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Diffstat (limited to 'drivers/pps')
-rw-r--r--drivers/pps/kapi.c56
-rw-r--r--drivers/pps/pps.c50
2 files changed, 52 insertions, 54 deletions
diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
index e8847c118ea3..c42d3cb8baa1 100644
--- a/drivers/pps/kapi.c
+++ b/drivers/pps/kapi.c
@@ -27,19 +27,11 @@
#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
*/
@@ -76,7 +68,6 @@ struct pps_device *pps_register_source(struct pps_source_info *info,
int default_params)
{
struct pps_device *pps;
- int id;
int err;
/* Sanity checks */
@@ -117,54 +108,18 @@ struct pps_device *pps_register_source(struct pps_source_info *info,
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);
@@ -184,15 +139,10 @@ EXPORT_SYMBOL(pps_register_source);
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);
diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
index 9f7c2e858dd0..79b445578132 100644
--- a/drivers/pps/pps.c
+++ b/drivers/pps/pps.c
@@ -30,6 +30,7 @@
#include <linux/cdev.h>
#include <linux/poll.h>
#include <linux/pps_kernel.h>
+#include <linux/slab.h>
/*
* Local variables
@@ -38,6 +39,9 @@
static dev_t pps_devt;
static struct class *pps_class;
+static DEFINE_SPINLOCK(pps_idr_lock);
+static DEFINE_IDR(pps_idr);
+
/*
* Char device methods
*/
@@ -229,11 +233,48 @@ static const struct file_operations pps_cdev_fops = {
.release = pps_cdev_release,
};
+static void pps_device_destruct(struct device *dev)
+{
+ struct pps_device *pps = dev_get_drvdata(dev);
+
+ /* release id here to protect others from using it while it's
+ * still in use */
+ spin_lock_irq(&pps_idr_lock);
+ idr_remove(&pps_idr, pps->id);
+ spin_unlock_irq(&pps_idr_lock);
+
+ kfree(dev);
+ kfree(pps);
+}
+
int pps_register_cdev(struct pps_device *pps)
{
int err;
dev_t devt;
+ /* Get new ID for the new PPS source */
+ if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0)
+ return -ENOMEM;
+
+ /* Now really allocate the PPS source.
+ * After idr_get_new() calling the new source will be freely available
+ * into the kernel.
+ */
+ spin_lock_irq(&pps_idr_lock);
+ err = idr_get_new(&pps_idr, pps, &pps->id);
+ spin_unlock_irq(&pps_idr_lock);
+
+ if (err < 0)
+ return err;
+
+ pps->id &= MAX_ID_MASK;
+ if (pps->id >= PPS_MAX_SOURCES) {
+ pr_err("%s: too many PPS sources in the system\n",
+ pps->info.name);
+ err = -EBUSY;
+ goto free_idr;
+ }
+
devt = MKDEV(MAJOR(pps_devt), pps->id);
cdev_init(&pps->cdev, &pps_cdev_fops);
@@ -243,13 +284,15 @@ int pps_register_cdev(struct pps_device *pps)
if (err) {
pr_err("%s: failed to add char device %d:%d\n",
pps->info.name, MAJOR(pps_devt), pps->id);
- return err;
+ goto free_idr;
}
pps->dev = device_create(pps_class, pps->info.dev, devt, pps,
"pps%d", pps->id);
if (IS_ERR(pps->dev))
goto del_cdev;
+ pps->dev->release = pps_device_destruct;
+
pr_debug("source %s got cdev (%d:%d)\n", pps->info.name,
MAJOR(pps_devt), pps->id);
@@ -258,6 +301,11 @@ int pps_register_cdev(struct pps_device *pps)
del_cdev:
cdev_del(&pps->cdev);
+free_idr:
+ spin_lock_irq(&pps_idr_lock);
+ idr_remove(&pps_idr, pps->id);
+ spin_unlock_irq(&pps_idr_lock);
+
return err;
}