Patch "usb: gadget: pch_udc: reorder spin_[un]lock to avoid deadlock" has been added to the 4.7-stable tree

[<gregkh@linuxfoundation.org>]

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

    usb: gadget: pch_udc: reorder spin_[un]lock to avoid deadlock

to the 4.7-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-gadget-pch_udc-reorder-spin_lock-to-avoid-deadlock.patch
and it can be found in the queue-4.7 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 1d23d16a88e6c8143b07339435ba061b131ebb8c Mon Sep 17 00:00:00 2001
From: Iago Abal <mail@iagoabal.eu>
Date: Tue, 21 Jun 2016 12:01:11 +0200
Subject: usb: gadget: pch_udc: reorder spin_[un]lock to avoid deadlock

From: Iago Abal <mail@iagoabal.eu>

commit 1d23d16a88e6c8143b07339435ba061b131ebb8c upstream.

The above commit reordered spin_lock/unlock and now `&dev->lock' is acquired
(rather than released) before calling `dev->driver->disconnect',
`dev->driver->setup', `dev->driver->suspend', `usb_gadget_giveback_request', and
`usb_gadget_udc_reset'.

But this *may* not be the right way to fix the problem pointed by d3cb25a12138.

Note that the other usb/gadget/udc drivers do release the lock before calling
these functions. There are also inconsistencies within pch_udc.c, where
`dev->driver->disconnect' is called while holding `&dev->lock' in lines 613 and
1184, but not in line 2739.

Finally, commit d3cb25a12138 may have introduced several potential deadlocks.

For instance, EBA (https://github.com/models-team/eba) reports:

    Double lock in drivers/usb/gadget/udc/pch_udc.c
    first at 2791: spin_lock(& dev->lock); [pch_udc_isr]
    second at 2694: spin_lock(& dev->lock); [pch_udc_svc_cfg_interrupt]
        after calling from 2793: pch_udc_dev_isr(dev, dev_intr);
        after calling from 2724: pch_udc_svc_cfg_interrupt(dev);

Similarly, other potential deadlocks are 2791 -> 2793 -> 2721 -> 2657; and
2791 -> 2793 -> 2711 -> 2573 -> 1499 -> 1480.

Fixes: d3cb25a12138 ("usb: gadget: udc: fix spin_lock in pch_udc")
Signed-off-by: Iago Abal <mail@iagoabal.eu>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/udc/pch_udc.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -1477,11 +1477,11 @@ static void complete_req(struct pch_udc_
 		req->dma_mapped = 0;
 	}
 	ep->halted = 1;
-	spin_lock(&dev->lock);
+	spin_unlock(&dev->lock);
 	if (!ep->in)
 		pch_udc_ep_clear_rrdy(ep);
 	usb_gadget_giveback_request(&ep->ep, &req->req);
-	spin_unlock(&dev->lock);
+	spin_lock(&dev->lock);
 	ep->halted = halted;
 }
 
@@ -2573,9 +2573,9 @@ static void pch_udc_svc_ur_interrupt(str
 		empty_req_queue(ep);
 	}
 	if (dev->driver) {
-		spin_lock(&dev->lock);
-		usb_gadget_udc_reset(&dev->gadget, dev->driver);
 		spin_unlock(&dev->lock);
+		usb_gadget_udc_reset(&dev->gadget, dev->driver);
+		spin_lock(&dev->lock);
 	}
 }
 
@@ -2654,9 +2654,9 @@ static void pch_udc_svc_intf_interrupt(s
 		dev->ep[i].halted = 0;
 	}
 	dev->stall = 0;
-	spin_lock(&dev->lock);
-	dev->driver->setup(&dev->gadget, &dev->setup_data);
 	spin_unlock(&dev->lock);
+	dev->driver->setup(&dev->gadget, &dev->setup_data);
+	spin_lock(&dev->lock);
 }
 
 /**
@@ -2691,9 +2691,9 @@ static void pch_udc_svc_cfg_interrupt(st
 	dev->stall = 0;
 
 	/* call gadget zero with setup data received */
-	spin_lock(&dev->lock);
-	dev->driver->setup(&dev->gadget, &dev->setup_data);
 	spin_unlock(&dev->lock);
+	dev->driver->setup(&dev->gadget, &dev->setup_data);
+	spin_lock(&dev->lock);
 }
 
 /**


Patches currently in stable-queue which might be from mail@iagoabal.eu are

queue-4.7/usb-gadget-pch_udc-reorder-spin_lock-to-avoid-deadlock.patch