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>

5 files changed, 82 insertions, 158 deletions

diff --git a/drivers/pps/clients/pps-ktimer.c b/drivers/pps/clients/pps-ktimer.c
index e1bdd8bc8c9c..966ead188ee2 100644
--- a/drivers/pps/clients/pps-ktimer.c
+++ b/drivers/pps/clients/pps-ktimer.c
@@ -31,7 +31,7 @@
  * Global variables
  */
 
-static int source;
+static struct pps_device *pps;
 static struct timer_list ktimer;
 
 /*
@@ -47,7 +47,7 @@ static void pps_ktimer_event(unsigned long ptr)
 
         pr_info("PPS event at %lu\n", jiffies);
 
-        pps_event(source, &ts, PPS_CAPTUREASSERT, NULL);
+        pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
 
         mod_timer(&ktimer, jiffies + HZ);
 }
@@ -56,12 +56,11 @@ static void pps_ktimer_event(unsigned long ptr)
  * The echo function
  */
 
-static void pps_ktimer_echo(int source, int event, void *data)
+static void pps_ktimer_echo(struct pps_device *pps, int event, void *data)
 {
-        pr_info("echo %s %s for source %d\n",
+        dev_info(pps->dev, "echo %s %s\n",
                 event & PPS_CAPTUREASSERT ? "assert" : "",
-                event & PPS_CAPTURECLEAR ? "clear" : "",
-                source);
+                event & PPS_CAPTURECLEAR ? "clear" : "");
 }
 
 /*
@@ -84,30 +83,27 @@ static struct pps_source_info pps_ktimer_info = {
 
 static void __exit pps_ktimer_exit(void)
 {
-        del_timer_sync(&ktimer);
-        pps_unregister_source(source);
+        dev_info(pps->dev, "ktimer PPS source unregistered\n");
 
-        pr_info("ktimer PPS source unregistered\n");
+        del_timer_sync(&ktimer);
+        pps_unregister_source(pps);
 }
 
 static int __init pps_ktimer_init(void)
 {
-        int ret;
-
-        ret = pps_register_source(&pps_ktimer_info,
+        pps = pps_register_source(&pps_ktimer_info,
                                 PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
-        if (ret < 0) {
+        if (pps == NULL) {
                 printk(KERN_ERR "cannot register ktimer source\n");
-                return ret;
+                return -ENOMEM;
         }
-        source = ret;
 
         setup_timer(&ktimer, pps_ktimer_event, 0);
         mod_timer(&ktimer, jiffies + HZ);
 
-        pr_info("ktimer PPS source registered at %d\n", source);
+        dev_info(pps->dev, "ktimer PPS source registered\n");
 
-        return  0;
+        return 0;
 }
 
 module_init(pps_ktimer_init);
diff --git a/drivers/pps/clients/pps-ldisc.c b/drivers/pps/clients/pps-ldisc.c
index 20fc9f7645c8..1517f5498ec0 100644
--- a/drivers/pps/clients/pps-ldisc.c
+++ b/drivers/pps/clients/pps-ldisc.c
@@ -29,7 +29,7 @@
 static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status,
                                 struct pps_event_time *ts)
 {
-        int id = (long)tty->disc_data;
+        struct pps_device *pps = (struct pps_device *)tty->disc_data;
         struct pps_event_time __ts;
 
         /* First of all we get the time stamp... */
@@ -39,12 +39,14 @@ static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status,
         if (!ts)        /* No. Do it ourself! */
                 ts = &__ts;
 
+        BUG_ON(pps == NULL);
+
         /* Now do the PPS event report */
-        pps_event(id, ts, status ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR,
-                        NULL);
+        pps_event(pps, ts, status ? PPS_CAPTUREASSERT :
+                        PPS_CAPTURECLEAR, NULL);
 
