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authorJonathan Corbet <corbet@lwn.net>2009-02-01 14:52:56 -0700
committerJonathan Corbet <corbet@lwn.net>2009-03-16 08:34:35 -0600
commit60aa49243d09afc873f082567d2e3c16634ced84 (patch)
treebb7c8d9668b35a3aa4e90d0a62500ac9d3e67f7f
parent76398425bb06b07cc3a3b1ce169c67dc9d6874ed (diff)
downloadlinux-2.6.34-ux500-60aa49243d09afc873f082567d2e3c16634ced84.tar.gz
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>
-rw-r--r--drivers/char/sonypi.c7
-rw-r--r--drivers/gpu/drm/drm_fops.c6
-rw-r--r--drivers/hid/usbhid/hiddev.c5
-rw-r--r--drivers/ieee1394/dv1394.c6
-rw-r--r--drivers/input/evdev.c5
-rw-r--r--drivers/input/joydev.c5
-rw-r--r--drivers/input/mousedev.c5
-rw-r--r--drivers/input/serio/serio_raw.c4
-rw-r--r--drivers/net/wan/cosa.c4
-rw-r--r--drivers/platform/x86/sony-laptop.c7
-rw-r--r--drivers/scsi/sg.c4
-rw-r--r--fs/fcntl.c2
-rw-r--r--fs/ioctl.c2
-rw-r--r--fs/pipe.c16
-rw-r--r--sound/core/control.c7
-rw-r--r--sound/core/pcm_native.c4
-rw-r--r--sound/core/timer.c6
17 files changed, 22 insertions, 73 deletions
diff --git a/drivers/char/sonypi.c b/drivers/char/sonypi.c
index f4374437a03..fd3dced9777 100644
--- a/drivers/char/sonypi.c
+++ b/drivers/char/sonypi.c
@@ -888,12 +888,7 @@ found:
static int sonypi_misc_fasync(int fd, struct file *filp, int on)
{
- int retval;
-
- retval = fasync_helper(fd, filp, on, &sonypi_device.fifo_async);
- if (retval < 0)
- return retval;
- return 0;
+ return fasync_helper(fd, filp, on, &sonypi_device.fifo_async);
}
static int sonypi_misc_release(struct inode *inode, struct file *file)
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index f52663ebe01..e13cb62bbae 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -337,14 +337,10 @@ int drm_fasync(int fd, struct file *filp, int on)
{
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->minor->dev;
- int retcode;
DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
(long)old_encode_dev(priv->minor->device));
- retcode = fasync_helper(fd, filp, on, &dev->buf_async);
- if (retcode < 0)
- return retcode;
- return 0;
+ return fasync_helper(fd, filp, on, &dev->buf_async);
}
EXPORT_SYMBOL(drm_fasync);
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 4940e4d70c2..3a7b4fe192a 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -227,12 +227,9 @@ void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
*/
static int hiddev_fasync(int fd, struct file *file, int on)
{
- int retval;
struct hiddev_list *list = file->private_data;
- retval = fasync_helper(fd, file, on, &list->fasync);
-
- return retval < 0 ? retval : 0;
+ return fasync_helper(fd, file, on, &list->fasync);
}
diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c
index 3838bc4acab..cb15bfa38d7 100644
--- a/drivers/ieee1394/dv1394.c
+++ b/drivers/ieee1394/dv1394.c
@@ -1325,11 +1325,7 @@ static int dv1394_fasync(int fd, struct file *file, int on)
struct video_card *video = file_to_video_card(file);
- int retval = fasync_helper(fd, file, on, &video->fasync);
-
- if (retval < 0)
- return retval;
- return 0;
+ return fasync_helper(fd, file, on, &video->fasync);
}
static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index ed8baa0aec3..7a7a026ba71 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 6f2366220a5..4224f011284 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 ef99a7e6d40..17fd6d46d08 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 06bbd0e74c6..b03009bb746 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)
diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
index d80b72e22de..ce753e9c576 100644
--- a/drivers/net/wan/cosa.c
+++ b/drivers/net/wan/cosa.c
@@ -993,8 +993,8 @@ static struct fasync_struct *fasync[256] = { NULL, };
static int cosa_fasync(struct inode *inode, struct file *file, int on)
{
int port = iminor(inode);
- int rv = fasync_helper(inode, file, on, &fasync[port]);
- return rv < 0 ? rv : 0;
+
+ return fasync_helper(inode, file, on, &fasync[port]);
}
#endif
