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Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c55
1 files changed, 40 insertions, 15 deletions
diff --git a/net/socket.c b/net/socket.c
index f10f1d947c78..2d752e9eb3f9 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -117,8 +117,10 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
static int sock_mmap(struct file *file, struct vm_area_struct *vma);
static int sock_close(struct inode *inode, struct file *file);
-static __poll_t sock_poll(struct file *file,
- struct poll_table_struct *wait);
+static struct wait_queue_head *sock_get_poll_head(struct file *file,
+ __poll_t events);
+static __poll_t sock_poll_mask(struct file *file, __poll_t);
+static __poll_t sock_poll(struct file *file, struct poll_table_struct *wait);
static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT
static long compat_sock_ioctl(struct file *file,
@@ -141,6 +143,8 @@ static const struct file_operations socket_file_ops = {
.llseek = no_llseek,
.read_iter = sock_read_iter,
.write_iter = sock_write_iter,
+ .get_poll_head = sock_get_poll_head,
+ .poll_mask = sock_poll_mask,
.poll = sock_poll,
.unlocked_ioctl = sock_ioctl,
#ifdef CONFIG_COMPAT
@@ -1114,27 +1118,48 @@ out_release:
}
EXPORT_SYMBOL(sock_create_lite);
-/* No kernel lock held - perfect */
-static __poll_t sock_poll(struct file *file, poll_table *wait)
+static struct wait_queue_head *sock_get_poll_head(struct file *file,
+ __poll_t events)
{
- __poll_t busy_flag = 0;
- struct socket *sock;
+ struct socket *sock = file->private_data;
+
+ if (!sock->ops->poll_mask)
+ return NULL;
+ sock_poll_busy_loop(sock, events);
+ return sk_sleep(sock->sk);
+}
+
+static __poll_t sock_poll_mask(struct file *file, __poll_t events)
+{
+ struct socket *sock = file->private_data;
/*
- * We can't return errors to poll, so it's either yes or no.
+ * We need to be sure we are in sync with the socket flags modification.
+ *
+ * This memory barrier is paired in the wq_has_sleeper.
*/
- sock = file->private_data;
+ smp_mb();
+
+ /* this socket can poll_ll so tell the system call */
+ return sock->ops->poll_mask(sock, events) |
+ (sk_can_busy_loop(sock->sk) ? POLL_BUSY_LOOP : 0);
+}
- if (sk_can_busy_loop(sock->sk)) {
- /* this socket can poll_ll so tell the system call */
- busy_flag = POLL_BUSY_LOOP;
+/* No kernel lock held - perfect */
+static __poll_t sock_poll(struct file *file, poll_table *wait)
+{
+ struct socket *sock = file->private_data;
+ __poll_t events = poll_requested_events(wait), mask = 0;
- /* once, only if requested by syscall */
- if (wait && (wait->_key & POLL_BUSY_LOOP))
- sk_busy_loop(sock->sk, 1);
+ if (sock->ops->poll) {
+ sock_poll_busy_loop(sock, events);
+ mask = sock->ops->poll(file, sock, wait);
+ } else if (sock->ops->poll_mask) {
+ sock_poll_wait(file, sock_get_poll_head(file, events), wait);
+ mask = sock->ops->poll_mask(sock, events);
}
- return busy_flag | sock->ops->poll(file, sock, wait);
+ return mask | sock_poll_busy_flag(sock);
}
static int sock_mmap(struct file *file, struct vm_area_struct *vma)