diff options
Diffstat (limited to 'src/devices/device.c')
| -rw-r--r-- | src/devices/device.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/src/devices/device.c b/src/devices/device.c index ebac1a073e..fafa59924e 100644 --- a/src/devices/device.c +++ b/src/devices/device.c @@ -66,12 +66,10 @@ DECLARE_SPIN_LOCK(dev_lock) * * @see device_path */ -device_t alloc_dev(struct bus *parent, struct device_path *path) +static device_t __alloc_dev(struct bus *parent, struct device_path *path) { device_t dev, child; - spin_lock(&dev_lock); - /* Find the last child of our parent. */ for (child = parent->children; child && child->sibling; /* */ ) child = child->sibling; @@ -99,11 +97,37 @@ device_t alloc_dev(struct bus *parent, struct device_path *path) last_dev->next = dev; last_dev = dev; + return dev; +} + +device_t alloc_dev(struct bus *parent, struct device_path *path) +{ + device_t dev; + spin_lock(&dev_lock); + dev = __alloc_dev(parent, path); spin_unlock(&dev_lock); return dev; } /** + * See if a device structure already exists and if not allocate it. + * + * @param parent The bus to find the device on. + * @param path The relative path from the bus to the appropriate device. + * @return Pointer to a device structure for the device on bus at path. + */ +device_t alloc_find_dev(struct bus *parent, struct device_path *path) +{ + device_t child; + spin_lock(&dev_lock); + child = find_dev_path(parent, path); + if (!child) + child = __alloc_dev(parent, path); + spin_unlock(&dev_lock); + return child; +} + +/** * Round a number up to an alignment. * * @param val The starting value. |