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 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

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-4.9 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 foo@baz Mon Dec 18 14:12:35 CET 2017

From: Jia-Ju Bai baijiaju1990@163.com 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@163.com

[ 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@163.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -1698,10 +1698,11 @@ static int vt6655_suspend(struct pci_dev MACbShutdown(priv);

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@163.com are

queue-4.9/rtl8188eu-fix-a-possible-sleep-in-atomic-bug-in-rtw_createbss_cmd.patch queue-4.9/rtl8188eu-fix-a-possible-sleep-in-atomic-bug-in-rtw_disassoc_cmd.patch queue-4.9/vt6655-fix-a-possible-sleep-in-atomic-bug-in-vt6655_suspend.patch