linux-kernel - [PATCH 3.16 167/217] usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue

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Date:	Wed, 27 Apr 2016 01:02:21 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@...esas.com>,
	"Felipe Balbi" <felipe.balbi@...ux.intel.com>
Subject: [PATCH 3.16 167/217] usb: renesas_usbhs: fix to avoid using a
 disabled ep in usbhsg_queue_done()

3.16.35-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit 4fccb0767fdbdb781a9c5b5c15ee7b219443c89d upstream.

This patch fixes an issue that usbhsg_queue_done() may cause kernel
panic when dma callback is running and usb_ep_disable() is called
by interrupt handler. (Especially, we can reproduce this issue using
g_audio with usb-dmac driver.)

For example of a flow:
 usbhsf_dma_complete (on tasklet)
  --> usbhsf_pkt_handler (on tasklet)
   --> usbhsg_queue_done (on tasklet)
    *** interrupt happened and usb_ep_disable() is called ***
    --> usbhsg_queue_pop (on tasklet)
     Then, oops happened.

Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/renesas_usbhs/mod_gadget.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -137,10 +137,14 @@ static void usbhsg_queue_done(struct usb
 	struct usbhs_pipe *pipe = pkt->pipe;
 	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
+	unsigned long flags;
 
 	ureq->req.actual = pkt->actual;
 
-	usbhsg_queue_pop(uep, ureq, 0);
+	usbhs_lock(priv, flags);
+	if (uep)
+		__usbhsg_queue_pop(uep, ureq, 0);
+	usbhs_unlock(priv, flags);
 }
 
 static void usbhsg_queue_push(struct usbhsg_uep *uep,