This is a note to let you know that I've just added the patch titled
vt6655: Fix a possible sleep-in-atomic bug in vt6655_suspend
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:
vt6655-fix-a-possible-sleep-in-atomic-bug-in-vt6655_suspend.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Dec 18 14:47:43 CET 2017
From: Jia-Ju Bai <baijiaju1990@xxxxxxx>
Date: Mon, 9 Oct 2017 16:45:55 +0800
Subject: vt6655: Fix a possible sleep-in-atomic bug in vt6655_suspend
From: Jia-Ju Bai <baijiaju1990@xxxxxxx>
[ Upstream commit 42c8eb3f6e15367981b274cb79ee4657e2c6949d ]
The driver may sleep under a spinlock, and the function call path is:
vt6655_suspend (acquire the spinlock)
pci_set_power_state
__pci_start_power_transition (drivers/pci/pci.c)
msleep --> may sleep
To fix it, pci_set_power_state is called without having a spinlock.
This bug is found by my static analysis tool and my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/vt6655/device_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -1693,10 +1693,11 @@ static int vt6655_suspend(struct pci_dev
MACbShutdown(priv->PortOffset);
pci_disable_device(pcid);
- pci_set_power_state(pcid, pci_choose_state(pcid, state));
spin_unlock_irqrestore(&priv->lock, flags);
+ pci_set_power_state(pcid, pci_choose_state(pcid, state));
+
return 0;
}
Patches currently in stable-queue which might be from baijiaju1990@xxxxxxx are
queue-4.4/vt6655-fix-a-possible-sleep-in-atomic-bug-in-vt6655_suspend.patch