Patch "staging: comedi: jr3_pci: cope with jiffies wraparound" has been added to the 4.4-stable tree

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

staging: comedi: jr3_pci: cope with jiffies wraparound

to the 4.4-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:
staging-comedi-jr3_pci-cope-with-jiffies-wraparound.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ian Abbott <[email protected]>
Date: Fri, 17 Feb 2017 11:09:09 +0000
Subject: staging: comedi: jr3_pci: cope with jiffies wraparound

From: Ian Abbott <[email protected]>

commit 8ec04a491825e08068e92bed0bba7821893b6433 upstream.

The timer expiry routine jr3_pci_poll_dev() checks for expiry by checking whether the absolute value of jiffies (stored in local variable now) is greater than the expected expiry time in jiffy units. This will fail when jiffies wraps around. Also, it seems to make sense to handle the expiry one jiffy earlier than the current test. Use time_after_eq() to check for expiry.

---
 drivers/staging/comedi/drivers/jr3_pci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -610,7 +610,7 @@ static void jr3_pci_poll_dev(unsigned lo
 		s = &dev->subdevices[i];
 		spriv = s->private;
 
-		if (now > spriv->next_time_min) {
+		if (time_after_eq(now, spriv->next_time_min)) {
 			struct jr3_pci_poll_delay sub_delay;
 
 			sub_delay = jr3_pci_poll_subdevice(s);

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/staging-comedi-jr3_pci-fix-possible-null-pointer-dereference.patch queue-4.4/staging-comedi-jr3_pci-cope-with-jiffies-wraparound.patch