Patch "usb: uas: unconditionally bring back host after reset" has been added to the 3.18-stable tree

Patch "usb: uas: unconditionally bring back host after reset" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: uas: unconditionally bring back host after reset

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-uas-unconditionally-bring-back-host-after-reset.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cbeef22fd611c4f47c494b821b2b105b8af970bb Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Thu, 11 Jan 2018 13:10:16 +0100
Subject: usb: uas: unconditionally bring back host after reset

From: Oliver Neukum <oneukum@suse.com>

commit cbeef22fd611c4f47c494b821b2b105b8af970bb upstream.

Quoting Hans:

If we return 1 from our post_reset handler, then our disconnect handler
will be called immediately afterwards. Since pre_reset blocks all scsi
requests our disconnect handler will then hang in the scsi_remove_host
call.

This is esp. bad because our disconnect handler hanging for ever also
stops the USB subsys from enumerating any new USB devices, causes commands
like lsusb to hang, etc.

In practice this happens when unplugging some uas devices because the hub
code may see the device as needing a warm-reset and calls usb_reset_device
before seeing the disconnect. In this case uas_configure_endpoints fails
with -ENODEV. We do not want to print an error for this, so this commit
also silences the shost_printk for -ENODEV.

ENDQUOTE

However, if we do that we better drop any unconditional execution
and report to the SCSI subsystem that we have undergone a reset
but we are not operational now.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/storage/uas.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -1067,20 +1067,19 @@ static int uas_post_reset(struct usb_int
 		return 0;
 
 	err = uas_configure_endpoints(devinfo);
-	if (err) {
+	if (err && err != ENODEV)
 		shost_printk(KERN_ERR, shost,
 			     "%s: alloc streams error %d after reset",
 			     __func__, err);
-		return 1;
-	}
 
+	/* we must unblock the host in every case lest we deadlock */
 	spin_lock_irqsave(shost->host_lock, flags);
 	scsi_report_bus_reset(shost, 0);
 	spin_unlock_irqrestore(shost->host_lock, flags);
 
 	scsi_unblock_requests(shost);
 
-	return 0;
+	return err ? 1 : 0;
 }
 
 static int uas_suspend(struct usb_interface *intf, pm_message_t message)


Patches currently in stable-queue which might be from oneukum@suse.com are

queue-3.18/usb-uas-unconditionally-bring-back-host-after-reset.patch
queue-3.18/cdc-acm-apply-quirk-for-card-reader.patch
queue-3.18/usb-cdc-acm-do-not-log-urb-submission-errors-on-disconnect.patch