@@ -64,6 +64,7 @@ struct rpmsg_ctrldev {
* @queue_lock: synchronization of @queue operations
* @queue: incoming message queue
* @readq: wait object for incoming queue
+ * @sig_pending:state of signal notification
*/
struct rpmsg_eptdev {
struct device dev;
@@ -78,6 +79,8 @@ struct rpmsg_eptdev {
spinlock_t queue_lock;
struct sk_buff_head queue;
wait_queue_head_t readq;
+
+ bool sig_pending;
};
static int rpmsg_eptdev_destroy(struct device *dev, void *data)
@@ -122,6 +125,18 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
return 0;
}
+static int rpmsg_sigs_cb(struct rpmsg_device *rpdev, void *priv,
+ u32 old, u32 new)
+{
+ struct rpmsg_eptdev *eptdev = priv;
+
+ eptdev->sig_pending = true;
+
+ /* wake up any blocking processes, waiting for signal notification */
+ wake_up_interruptible(&eptdev->readq);
+ return 0;
+}
+
static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
{
struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev);
@@ -138,6 +153,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
return -EINVAL;
}
+ ept->sig_cb = rpmsg_sigs_cb;
eptdev->ept = ept;
filp->private_data = eptdev;
@@ -157,6 +173,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
eptdev->ept = NULL;
}
mutex_unlock(&eptdev->ept_lock);
+ eptdev->sig_pending = false;
/* Discard all SKBs */
while (!skb_queue_empty(&eptdev->queue)) {
@@ -263,6 +280,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
if (!skb_queue_empty(&eptdev->queue))
mask |= EPOLLIN | EPOLLRDNORM;
+ if (eptdev->sig_pending)
+ mask |= POLLPRI;
+
mask |= rpmsg_poll(eptdev->ept, filp, wait);
return mask;
@@ -306,6 +326,7 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
switch (cmd) {
case TIOCMGET:
+ eptdev->sig_pending = false;
ret = rpmsg_get_signals(eptdev->ept);
if (!ret)
ret = put_user(ret, (int __user *)arg);
Register a callback to get the signal notifications from rpmsg and send POLLPRI mask to indicate the signal change in POLL system call. Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org> --- drivers/rpmsg/rpmsg_char.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)