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NFC: Use IDR library to assing NFC devices IDs

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

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-10-22 15:57:58 +02:00
parent ab34a1813c
commit 7eda8b8e96
2 changed files with 17 additions and 8 deletions
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2
include/net/nfc/nfc.h
View File

@ -95,7 +95,7 @@ struct nfc_genl_data {
}; };
struct nfc_dev { struct nfc_dev {
unsigned int idx; int idx;
u32 target_next_idx; u32 target_next_idx;
struct nfc_target *targets; struct nfc_target *targets;
int n_targets; int n_targets;

23
net/nfc/core.c
View File

@ -40,6 +40,9 @@
int nfc_devlist_generation; int nfc_devlist_generation;
DEFINE_MUTEX(nfc_devlist_mutex); DEFINE_MUTEX(nfc_devlist_mutex);
/* NFC device ID bitmap */
static DEFINE_IDA(nfc_index_ida);
/** /**
* nfc_dev_up - turn on the NFC device * 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, u32 supported_protocols,
int tx_headroom, int tx_tailroom) int tx_headroom, int tx_tailroom)
{ {
static atomic_t dev_no = ATOMIC_INIT(0);
struct nfc_dev *dev; struct nfc_dev *dev;
if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || 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) if (!dev)
return NULL; 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->ops = ops;
dev->supported_protocols = supported_protocols; dev->supported_protocols = supported_protocols;
dev->tx_headroom = tx_headroom; 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)); 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); mutex_lock(&nfc_devlist_mutex);
nfc_devlist_generation++; nfc_devlist_generation++;
rc = device_add(&dev->dev); rc = device_add(&dev->dev);
@ -842,10 +847,12 @@ EXPORT_SYMBOL(nfc_register_device);
*/ */
void nfc_unregister_device(struct nfc_dev *dev) void nfc_unregister_device(struct nfc_dev *dev)
{ {
int rc; int rc, id;
pr_debug("dev_name=%s\n", dev_name(&dev->dev)); pr_debug("dev_name=%s\n", dev_name(&dev->dev));
id = dev->idx;
mutex_lock(&nfc_devlist_mutex); mutex_lock(&nfc_devlist_mutex);
nfc_devlist_generation++; 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", pr_debug("The userspace won't be notified that the device %s was removed\n",
dev_name(&dev->dev)); dev_name(&dev->dev));
ida_simple_remove(&nfc_index_ida, id);
} }
EXPORT_SYMBOL(nfc_unregister_device); EXPORT_SYMBOL(nfc_unregister_device);