diff options
| -rw-r--r-- | drivers/net/wwan/wwan_core.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c index 9346b2661eb3..d5a197da4a41 100644 --- a/drivers/net/wwan/wwan_core.c +++ b/drivers/net/wwan/wwan_core.c @@ -12,6 +12,7 @@ #include <linux/skbuff.h> #include <linux/slab.h> #include <linux/types.h> +#include <linux/termios.h> #include <linux/wwan.h> /* Maximum number of minors in use */ @@ -618,6 +619,30 @@ static __poll_t wwan_port_fops_poll(struct file *filp, poll_table *wait) return mask; } +static long wwan_port_fops_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct wwan_port *port = filp->private_data; + + switch (cmd) { + case TIOCINQ: { /* aka SIOCINQ aka FIONREAD */ + unsigned long flags; + struct sk_buff *skb; + int amount = 0; + + spin_lock_irqsave(&port->rxq.lock, flags); + skb_queue_walk(&port->rxq, skb) + amount += skb->len; + spin_unlock_irqrestore(&port->rxq.lock, flags); + + return put_user(amount, (int __user *)arg); + } + + default: + return -ENOIOCTLCMD; + } +} + static const struct file_operations wwan_port_fops = { .owner = THIS_MODULE, .open = wwan_port_fops_open, @@ -625,6 +650,10 @@ static const struct file_operations wwan_port_fops = { .read = wwan_port_fops_read, .write = wwan_port_fops_write, .poll = wwan_port_fops_poll, + .unlocked_ioctl = wwan_port_fops_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = compat_ptr_ioctl, +#endif .llseek = noop_llseek, }; |