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Commit 1d9013f0 authored by Tomas Winkler's avatar Tomas Winkler Committed by Greg Kroah-Hartman
Browse files

mei: fix mei_poll operation 



mei_poll returned with POLLIN w/o checking whether the operation
has really completed.
remove redundant check and locking in amthif specific handler

Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e1c0d82d

drivers/misc/mei/amthif.c

+15 −10
Original line number Diff line number Diff line
@@ -362,6 +362,18 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb) 
	return mei_amthif_run_next_cmd(dev);

}



/**

 * mei_amthif_poll - the amthif poll function

 *

 * @dev: the device structure

 * @file: pointer to file structure

 * @wait: pointer to poll_table structure

 *

 * Return: poll mask

 *

 * Locking: called under "dev->device_lock" lock

 */



unsigned int mei_amthif_poll(struct mei_device *dev,

		struct file *file, poll_table *wait)

{
@@ -369,19 +381,12 @@ unsigned int mei_amthif_poll(struct mei_device *dev, 


	poll_wait(file, &dev->iamthif_cl.wait, wait);



	mutex_lock(&dev->device_lock);

	if (!mei_cl_is_connected(&dev->iamthif_cl)) {



		mask = POLLERR;



	} else if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&

	if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&

	    dev->iamthif_file_object == file) {



		mask |= (POLLIN | POLLRDNORM);

		dev_dbg(dev->dev, "run next amthif cb\n");

		mask |= POLLIN | POLLRDNORM;

		mei_amthif_run_next_cmd(dev);

	}

	mutex_unlock(&dev->device_lock);



	return mask;

}

drivers/misc/mei/client.c

+1 −1
Original line number Diff line number Diff line
@@ -1299,7 +1299,7 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) 
	} else if (cb->fop_type == MEI_FOP_READ) {

		list_add_tail(&cb->list, &cl->rd_completed);

		if (waitqueue_active(&cl->rx_wait))

			wake_up_interruptible(&cl->rx_wait);

			wake_up_interruptible_all(&cl->rx_wait);

		else

			mei_cl_bus_rx_event(cl);

drivers/misc/mei/main.c

+11 −13
Original line number Diff line number Diff line
@@ -542,6 +542,7 @@ static long mei_compat_ioctl(struct file *file, 
 */

static unsigned int mei_poll(struct file *file, poll_table *wait)

{

	unsigned long req_events = poll_requested_events(wait);

	struct mei_cl *cl = file->private_data;

	struct mei_device *dev;

	unsigned int mask = 0;
@@ -558,22 +559,19 @@ static unsigned int mei_poll(struct file *file, poll_table *wait) 
		goto out;

	}



	mutex_unlock(&dev->device_lock);





	if (cl == &dev->iamthif_cl)

		return mei_amthif_poll(dev, file, wait);



	poll_wait(file, &cl->tx_wait, wait);



	mutex_lock(&dev->device_lock);



	if (!mei_cl_is_connected(cl)) {

		mask = POLLERR;

	if (cl == &dev->iamthif_cl) {

		mask = mei_amthif_poll(dev, file, wait);

		goto out;

	}



	mask |= (POLLIN | POLLRDNORM);

	if (req_events & (POLLIN | POLLRDNORM)) {

		poll_wait(file, &cl->rx_wait, wait);



		if (!list_empty(&cl->rd_completed))

			mask |= POLLIN | POLLRDNORM;

		else

			mei_cl_read_start(cl, 0, file);

	}



out:

	mutex_unlock(&dev->device_lock);