Commit 9ab89c40 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'rpmsg-v4.17' of git://github.com/andersson/remoteproc 

Pull rpmsg updates from Bjorn Andersson:

 - transition the rpmsg_trysend() code paths of SMD and GLINK to use
   non-sleeping locks

 - revert the overly optimistic handling of discovered SMD channels

 - fix an issue in SMD where incoming messages race with the probing of
   a client driver

* tag 'rpmsg-v4.17' of git://github.com/andersson/remoteproc:
  rpmsg: smd: Use announce_create to process any receive work
  rpmsg: Only invoke announce_create for rpdev with endpoints
  rpmsg: smd: Fix container_of macros
  Revert "rpmsg: smd: Create device for all channels"
  rpmsg: glink: Use spinlock in tx path
  rpmsg: smd: Use spinlock in tx path
  rpmsg: smd: use put_device() if device_register fail
  rpmsg: glink: use put_device() if device_register fail
parents f77cfbe6 0d72038c

drivers/rpmsg/qcom_glink_native.c

+11 −7
Original line number Diff line number Diff line
@@ -113,7 +113,7 @@ struct qcom_glink { 
	spinlock_t rx_lock;

	struct list_head rx_queue;



	struct mutex tx_lock;

	spinlock_t tx_lock;



	spinlock_t idr_lock;

	struct idr lcids;
@@ -288,15 +288,14 @@ static int qcom_glink_tx(struct qcom_glink *glink, 
			 const void *data, size_t dlen, bool wait)

{

	unsigned int tlen = hlen + dlen;

	int ret;

	unsigned long flags;

	int ret = 0;



	/* Reject packets that are too big */

	if (tlen >= glink->tx_pipe->length)

		return -EINVAL;



	ret = mutex_lock_interruptible(&glink->tx_lock);

	if (ret)

		return ret;

	spin_lock_irqsave(&glink->tx_lock, flags);



	while (qcom_glink_tx_avail(glink) < tlen) {

		if (!wait) {
@@ -304,7 +303,12 @@ static int qcom_glink_tx(struct qcom_glink *glink, 
			goto out;

		}



		/* Wait without holding the tx_lock */

		spin_unlock_irqrestore(&glink->tx_lock, flags);



		usleep_range(10000, 15000);



		spin_lock_irqsave(&glink->tx_lock, flags);

	}



	qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
@@ -313,7 +317,7 @@ static int qcom_glink_tx(struct qcom_glink *glink, 
	mbox_client_txdone(glink->mbox_chan, 0);



out:

	mutex_unlock(&glink->tx_lock);

	spin_unlock_irqrestore(&glink->tx_lock, flags);



	return ret;

}
@@ -1567,7 +1571,7 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev, 
	glink->features = features;

	glink->intentless = intentless;



	mutex_init(&glink->tx_lock);

	spin_lock_init(&glink->tx_lock);

	spin_lock_init(&glink->rx_lock);

	INIT_LIST_HEAD(&glink->rx_queue);

	INIT_WORK(&glink->rx_work, qcom_glink_work);

drivers/rpmsg/qcom_glink_smem.c

+2 −1
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent, 
	ret = device_register(dev);

	if (ret) {

		pr_err("failed to register glink edge\n");

		put_device(dev);

		return ERR_PTR(ret);

	}
@@ -299,7 +300,7 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent, 
	return glink;



err_put_dev:

	put_device(dev);

	device_unregister(dev);



	return ERR_PTR(ret);

}

drivers/rpmsg/qcom_smd.c

+38 −13
Original line number Diff line number Diff line
@@ -167,9 +167,9 @@ struct qcom_smd_endpoint { 
	struct qcom_smd_channel *qsch;

};



#define to_smd_device(_rpdev)	container_of(_rpdev, struct qcom_smd_device, rpdev)

#define to_smd_device(r)	container_of(r, struct qcom_smd_device, rpdev)

#define to_smd_edge(d)		container_of(d, struct qcom_smd_edge, dev)

#define to_smd_endpoint(ept)	container_of(ept, struct qcom_smd_endpoint, ept)

#define to_smd_endpoint(e)	container_of(e, struct qcom_smd_endpoint, ept)



/**

 * struct qcom_smd_channel - smd channel struct
@@ -205,7 +205,7 @@ struct qcom_smd_channel { 
	struct smd_channel_info_pair *info;

	struct smd_channel_info_word_pair *info_word;



	struct mutex tx_lock;

	spinlock_t tx_lock;

	wait_queue_head_t fblockread_event;



	void *tx_fifo;
@@ -729,6 +729,7 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, 
{

