4.4-stable review patch.  If anyone has any objections, please let me know.


From: Jia-Ju Bai <baijiaju1...@163.com>

[ Upstream commit 93818da5eed63fbc17b64080406ea53b86b23309 ]

The driver may sleep under a read spin lock, and the function call path is:
send_socklist (acquire the lock by read_lock)
  skb_copy(GFP_KERNEL) --> may sleep

To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".

Signed-off-by: Jia-Ju Bai <baijiaju1...@163.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 drivers/isdn/mISDN/stack.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/isdn/mISDN/stack.c
+++ b/drivers/isdn/mISDN/stack.c
@@ -72,7 +72,7 @@ send_socklist(struct mISDN_sock_list *sl
                if (sk->sk_state != MISDN_BOUND)
                if (!cskb)
-                       cskb = skb_copy(skb, GFP_KERNEL);
+                       cskb = skb_copy(skb, GFP_ATOMIC);
                if (!cskb) {
                        printk(KERN_WARNING "%s no skb\n", __func__);

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