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mei: support polling for event notification

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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>
This commit is contained in:
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);