	__le32 hdr[5] = { cpu_to_le32(len), };

	int tlen = sizeof(hdr) + len;

	unsigned long flags;

	int ret;



	/* Word aligned channels only accept word size aligned data */
@@ -739,9 +740,11 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, 
	if (tlen >= channel->fifo_size)

		return -EINVAL;



	ret = mutex_lock_interruptible(&channel->tx_lock);

	if (ret)

		return ret;

	/* Highlight the fact that if we enter the loop below we might sleep */

	if (wait)

		might_sleep();



	spin_lock_irqsave(&channel->tx_lock, flags);



	while (qcom_smd_get_tx_avail(channel) < tlen &&

	       channel->state == SMD_CHANNEL_OPENED) {
@@ -753,7 +756,7 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, 
		SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 0);



		/* Wait without holding the tx_lock */

		mutex_unlock(&channel->tx_lock);

		spin_unlock_irqrestore(&channel->tx_lock, flags);



		ret = wait_event_interruptible(channel->fblockread_event,

				       qcom_smd_get_tx_avail(channel) >= tlen ||
@@ -761,9 +764,7 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, 
		if (ret)

			return ret;



		ret = mutex_lock_interruptible(&channel->tx_lock);

		if (ret)

			return ret;

		spin_lock_irqsave(&channel->tx_lock, flags);



		SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1);

	}
@@ -787,7 +788,7 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, 
	qcom_smd_signal_channel(channel);



out_unlock:

	mutex_unlock(&channel->tx_lock);

	spin_unlock_irqrestore(&channel->tx_lock, flags);



	return ret;

}
@@ -996,8 +997,26 @@ static struct device_node *qcom_smd_match_channel(struct device_node *edge_node, 
	return NULL;

}



static int qcom_smd_announce_create(struct rpmsg_device *rpdev)

{

	struct qcom_smd_endpoint *qept = to_smd_endpoint(rpdev->ept);

	struct qcom_smd_channel *channel = qept->qsch;

	unsigned long flags;

	bool kick_state;



	spin_lock_irqsave(&channel->recv_lock, flags);

	kick_state = qcom_smd_channel_intr(channel);

	spin_unlock_irqrestore(&channel->recv_lock, flags);



	if (kick_state)

		schedule_work(&channel->edge->state_work);



	return 0;

}



static const struct rpmsg_device_ops qcom_smd_device_ops = {

	.create_ept = qcom_smd_create_ept,

	.announce_create = qcom_smd_announce_create,

};



static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops = {
@@ -1090,7 +1109,7 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed 
	if (!channel->name)

		return ERR_PTR(-ENOMEM);



	mutex_init(&channel->tx_lock);

	spin_lock_init(&channel->tx_lock);

	spin_lock_init(&channel->recv_lock);

	init_waitqueue_head(&channel->fblockread_event);

	init_waitqueue_head(&channel->state_change_event);
@@ -1234,6 +1253,11 @@ static void qcom_channel_state_worker(struct work_struct *work) 
		if (channel->state != SMD_CHANNEL_CLOSED)

			continue;



		remote_state = GET_RX_CHANNEL_INFO(channel, state);

		if (remote_state != SMD_CHANNEL_OPENING &&

		    remote_state != SMD_CHANNEL_OPENED)

			continue;



		if (channel->registered)

			continue;
@@ -1408,6 +1432,7 @@ struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, 
	ret = device_register(&edge->dev);

	if (ret) {

		pr_err("failed to register smd edge\n");

		put_device(&edge->dev);

		return ERR_PTR(ret);

	}
@@ -1428,7 +1453,7 @@ struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, 
	return edge;



unregister_dev:

	put_device(&edge->dev);

	device_unregister(&edge->dev);

	return ERR_PTR(ret);

}

EXPORT_SYMBOL(qcom_smd_register_edge);

drivers/rpmsg/rpmsg_core.c

+1 −1
Original line number Diff line number Diff line
@@ -442,7 +442,7 @@ static int rpmsg_dev_probe(struct device *dev) 
		goto out;

	}



	if (rpdev->ops->announce_create)

	if (ept && rpdev->ops->announce_create)

		err = rpdev->ops->announce_create(rpdev);

out:

	return err;

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