Patch "[media] stk1160: Make sure current buffer is released" has been added to the 4.0-stable tree

Patch "[media] stk1160: Make sure current buffer is released" has been added to the 4.0-stable tree

[gregkh]

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

    [media] stk1160: Make sure current buffer is released

to the 4.0-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:
     stk1160-make-sure-current-buffer-is-released.patch
and it can be found in the queue-4.0 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 aeff09276748b66072f2db2e668cec955cf41959 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Date: Tue, 10 Mar 2015 11:37:14 -0300
Subject: [media] stk1160: Make sure current buffer is released

From: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>

commit aeff09276748b66072f2db2e668cec955cf41959 upstream.

The available (i.e. not used) buffers are returned by stk1160_clear_queue(),
on the stop_streaming() path. However, this is insufficient and the current
buffer must be released as well. Fix it.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/usb/stk1160/stk1160-v4l.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

--- a/drivers/media/usb/stk1160/stk1160-v4l.c
+++ b/drivers/media/usb/stk1160/stk1160-v4l.c
@@ -240,6 +240,11 @@ static int stk1160_stop_streaming(struct
 	if (mutex_lock_interruptible(&dev->v4l_lock))
 		return -ERESTARTSYS;
 
+	/*
+	 * Once URBs are cancelled, the URB complete handler
+	 * won't be running. This is required to safely release the
+	 * current buffer (dev->isoc_ctl.buf).
+	 */
 	stk1160_cancel_isoc(dev);
 
 	/*
@@ -620,8 +625,16 @@ void stk1160_clear_queue(struct stk1160
 		stk1160_info("buffer [%p/%d] aborted\n",
 				buf, buf->vb.v4l2_buf.index);
 	}
-	/* It's important to clear current buffer */
-	dev->isoc_ctl.buf = NULL;
+
+	/* It's important to release the current buffer */
+	if (dev->isoc_ctl.buf) {
+		buf = dev->isoc_ctl.buf;
+		dev->isoc_ctl.buf = NULL;
+
+		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+		stk1160_info("buffer [%p/%d] aborted\n",
+				buf, buf->vb.v4l2_buf.index);
+	}
 	spin_unlock_irqrestore(&dev->buf_lock, flags);
 }
 


Patches currently in stable-queue which might be from ezequiel@vanguardiasur.com.ar are

queue-4.0/stk1160-make-sure-current-buffer-is-released.patch