mISDN: Fix a sleep-in-atomic bug

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 <baijiaju1990@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/isdn/mISDN/stack.c b/drivers/isdn/mISDN/stack.c
index 8b7faea..422dced 100644 (file)
--- a/drivers/isdn/mISDN/stack.c
+++ b/drivers/isdn/mISDN/stack.c
@@ -75,7 +75,7 @@ send_socklist(struct mISDN_sock_list *sl, struct sk_buff *skb)
                if (sk->sk_state != MISDN_BOUND)
                        continue;
                if (!cskb)
-                       cskb = skb_copy(skb, GFP_KERNEL);
+                       cskb = skb_copy(skb, GFP_ATOMIC);
                if (!cskb) {
                        printk(KERN_WARNING "%s no skb\n", __func__);
                        break;