI-device scanning */
		schedule_work(&devinfo->scan_work);

		return result;

		free_streams:
		@@ -1166,6 +1181,12 @@ static void uas_disconnect(struct usb_interface *intf)
		usb_kill_anchored_urbs(&devinfo->data_urbs);
		uas_zap_pending(devinfo, DID_NO_CONNECT);

		/*
		* Prevent SCSI scanning (if it hasn't started yet)
		* or wait for the SCSI-scanning routine to stop.
		*/
		cancel_work_sync(&devinfo->scan_work);

		scsi_remove_host(shost);
		uas_free_streams(devinfo);
		scsi_host_put(shost);

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