diff options
Diffstat (limited to 'drivers/nfc/virtual_ncidev.c')
| -rw-r--r-- | drivers/nfc/virtual_ncidev.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c index f73ee0bf3593..221fa3bb8705 100644 --- a/drivers/nfc/virtual_ncidev.c +++ b/drivers/nfc/virtual_ncidev.c @@ -10,6 +10,7 @@ #include <linux/module.h> #include <linux/miscdevice.h> #include <linux/mutex.h> +#include <linux/wait.h> #include <net/nfc/nci_core.h> enum virtual_ncidev_mode { @@ -27,6 +28,7 @@ enum virtual_ncidev_mode { NFC_PROTO_ISO15693_MASK) static enum virtual_ncidev_mode state; +static DECLARE_WAIT_QUEUE_HEAD(wq); static struct miscdevice miscdev; static struct sk_buff *send_buff; static struct nci_dev *ndev; @@ -61,11 +63,12 @@ static int virtual_nci_send(struct nci_dev *ndev, struct sk_buff *skb) } send_buff = skb_copy(skb, GFP_KERNEL); mutex_unlock(&nci_mutex); + wake_up_interruptible(&wq); return 0; } -static struct nci_ops virtual_nci_ops = { +static const struct nci_ops virtual_nci_ops = { .open = virtual_nci_open, .close = virtual_nci_close, .send = virtual_nci_send @@ -77,9 +80,11 @@ static ssize_t virtual_ncidev_read(struct file *file, char __user *buf, size_t actual_len; mutex_lock(&nci_mutex); - if (!send_buff) { + while (!send_buff) { mutex_unlock(&nci_mutex); - return 0; + if (wait_event_interruptible(wq, send_buff)) + return -EFAULT; + mutex_lock(&nci_mutex); } actual_len = min_t(size_t, count, send_buff->len); @@ -170,7 +175,7 @@ static int virtual_ncidev_close(struct inode *inode, struct file *file) static long virtual_ncidev_ioctl(struct file *flip, unsigned int cmd, unsigned long arg) { - struct nfc_dev *nfc_dev = ndev->nfc_dev; + const struct nfc_dev *nfc_dev = ndev->nfc_dev; void __user *p = (void __user *)arg; if (cmd != IOCTL_GET_NCIDEV_IDX) |