pps: Add pps_lookup_dev() function

The PPS serial line discipline wants to attach a PPS device to a tty
without changing the tty code to add a struct pps_device * pointer.

Since the number of PPS devices in a typical system is generally very low
(n=1 is by far the most common), it's practical to search the entire list
of allocated pps devices.  (We capture the timestamp before the lookup,
so the timing isn't affected.)

It is a bit ugly that this function, which is part of the in-kernel
PPS API, has to be in pps.c as opposed to kapi,c, but that's not
something that affects users.

Signed-off-by: George Spelvin <linux@horizon.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 47 insertions, 3 deletions

diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
index 2420d5af0583..a70e384262e5 100644
--- a/drivers/pps/pps.c
+++ b/drivers/pps/pps.c
@@ -352,11 +352,44 @@ free_idr:
 
 void pps_unregister_cdev(struct pps_device *pps)
 {
+        pps->lookup_cookie = NULL;
         device_destroy(pps_class, pps->dev->devt);
         cdev_del(&pps->cdev);
 }
 
 /*
+ * Look up a pps device by magic cookie.
+ * The cookie is usually a pointer to some enclosing device, but this
+ * code doesn't care; you should never be dereferencing it.
+ *
+ * This is a bit of a kludge that is currently used only by the PPS
+ * serial line discipline.  It may need to be tweaked when a second user
+ * is found.
+ *
+ * There is no function interface for setting the lookup_cookie field.
+ * It's initialized to NULL when the pps device is created, and if a
+ * client wants to use it, just fill it in afterward.
+ *
+ * The cookie is automatically set to NULL in pps_unregister_source()
+ * so that it will not be used again, even if the pps device cannot
+ * be removed from the idr due to pending references holding the minor
+ * number in use.
+ */
+struct pps_device *pps_lookup_dev(void const *cookie)
+{
+        struct pps_device *pps;
+        unsigned id;
+
+        rcu_read_lock();
+        idr_for_each_entry(&pps_idr, pps, id)
+                if (cookie == pps->lookup_cookie)
+                        break;
+        rcu_read_unlock();
+        return pps;
+}
+EXPORT_SYMBOL(pps_lookup_dev);
+
+/*
  * Module stuff
  */
 
diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h
index 0cc45ae1afd5..7db3eb93a079 100644
--- a/include/linux/pps_kernel.h
+++ b/include/linux/pps_kernel.h
@@ -43,7 +43,7 @@ struct pps_source_info {
                         int event, void *data); /* PPS echo function */
 
         struct module *owner;
-        struct device *dev;
+        struct device *dev;             /* Parent device for device_create */
 };
 
 struct pps_event_time {
@@ -69,6 +69,7 @@ struct pps_device {
         wait_queue_head_t queue;                /* PPS event queue */
 
         unsigned int id;                        /* PPS source unique ID */
+        void const *lookup_cookie;              /* pps_lookup_dev only */
         struct cdev cdev;
         struct device *dev;
         struct fasync_struct *async_queue;      /* fasync method */
@@ -82,16 +83,26 @@ struct pps_device {
 extern struct device_attribute pps_attrs[];
 
 /*
+ * Internal functions.
+ *
+ * These are not actually part of the exported API, but this is a
+ * convenient header file to put them in.
+ */
+
+extern int pps_register_cdev(struct pps_device *pps);
+extern void pps_unregister_cdev(struct pps_device *pps);
+
+/*
  * Exported functions
  */
 
 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(struct pps_device *pps,
                 struct pps_event_time *ts, int event, void *data);
+/* Look up a pps device by magic cookie */
+struct pps_device *pps_lookup_dev(void const *cookie);
 
 static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
                 struct timespec ts)