-        pr_debug("PPS %s at %lu on source #%d\n",
-                        status ? "assert" : "clear", jiffies, id);
+        dev_dbg(pps->dev, "PPS %s at %lu\n",
+                        status ? "assert" : "clear", jiffies);
 }
 
 static int (*alias_n_tty_open)(struct tty_struct *tty);
@@ -54,6 +56,7 @@ static int pps_tty_open(struct tty_struct *tty)
         struct pps_source_info info;
         struct tty_driver *drv = tty->driver;
         int index = tty->index + drv->name_base;
+        struct pps_device *pps;
         int ret;
 
         info.owner = THIS_MODULE;
@@ -64,34 +67,42 @@ static int pps_tty_open(struct tty_struct *tty)
                         PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
                         PPS_CANWAIT | PPS_TSFMT_TSPEC;
 
-        ret = pps_register_source(&info, PPS_CAPTUREBOTH | \
+        pps = pps_register_source(&info, PPS_CAPTUREBOTH | \
                                 PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
-        if (ret < 0) {
+        if (pps == NULL) {
                 pr_err("cannot register PPS source \"%s\"\n", info.path);
-                return ret;
+                return -ENOMEM;
         }
-        tty->disc_data = (void *)(long)ret;
+        tty->disc_data = pps;
 
         /* Should open N_TTY ldisc too */
         ret = alias_n_tty_open(tty);
-        if (ret < 0)
-                pps_unregister_source((long)tty->disc_data);
+        if (ret < 0) {
+                pr_err("cannot open tty ldisc \"%s\"\n", info.path);
+                goto err_unregister;
+        }
 
-        pr_info("PPS source #%d \"%s\" added\n", ret, info.path);
+        dev_info(pps->dev, "source \"%s\" added\n", info.path);
 
         return 0;
+
+err_unregister:
+        tty->disc_data = NULL;
+        pps_unregister_source(pps);
+        return ret;
 }
 
 static void (*alias_n_tty_close)(struct tty_struct *tty);
 
 static void pps_tty_close(struct tty_struct *tty)
 {
-        int id = (long)tty->disc_data;
+        struct pps_device *pps = (struct pps_device *)tty->disc_data;
 
-        pps_unregister_source(id);
         alias_n_tty_close(tty);
 
-        pr_info("PPS source #%d removed\n", id);
+        tty->disc_data = NULL;
+        dev_info(pps->dev, "removed\n");
+        pps_unregister_source(pps);
 }
 
 static struct tty_ldisc_ops pps_ldisc_ops;
diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
index b431d83b824a..98d4012ca595 100644
--- a/drivers/pps/kapi.c
+++ b/drivers/pps/kapi.c
@@ -32,11 +32,11 @@
 #include <linux/slab.h>
 
 /*
- * Global variables
+ * Local variables
  */
 
-DEFINE_SPINLOCK(pps_idr_lock);
-DEFINE_IDR(pps_idr);
+static DEFINE_SPINLOCK(pps_idr_lock);
+static DEFINE_IDR(pps_idr);
 
 /*
  * Local functions
@@ -60,60 +60,6 @@ static void pps_add_offset(struct pps_ktime *ts, struct pps_ktime *offset)
  * Exported functions
  */
 
-/* pps_get_source - find a PPS source
- * @source: the PPS source ID.
- *
- * This function is used to find an already registered PPS source into the
- * system.
- *
- * The function returns NULL if found nothing, otherwise it returns a pointer
- * to the PPS source data struct (the refcounter is incremented by 1).
- */
-
-struct pps_device *pps_get_source(int source)
-{
-        struct pps_device *pps;
-        unsigned long flags;
-
-        spin_lock_irqsave(&pps_idr_lock, flags);
-
-        pps = idr_find(&pps_idr, source);
-        if (pps != NULL)
-                atomic_inc(&pps->usage);
-
-        spin_unlock_irqrestore(&pps_idr_lock, flags);
-
-        return pps;
-}
-
-/* pps_put_source - free the PPS source data
- * @pps: a pointer to the PPS source.
- *
- * This function is used to free a PPS data struct if its refcount is 0.
- */
-
-void pps_put_source(struct pps_device *pps)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&pps_idr_lock, flags);
-        BUG_ON(atomic_read(&pps->usage) == 0);
-
-        if (!atomic_dec_and_test(&pps->usage)) {
-                pps = NULL;
-                goto exit;
-        }
-
-        /* No more reference to the PPS source. We can safely remove the
-         * PPS data struct.
-         */
-        idr_remove(&pps_idr, pps->id);
-
-exit:
-        spin_unlock_irqrestore(&pps_idr_lock, flags);
-        kfree(pps);
-}
-
 /* pps_register_source - add a PPS source in the system
  * @info: the PPS info struct
  * @default_params: the default PPS parameters of the new source
@@ -122,10 +68,11 @@ exit:
  * source is described by info's fields and it will have, as default PPS
  * parameters, the ones specified into default_params.
  *
- * The function returns, in case of success, the PPS source ID.
+ * The function returns, in case of success, the PPS device. Otherwise NULL.
  */
 
