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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2011-10-10 18:31:04 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2011-10-10 18:35:13 -0700
commit85f5b35da86bcd63dd27f0976176169727f96da4 (patch)
tree0e486981ec3f8b9783c06bb3955476012538e268 /drivers/input/serio
parent15a564d8dbfc9429540c2d9b38a64d1909de8b24 (diff)
Input: serio_raw - explicitly mark disconnected ports as dead
Instead of relying on setting serio_raw->serio to NULL upon disconnecting ports mark them explicitly as "dead". Also take and carry reference to underlying serio port to make sure it does not go away until we are done with it. Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/serio')
-rw-r--r--drivers/input/serio/serio_raw.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c
index 64fcefb50fbe..30ff96388198 100644
--- a/drivers/input/serio/serio_raw.c
+++ b/drivers/input/serio/serio_raw.c
@@ -40,6 +40,7 @@ struct serio_raw {
wait_queue_head_t wait;
struct list_head client_list;
struct list_head node;
+ bool dead;
};
struct serio_raw_client {
@@ -91,7 +92,7 @@ static int serio_raw_open(struct inode *inode, struct file *file)
goto out;
}
- if (!serio_raw->serio) {
+ if (serio_raw->dead) {
retval = -ENODEV;
goto out;
}
@@ -123,6 +124,8 @@ static void serio_raw_cleanup(struct kref *kref)
misc_deregister(&serio_raw->dev);
list_del_init(&serio_raw->node);
+
+ put_device(&serio_raw->serio->dev);
kfree(serio_raw);
}
@@ -164,19 +167,18 @@ static ssize_t serio_raw_read(struct file *file, char __user *buffer,
char uninitialized_var(c);
ssize_t retval = 0;
- if (!serio_raw->serio)
+ if (serio_raw->dead)
return -ENODEV;
if (serio_raw->head == serio_raw->tail && (file->f_flags & O_NONBLOCK))
return -EAGAIN;
retval = wait_event_interruptible(serio_raw->wait,
- serio_raw->head != serio_raw->tail ||
- !serio_raw->serio);
+ serio_raw->head != serio_raw->tail || serio_raw->dead);
if (retval)
return retval;
- if (!serio_raw->serio)
+ if (serio_raw->dead)
return -ENODEV;
while (retval < count && serio_raw_fetch_byte(serio_raw, &c)) {
@@ -201,7 +203,7 @@ static ssize_t serio_raw_write(struct file *file, const char __user *buffer,
if (retval)
return retval;
- if (!serio_raw->serio) {
+ if (serio_raw->dead) {
retval = -ENODEV;
goto out;
}
@@ -291,10 +293,12 @@ static int serio_raw_connect(struct serio *serio, struct serio_driver *drv)
snprintf(serio_raw->name, sizeof(serio_raw->name),
"serio_raw%d", serio_raw_no++);
kref_init(&serio_raw->kref);
- serio_raw->serio = serio;
INIT_LIST_HEAD(&serio_raw->client_list);
init_waitqueue_head(&serio_raw->wait);
+ serio_raw->serio = serio;
+ get_device(&serio->dev);
+
serio_set_drvdata(serio, serio_raw);
err = serio_open(serio, drv);
@@ -330,6 +334,7 @@ out_close:
list_del_init(&serio_raw->node);
out_free:
serio_set_drvdata(serio, NULL);
+ put_device(&serio->dev);
kfree(serio_raw);
out:
mutex_unlock(&serio_raw_mutex);
@@ -365,7 +370,7 @@ static void serio_raw_disconnect(struct serio *serio)
serio_close(serio);
serio_set_drvdata(serio, NULL);
- serio_raw->serio = NULL;
+ serio_raw->dead = true;
wake_up_interruptible(&serio_raw->wait);
kref_put(&serio_raw->kref, serio_raw_cleanup);