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 537959d0714..bc8996c849a 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1917,12 +1917,7 @@ static struct sonypi_compat_s sonypi_compat = {
static int sonypi_misc_fasync(int fd, struct file *filp, int on)
{
- int retval;
-
- retval = fasync_helper(fd, filp, on, &sonypi_compat.fifo_async);
- if (retval < 0)
- return retval;
- return 0;
+ return fasync_helper(fd, filp, on, &sonypi_compat.fifo_async);
}
static int sonypi_misc_release(struct inode *inode, struct file *file)
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 516925d8b57..b4ef2f84ea3 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1154,7 +1154,6 @@ sg_poll(struct file *filp, poll_table * wait)
static int
sg_fasync(int fd, struct file *filp, int mode)
{
- int retval;
Sg_device *sdp;
Sg_fd *sfp;
@@ -1163,8 +1162,7 @@ sg_fasync(int fd, struct file *filp, int mode)
SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
sdp->disk->disk_name, mode));
- retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
- return (retval < 0) ? retval : 0;
+ return fasync_helper(fd, filp, mode, &sfp->async_qp);
}
static int
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 431bb645927..d865ca66ccb 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -184,6 +184,8 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0);
if (error < 0)
goto out;
+ if (error > 0)
+ error = 0;
}
spin_lock(&filp->f_lock);
filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
diff --git a/fs/ioctl.c b/fs/ioctl.c
index e8e89edba57..ac2d47e4392 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -432,7 +432,7 @@ static int ioctl_fioasync(unsigned int fd, struct file *filp,
else
error = -ENOTTY;
}
- return error;
+ return error < 0 ? error : 0;
}
static int ioctl_fsfreeze(struct file *filp)
diff --git a/fs/pipe.c b/fs/pipe.c
index 14f502b89cf..94ad15967cf 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -667,10 +667,7 @@ pipe_read_fasync(int fd, struct file *filp, int on)
retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_readers);
mutex_unlock(&inode->i_mutex);
- if (retval < 0)
- return retval;
-
- return 0;
+ return retval;
}
@@ -684,10 +681,7 @@ pipe_write_fasync(int fd, struct file *filp, int on)
retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_writers);
mutex_unlock(&inode->i_mutex);
- if (retval < 0)
- return retval;
-
- return 0;
+ return retval;
}
@@ -706,11 +700,7 @@ pipe_rdwr_fasync(int fd, struct file *filp, int on)
fasync_helper(-1, filp, 0, &pipe->fasync_readers);
}
mutex_unlock(&inode->i_mutex);
-
- if (retval < 0)
- return retval;
-
- return 0;
+ return retval;
}
diff --git a/sound/core/control.c b/sound/core/control.c
index 636b3b52ef8..4b20fa2b7e6 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1373,12 +1373,9 @@ EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
static int snd_ctl_fasync(int fd, struct file * file, int on)
{
struct snd_ctl_file *ctl;
- int err;
+
ctl = file->private_data;
- err = fasync_helper(fd, file, on, &ctl->fasync);
- if (err < 0)
- return err;
- return 0;
+ return fasync_helper(fd, file, on, &ctl->fasync);
}
/*
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index a789efc9df3..a75c194e629 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3246,9 +3246,7 @@ static int snd_pcm_fasync(int fd, struct file * file, int on)
err = fasync_helper(fd, file, on, &runtime->fasync);
out:
unlock_kernel();
- if (err < 0)
- return err;
- return 0;
+ return err;
}
/*
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 796532081e8..3f0050d0b71 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1825,13 +1825,9 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
static int snd_timer_user_fasync(int fd, struct file * file, int on)
{
struct snd_timer_user *tu;
- int err;
tu = file->private_data;
- err = fasync_helper(fd, file, on, &tu->fasync);
- if (err < 0)
- return err;
- return 0;
+ return fasync_helper(fd, file, on, &tu->fasync);
}
static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,