Rationalize fasync return values

Most fasync implementations do something like:

     return fasync_helper(...);

But fasync_helper() will return a positive value at times - a feature used
in at least one place.  Thus, a number of other drivers do:

     err = fasync_helper(...);
     if (err < 0)
             return err;
     return 0;

In the interests of consistency and more concise code, it makes sense to
map positive return values onto zero where ->fasync() is called.

Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

4 files changed, 4 insertions, 15 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index ed8baa0aec3c..7a7a026ba712 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -94,11 +94,8 @@ static void evdev_event(struct input_handle *handle,
 static int evdev_fasync(int fd, struct file *file, int on)
 {
         struct evdev_client *client = file->private_data;
-        int retval;
-
-        retval = fasync_helper(fd, file, on, &client->fasync);
 
-        return retval < 0 ? retval : 0;
+        return fasync_helper(fd, file, on, &client->fasync);
 }
 
 static int evdev_flush(struct file *file, fl_owner_t id)
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
index 6f2366220a50..4224f0112849 100644
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -159,12 +159,9 @@ static void joydev_event(struct input_handle *handle,
 
 static int joydev_fasync(int fd, struct file *file, int on)
 {
-        int retval;
         struct joydev_client *client = file->private_data;
 
-        retval = fasync_helper(fd, file, on, &client->fasync);
-
-        return retval < 0 ? retval : 0;
+        return fasync_helper(fd, file, on, &client->fasync);
 }
 
 static void joydev_free(struct device *dev)
diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index ef99a7e6d40c..17fd6d46d082 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -403,12 +403,9 @@ static void mousedev_event(struct input_handle *handle,
 
 static int mousedev_fasync(int fd, struct file *file, int on)
 {
-        int retval;
         struct mousedev_client *client = file->private_data;
 
-        retval = fasync_helper(fd, file, on, &client->fasync);
-
-        return retval < 0 ? retval : 0;
+        return fasync_helper(fd, file, on, &client->fasync);
 }
 
 static void mousedev_free(struct device *dev)
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c
index 06bbd0e74c6f..b03009bb7468 100644
--- a/drivers/input/serio/serio_raw.c
+++ b/drivers/input/serio/serio_raw.c
@@ -58,10 +58,8 @@ static unsigned int serio_raw_no;
 static int serio_raw_fasync(int fd, struct file *file, int on)
 {
         struct serio_raw_list *list = file->private_data;
-        int retval;
 
-        retval = fasync_helper(fd, file, on, &list->fasync);
-        return retval < 0 ? retval : 0;
+        return fasync_helper(fd, file, on, &list->fasync);
 }
 
 static struct serio_raw *serio_raw_locate(int minor)