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-rw-r--r--net/socket.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/net/socket.c b/net/socket.c
index 4ca1526..45afa64 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -104,6 +104,12 @@
#include <linux/route.h>
#include <linux/sockios.h>
#include <linux/atalk.h>
+#include <net/ll_poll.h>
+
+#ifdef CONFIG_NET_LL_RX_POLL
+unsigned int sysctl_net_ll_read __read_mostly;
+unsigned int sysctl_net_ll_poll __read_mostly;
+#endif
static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
@@ -1142,13 +1148,24 @@ EXPORT_SYMBOL(sock_create_lite);
/* No kernel lock held - perfect */
static unsigned int sock_poll(struct file *file, poll_table *wait)
{
+ unsigned int busy_flag = 0;
struct socket *sock;
/*
* We can't return errors to poll, so it's either yes or no.
*/
sock = file->private_data;
- return sock->ops->poll(file, sock, wait);
+
+ if (sk_can_busy_loop(sock->sk)) {
+ /* this socket can poll_ll so tell the system call */
+ busy_flag = POLL_BUSY_LOOP;
+
+ /* once, only if requested by syscall */
+ if (wait && (wait->_key & POLL_BUSY_LOOP))
+ sk_busy_loop(sock->sk, 1);
+ }
+
+ return busy_flag | sock->ops->poll(file, sock, wait);
}
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
@@ -2635,7 +2652,9 @@ static int __init sock_init(void)
*/
#ifdef CONFIG_NETFILTER
- netfilter_init();
+ err = netfilter_init();
+ if (err)
+ goto out;
#endif
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
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