#include <linux/sched.h>
#include <linux/time.h>
#include <linux/spinlock.h>
-#include <linux/idr.h>
#include <linux/fs.h>
#include <linux/pps_kernel.h>
#include <linux/slab.h>
-/*
- * Local variables
- */
-
-static DEFINE_SPINLOCK(pps_idr_lock);
-static DEFINE_IDR(pps_idr);
-
/*
* Local functions
*/
int default_params)
{
struct pps_device *pps;
- int id;
int err;
/* Sanity checks */
init_waitqueue_head(&pps->queue);
spin_lock_init(&pps->lock);
- /* Get new ID for the new PPS source */
- if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
- err = -ENOMEM;
- goto kfree_pps;
- }
-
- spin_lock_irq(&pps_idr_lock);
-
- /* Now really allocate the PPS source.
- * After idr_get_new() calling the new source will be freely available
- * into the kernel.
- */
- err = idr_get_new(&pps_idr, pps, &id);
- if (err < 0) {
- spin_unlock_irq(&pps_idr_lock);
- goto kfree_pps;
- }
-
- id = id & MAX_ID_MASK;
- if (id >= PPS_MAX_SOURCES) {
- spin_unlock_irq(&pps_idr_lock);
-
- pr_err("%s: too many PPS sources in the system\n",
- info->name);
- err = -EBUSY;
- goto free_idr;
- }
- pps->id = id;
-
- spin_unlock_irq(&pps_idr_lock);
-
/* Create the char device */
err = pps_register_cdev(pps);
if (err < 0) {
pr_err("%s: unable to create char device\n",
info->name);
- goto free_idr;
+ goto kfree_pps;
}
dev_info(pps->dev, "new PPS source %s\n", info->name);
return pps;
-free_idr:
- spin_lock_irq(&pps_idr_lock);
- idr_remove(&pps_idr, id);
- spin_unlock_irq(&pps_idr_lock);
-
kfree_pps:
kfree(pps);
void pps_unregister_source(struct pps_device *pps)
{
- unsigned int id = pps->id;
-
pps_unregister_cdev(pps);
- spin_lock_irq(&pps_idr_lock);
- idr_remove(&pps_idr, pps->id);
- spin_unlock_irq(&pps_idr_lock);
-
- kfree(pps);
+ /* don't have to kfree(pps) here because it will be done on
+ * device destruction */
}
EXPORT_SYMBOL(pps_unregister_source);