mei: support polling for event notification (2c84c297) · Commits · 戴 / test

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>

drivers/misc/mei/main.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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);

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