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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 <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Tomas Winkler 2015-07-26 09:54:21 +03:00 committed by Greg Kroah-Hartman
parent 3c7c8468e5
commit 2c84c2970c
1 changed files with 8 additions and 0 deletions
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8
drivers/misc/mei/main.c
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@ -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);