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Commit 7eda8b8e authored by Samuel Ortiz's avatar Samuel Ortiz
Browse files

NFC: Use IDR library to assing NFC devices IDs 



As a consequence the NFC device IDs won't be increasing all the time,
as IDR provides the first available ID.

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent ab34a181

include/net/nfc/nfc.h

+1 −1
Original line number Diff line number Diff line
@@ -95,7 +95,7 @@ struct nfc_genl_data { 
};



struct nfc_dev {

	unsigned int idx;

	int idx;

	u32 target_next_idx;

	struct nfc_target *targets;

	int n_targets;

net/nfc/core.c

+16 −7
Original line number Diff line number Diff line
@@ -40,6 +40,9 @@ 
int nfc_devlist_generation;

DEFINE_MUTEX(nfc_devlist_mutex);



/* NFC device ID bitmap */

static DEFINE_IDA(nfc_index_ida);



/**

 * nfc_dev_up - turn on the NFC device

 *
@@ -760,7 +763,6 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, 
				    u32 supported_protocols,

				    int tx_headroom, int tx_tailroom)

{

	static atomic_t dev_no = ATOMIC_INIT(0);

	struct nfc_dev *dev;



	if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
@@ -774,11 +776,6 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, 
	if (!dev)

		return NULL;



	dev->dev.class = &nfc_class;

	dev->idx = atomic_inc_return(&dev_no) - 1;

	dev_set_name(&dev->dev, "nfc%d", dev->idx);

	device_initialize(&dev->dev);



	dev->ops = ops;

	dev->supported_protocols = supported_protocols;

	dev->tx_headroom = tx_headroom;
@@ -814,6 +811,14 @@ int nfc_register_device(struct nfc_dev *dev) 


	pr_debug("dev_name=%s\n", dev_name(&dev->dev));



	dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);

	if (dev->idx < 0)

		return dev->idx;



	dev->dev.class = &nfc_class;

	dev_set_name(&dev->dev, "nfc%d", dev->idx);

	device_initialize(&dev->dev);



	mutex_lock(&nfc_devlist_mutex);

	nfc_devlist_generation++;

	rc = device_add(&dev->dev);
@@ -842,10 +847,12 @@ EXPORT_SYMBOL(nfc_register_device); 
 */

void nfc_unregister_device(struct nfc_dev *dev)

{

	int rc;

	int rc, id;



	pr_debug("dev_name=%s\n", dev_name(&dev->dev));



	id = dev->idx;



	mutex_lock(&nfc_devlist_mutex);

	nfc_devlist_generation++;
@@ -864,6 +871,8 @@ void nfc_unregister_device(struct nfc_dev *dev) 
		pr_debug("The userspace won't be notified that the device %s was removed\n",

			 dev_name(&dev->dev));



	ida_simple_remove(&nfc_index_ida, id);



}

EXPORT_SYMBOL(nfc_unregister_device);