[PATCH] remove unnecessary stubs from watchdog drivers

This removes some function stubs from 6 watchdog drivers.

The VFS already returns -EINVAL in cases where fop->read == NULL, so
there's no need to duplicate the code 6 times.  This patch removes the
stubs and is compile tested.

drivers/char/watchdog/acquirewdt.c

@@ -96,13 +96,6 @@ static ssize_t acq_write(struct file *file, const char *buf, size_t count, loff_
 	return 0;
 }
 
-static ssize_t acq_read(struct file *file, char *buf, size_t count, loff_t *ppos)
-{
-	return -EINVAL;
-}
-
-
-
 static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	unsigned long arg)
 {
@@ -193,7 +186,6 @@ static int acq_notify_sys(struct notifier_block *this, unsigned long code,
  
 static struct file_operations acq_fops = {
 	.owner		= THIS_MODULE,
-	.read		= acq_read,
 	.write		= acq_write,
 	.ioctl		= acq_ioctl,
 	.open		= acq_open,

drivers/char/watchdog/alim7101_wdt.c

@@ -183,12 +183,6 @@ static ssize_t fop_write(struct file * file, const char * buf, size_t count, lof
 	return 0;
 }
 
-static ssize_t fop_read(struct file * file, char * buf, size_t count, loff_t * ppos)
-{
-	/* No can do */
-	return -EINVAL;
-}
-
 static int fop_open(struct inode * inode, struct file * file)
 {
 	/* Just in case we're already talking to someone... */
@@ -234,7 +228,6 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
 static struct file_operations wdt_fops = {
 	.owner=		THIS_MODULE,
 	.llseek=	no_llseek,
-	.read=		fop_read,
 	.write=		fop_write,
 	.open=		fop_open,
 	.release=	fop_close,

drivers/char/watchdog/ib700wdt.c

@@ -166,12 +166,6 @@ ibwdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 	return 0;
 }
 
-static ssize_t
-ibwdt_read(struct file *file, char *buf, size_t count, loff_t *ppos)
-{
-	return -EINVAL;
-}
-
 static int
 ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	  unsigned long arg)
@@ -280,7 +274,6 @@ ibwdt_notify_sys(struct notifier_block *this, unsigned long code,
 
 static struct file_operations ibwdt_fops = {
 	.owner		= THIS_MODULE,
-	.read		= ibwdt_read,
 	.write		= ibwdt_write,
 	.ioctl		= ibwdt_ioctl,
 	.open		= ibwdt_open,

drivers/char/watchdog/machzwd.c

@@ -349,14 +349,6 @@ static ssize_t zf_write(struct file *file, const char *buf, size_t count,
 	return 0;
 }
 
-static ssize_t zf_read(struct file *file, char *buf, size_t count, 
-							loff_t *ppos)
-{
-	return -EINVAL;
-}
-
-
-
 static int zf_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	unsigned long arg)
 {
@@ -448,7 +440,6 @@ static int zf_notify_sys(struct notifier_block *this, unsigned long code,
 
 static struct file_operations zf_fops = {
 	.owner          = THIS_MODULE,
-	.read           = zf_read,
 	.write          = zf_write,
 	.ioctl          = zf_ioctl,
 	.open           = zf_open,

drivers/char/watchdog/sbc60xxwdt.c

@@ -194,12 +194,6 @@ static ssize_t fop_write(struct file * file, const char * buf, size_t count, lof
 	return 0;
 }
 
-static ssize_t fop_read(struct file * file, char * buf, size_t count, loff_t * ppos)
-{
-	/* No can do */
-	return -EINVAL;
-}
-
 static int fop_open(struct inode * inode, struct file * file)
 {
 	switch(minor(inode->i_rdev)) 
@@ -260,7 +254,6 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 static struct file_operations wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
-	.read		= fop_read,
 	.write		= fop_write,
 	.open		= fop_open,
 	.release	= fop_close,

drivers/char/watchdog/w83877f_wdt.c

@@ -202,12 +202,6 @@ static ssize_t fop_write(struct file * file, const char * buf, size_t count, lof
 	return 0;
 }
 
-static ssize_t fop_read(struct file * file, char * buf, size_t count, loff_t * ppos)
-{
-	/* No can do */
-	return -EINVAL;
-}
-
 static int fop_open(struct inode * inode, struct file * file)
 {
 	switch(minor(inode->i_rdev)) 
@@ -268,7 +262,6 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 static struct file_operations wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
-	.read		= fop_read,
 	.write		= fop_write,
 	.open		= fop_open,
 	.release	= fop_close,