-int pps_register_source(struct pps_source_info *info, int default_params)
+struct pps_device *pps_register_source(struct pps_source_info *info,
+                int default_params)
 {
         struct pps_device *pps;
         int id;
@@ -168,7 +115,6 @@ int pps_register_source(struct pps_source_info *info, int default_params)
 
         init_waitqueue_head(&pps->queue);
         spin_lock_init(&pps->lock);
-        atomic_set(&pps->usage, 1);
 
         /* Get new ID for the new PPS source */
         if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
@@ -211,7 +157,7 @@ int pps_register_source(struct pps_source_info *info, int default_params)
 
         pr_info("new PPS source %s at ID %d\n", info->name, id);
 
-        return id;
+        return pps;
 
 free_idr:
         spin_lock_irq(&pps_idr_lock);
@@ -224,38 +170,33 @@ kfree_pps:
 pps_register_source_exit:
         printk(KERN_ERR "pps: %s: unable to register source\n", info->name);
 
-        return err;
+        return NULL;
 }
 EXPORT_SYMBOL(pps_register_source);
 
 /* pps_unregister_source - remove a PPS source from the system
- * @source: the PPS source ID
+ * @pps: the PPS source
  *
  * This function is used to remove a previously registered PPS source from
  * the system.
  */
 
-void pps_unregister_source(int source)
+void pps_unregister_source(struct pps_device *pps)
 {
-        struct pps_device *pps;
+        unsigned int id = pps->id;
 
-        spin_lock_irq(&pps_idr_lock);
-        pps = idr_find(&pps_idr, source);
+        pps_unregister_cdev(pps);
 
-        if (!pps) {
-                BUG();
-                spin_unlock_irq(&pps_idr_lock);
-                return;
-        }
+        spin_lock_irq(&pps_idr_lock);
+        idr_remove(&pps_idr, pps->id);
         spin_unlock_irq(&pps_idr_lock);
 
-        pps_unregister_cdev(pps);
-        pps_put_source(pps);
+        kfree(pps);
 }
 EXPORT_SYMBOL(pps_unregister_source);
 
 /* pps_event - register a PPS event into the system
- * @source: the PPS source ID
+ * @pps: the PPS device
  * @ts: the event timestamp
  * @event: the event type
  * @data: userdef pointer
@@ -263,30 +204,24 @@ EXPORT_SYMBOL(pps_unregister_source);
  * This function is used by each PPS client in order to register a new
  * PPS event into the system (it's usually called inside an IRQ handler).
  *
- * If an echo function is associated with the PPS source it will be called
+ * If an echo function is associated with the PPS device it will be called
  * as:
- *      pps->info.echo(source, event, data);
+ *      pps->info.echo(pps, event, data);
  */
-
-void pps_event(int source, struct pps_event_time *ts, int event, void *data)
+void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
+                void *data)
 {
-        struct pps_device *pps;
         unsigned long flags;
         int captured = 0;
         struct pps_ktime ts_real;
 
         if ((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0) {
-                printk(KERN_ERR "pps: unknown event (%x) for source %d\n",
-                        event, source);
+                dev_err(pps->dev, "unknown event (%x)\n", event);
                 return;
         }
 
-        pps = pps_get_source(source);
-        if (!pps)
-                return;
-
-        pr_debug("PPS event on source %d at %ld.%09ld\n",
-                        pps->id, ts->ts_real.tv_sec, ts->ts_real.tv_nsec);
+        dev_dbg(pps->dev, "PPS event at %ld.%09ld\n",
+                        ts->ts_real.tv_sec, ts->ts_real.tv_nsec);
 
         timespec_to_pps_ktime(&ts_real, ts->ts_real);
 
