saner FASYNC handling on file close

As it is, all instances of ->release() for files that have ->fasync()
need to remember to evict file from fasync lists; forgetting that
creates a hole and we actually have a bunch that *does* forget.

So let's keep our lives simple - let __fput() check FASYNC in
file->f_flags and call ->fasync() there if it's been set.  And lose that
crap in ->release() instances - leaving it there is still valid, but we
don't have to bother anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/hpet.c

@@ -427,9 +427,6 @@ static int hpet_release(struct inode *inode, struct file *file)
 	if (irq)
 		free_irq(irq, devp);
 
-	if (file->f_flags & FASYNC)
-		hpet_fasync(-1, file, 0);
-
 	file->private_data = NULL;
 	return 0;
 }

drivers/char/ipmi/ipmi_devintf.c

@@ -162,8 +162,6 @@ static int ipmi_release(struct inode *inode, struct file *file)
 	if (rv)
 		return rv;
 
-	ipmi_fasync (-1, file, 0);
-
 	/* FIXME - free the messages in the list. */
 	kfree(priv);
 

drivers/char/ipmi/ipmi_watchdog.c

@@ -870,7 +870,6 @@ static int ipmi_close(struct inode *ino, struct file *filep)
 		clear_bit(0, &ipmi_wdog_open);
 	}
 
-	ipmi_fasync(-1, filep, 0);
 	expect_close = 0;
 
 	return 0;

drivers/char/random.c

@@ -1139,18 +1139,12 @@ static int random_fasync(int fd, struct file *filp, int on)
 	return fasync_helper(fd, filp, on, &fasync);
 }
 
-static int random_release(struct inode *inode, struct file *filp)
-{
-	return fasync_helper(-1, filp, 0, &fasync);
-}
-
 const struct file_operations random_fops = {
 	.read  = random_read,
 	.write = random_write,
 	.poll  = random_poll,
 	.unlocked_ioctl = random_ioctl,
 	.fasync = random_fasync,
-	.release = random_release,
 };
 
 const struct file_operations urandom_fops = {
@@ -1158,7 +1152,6 @@ const struct file_operations urandom_fops = {
 	.write = random_write,
 	.unlocked_ioctl = random_ioctl,
 	.fasync = random_fasync,
-	.release = random_release,
 };
 
 /***************************************************************

drivers/char/rtc.c

@@ -788,8 +788,6 @@ static int rtc_release(struct inode *inode, struct file *file)
 	}
 	spin_unlock_irq(&rtc_lock);
 
-	if (file->f_flags & FASYNC)
-		rtc_fasync(-1, file, 0);
 no_irq:
 #endif
 

drivers/char/sonypi.c

@@ -898,7 +898,6 @@ static int sonypi_misc_fasync(int fd, struct file *filp, int on)
 
 static int sonypi_misc_release(struct inode *inode, struct file *file)
 {
-	sonypi_misc_fasync(-1, file, 0);
 	mutex_lock(&sonypi_device.lock);
 	sonypi_device.open_count--;
 	mutex_unlock(&sonypi_device.lock);