pps: access pps device by direct pointer
Using device index as a pointer needs some unnecessary work to be done
every time the pointer is needed (in irq handler for example). Using a
direct pointer is much more easy (and safe as well).
Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Acked-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
index dc7e66c..1922f27 100644
--- a/drivers/pps/pps.c
+++ b/drivers/pps/pps.c
@@ -204,12 +204,6 @@
{
struct pps_device *pps = container_of(inode->i_cdev,
struct pps_device, cdev);
- int found;
-
- found = pps_get_source(pps->id) != 0;
- if (!found)
- return -ENODEV;
-
file->private_data = pps;
return 0;
@@ -217,11 +211,6 @@
static int pps_cdev_release(struct inode *inode, struct file *file)
{
- struct pps_device *pps = file->private_data;
-
- /* Free the PPS source and wake up (possible) deregistration */
- pps_put_source(pps);
-
return 0;
}
@@ -242,22 +231,23 @@
int pps_register_cdev(struct pps_device *pps)
{
int err;
+ dev_t devt;
- pps->devno = MKDEV(MAJOR(pps_devt), pps->id);
+ devt = MKDEV(MAJOR(pps_devt), pps->id);
+
cdev_init(&pps->cdev, &pps_cdev_fops);
pps->cdev.owner = pps->info.owner;
- err = cdev_add(&pps->cdev, pps->devno, 1);
+ err = cdev_add(&pps->cdev, devt, 1);
if (err) {
printk(KERN_ERR "pps: %s: failed to add char device %d:%d\n",
pps->info.name, MAJOR(pps_devt), pps->id);
return err;
}
- pps->dev = device_create(pps_class, pps->info.dev, pps->devno, NULL,
+ pps->dev = device_create(pps_class, pps->info.dev, devt, pps,
"pps%d", pps->id);
if (IS_ERR(pps->dev))
goto del_cdev;
- dev_set_drvdata(pps->dev, pps);
pr_debug("source %s got cdev (%d:%d)\n", pps->info.name,
MAJOR(pps_devt), pps->id);
@@ -272,7 +262,7 @@
void pps_unregister_cdev(struct pps_device *pps)
{
- device_destroy(pps_class, pps->devno);
+ device_destroy(pps_class, pps->dev->devt);
cdev_del(&pps->cdev);
}