@@ -294,7 +229,7 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data)
 
         /* Must call the echo function? */
         if ((pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)))
-                pps->info.echo(source, event, data);
+                pps->info.echo(pps, event, data);
 
         /* Check the event */
         pps->current_mode = pps->params.mode;
@@ -308,8 +243,8 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data)
                 /* Save the time stamp */
                 pps->assert_tu = ts_real;
                 pps->assert_sequence++;
-                pr_debug("capture assert seq #%u for source %d\n",
-                        pps->assert_sequence, source);
+                dev_dbg(pps->dev, "capture assert seq #%u\n",
+                        pps->assert_sequence);
 
                 captured = ~0;
         }
@@ -323,8 +258,8 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data)
                 /* Save the time stamp */
                 pps->clear_tu = ts_real;
                 pps->clear_sequence++;
-                pr_debug("capture clear seq #%u for source %d\n",
-                        pps->clear_sequence, source);
+                dev_dbg(pps->dev, "capture clear seq #%u\n",
+                        pps->clear_sequence);
 
                 captured = ~0;
         }
@@ -338,8 +273,5 @@ void pps_event(int source, struct pps_event_time *ts, int event, void *data)
         }
 
         spin_unlock_irqrestore(&pps->lock, flags);
-
-        /* Now we can release the PPS source for (possible) deregistration */
-        pps_put_source(pps);
 }
 EXPORT_SYMBOL(pps_event);
diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
index dc7e66cb2762..1922f27a52ac 100644
--- a/drivers/pps/pps.c
+++ b/drivers/pps/pps.c
@@ -204,12 +204,6 @@ static int pps_cdev_open(struct inode *inode, struct file *file)
 {
         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_open(struct inode *inode, struct file *file)
 
 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 @@ static const struct file_operations pps_cdev_fops = {
 int pps_register_cdev(struct pps_device *pps)
 {
         int err;
+        dev_t devt;
+
+        devt = MKDEV(MAJOR(pps_devt), pps->id);
 
-        pps->devno = 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 @@ del_cdev:
 
 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);
 }
 
diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h
index 32aa6763ca1b..1aedf50088cf 100644
--- a/include/linux/pps_kernel.h
+++ b/include/linux/pps_kernel.h
@@ -31,13 +31,16 @@
  * Global defines
  */
 
+struct pps_device;
+
 /* The specific PPS source info */
 struct pps_source_info {
         char name[PPS_MAX_NAME_LEN];            /* simbolic name */
         char path[PPS_MAX_NAME_LEN];            /* path of connected device */
         int mode;                               /* PPS's allowed mode */
 
-        void (*echo)(int source, int event, void *data); /* PPS echo function */
+        void (*echo)(struct pps_device *pps,
+                        int event, void *data); /* PPS echo function */
 
         struct module *owner;
         struct device *dev;
@@ -65,35 +68,27 @@ struct pps_device {
         unsigned int id;                        /* PPS source unique ID */
         struct cdev cdev;
         struct device *dev;
-        int devno;
         struct fasync_struct *async_queue;      /* fasync method */
         spinlock_t lock;
-
-        atomic_t usage;                         /* usage count */
 };
 
 /*
  * Global variables
  */
 
-extern spinlock_t pps_idr_lock;
-extern struct idr pps_idr;
-
 extern struct device_attribute pps_attrs[];
 
 /*
  * Exported functions
  */
 
-struct pps_device *pps_get_source(int source);
-extern void pps_put_source(struct pps_device *pps);
-extern int pps_register_source(struct pps_source_info *info,
-                                int default_params);
-extern void pps_unregister_source(int source);
+extern struct pps_device *pps_register_source(
+                struct pps_source_info *info, int default_params);
+extern void pps_unregister_source(struct pps_device *pps);
 extern int pps_register_cdev(struct pps_device *pps);
 extern void pps_unregister_cdev(struct pps_device *pps);
-extern void pps_event(int source, struct pps_event_time *ts, int event,
-                void *data);
+extern void pps_event(struct pps_device *pps,
+                struct pps_event_time *ts, int event, void *data);
 
 static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
                 struct timespec ts)