From 2c84c2970c1acf83827aa97ab0e6addc3d2aa960 Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Sun, 26 Jul 2015 09:54:21 +0300 Subject: [PATCH] mei: support polling for event notification Polling on priority events is translated on waiting for event notification. One need to enable notification prior for calling select or poll system call otherwise process will not wait. Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/main.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index ffa70035af29..17b356f26686 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -608,6 +608,7 @@ static unsigned int mei_poll(struct file *file, poll_table *wait) struct mei_cl *cl = file->private_data; struct mei_device *dev; unsigned int mask = 0; + bool notify_en; if (WARN_ON(!cl || !cl->dev)) return POLLERR; @@ -616,6 +617,7 @@ static unsigned int mei_poll(struct file *file, poll_table *wait) mutex_lock(&dev->device_lock); + notify_en = cl->notify_en && (req_events & POLLPRI); if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { @@ -628,6 +630,12 @@ static unsigned int mei_poll(struct file *file, poll_table *wait) goto out; } + if (notify_en) { + poll_wait(file, &cl->ev_wait, wait); + if (cl->notify_ev) + mask |= POLLPRI; + } + if (req_events & (POLLIN | POLLRDNORM)) { poll_wait(file, &cl->rx_wait, wait); -- 2.34.1