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 4.9-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-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8ec04a491825e08068e92bed0bba7821893b6433 Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@xxxxxxxxx>
Date: Fri, 17 Feb 2017 11:09:09 +0000
Subject: staging: comedi: jr3_pci: cope with jiffies wraparound
From: Ian Abbott <abbotti@xxxxxxxxx>
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.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/jr3_pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -611,7 +611,7 @@ 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 abbotti@xxxxxxxxx are
queue-4.9/staging-comedi-jr3_pci-fix-possible-null-pointer-dereference.patch
queue-4.9/staging-comedi-jr3_pci-cope-with-jiffies-wraparound.patch