staging: comedi: use comedi_dev_from_minor()

Remove the need to export comedi_get_device_file_info() by using the
new helper comedi_dev_from_minor(). This will also allow us to make
the comedi_device_file_info struct private.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -1608,14 +1608,11 @@ static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
 				  unsigned long arg)
 {
 	const unsigned minor = iminor(file->f_dentry->d_inode);
-	struct comedi_device_file_info *dev_file_info =
-	    comedi_get_device_file_info(minor);
-	struct comedi_device *dev;
+	struct comedi_device *dev = comedi_dev_from_minor(minor);
 	int rc;
 
-	if (dev_file_info == NULL || dev_file_info->device == NULL)
+	if (!dev)
 		return -ENODEV;
-	dev = dev_file_info->device;
 
 	mutex_lock(&dev->mutex);
 
@@ -2088,12 +2085,9 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
 static int comedi_open(struct inode *inode, struct file *file)
 {
 	const unsigned minor = iminor(inode);
-	struct comedi_device_file_info *dev_file_info =
-	    comedi_get_device_file_info(minor);
-	struct comedi_device *dev =
-	    dev_file_info ? dev_file_info->device : NULL;
+	struct comedi_device *dev = comedi_dev_from_minor(minor);
 
-	if (dev == NULL) {
+	if (!dev) {
 		DPRINTK("invalid minor number\n");
 		return -ENODEV;
 	}
@@ -2168,14 +2162,9 @@ static int comedi_open(struct inode *inode, struct file *file)
 static int comedi_fasync(int fd, struct file *file, int on)
 {
 	const unsigned minor = iminor(file->f_dentry->d_inode);
-	struct comedi_device_file_info *dev_file_info;
-	struct comedi_device *dev;
-	dev_file_info = comedi_get_device_file_info(minor);
+	struct comedi_device *dev = comedi_dev_from_minor(minor);
 
-	if (dev_file_info == NULL)
-		return -ENODEV;
-	dev = dev_file_info->device;
-	if (dev == NULL)
+	if (!dev)
 		return -ENODEV;
 
 	return fasync_helper(fd, file, on, &dev->async_queue);
@@ -2184,16 +2173,11 @@ static int comedi_fasync(int fd, struct file *file, int on)
 static int comedi_close(struct inode *inode, struct file *file)
 {
 	const unsigned minor = iminor(inode);
+	struct comedi_device *dev = comedi_dev_from_minor(minor);
 	struct comedi_subdevice *s = NULL;
 	int i;
-	struct comedi_device_file_info *dev_file_info;
-	struct comedi_device *dev;
-	dev_file_info = comedi_get_device_file_info(minor);
 
-	if (dev_file_info == NULL)
-		return -ENODEV;
-	dev = dev_file_info->device;
-	if (dev == NULL)
+	if (!dev)
 		return -ENODEV;
 
 	mutex_lock(&dev->mutex);

drivers/staging/comedi/drivers.c

@@ -213,13 +213,10 @@ int comedi_driver_unregister(struct comedi_driver *driver)
 
 	/* check for devices using this driver */
 	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
-		struct comedi_device_file_info *dev_file_info =
-		    comedi_get_device_file_info(i);
-		struct comedi_device *dev;
+		struct comedi_device *dev = comedi_dev_from_minor(i);
 
-		if (dev_file_info == NULL)
+		if (!dev)
 			continue;
-		dev = dev_file_info->device;
 
 		mutex_lock(&dev->mutex);
 		if (dev->attached && dev->driver == driver) {
@@ -834,7 +831,6 @@ int comedi_auto_config(struct device *hardware_device,
 		       struct comedi_driver *driver, unsigned long context)
 {
 	int minor;
-	struct comedi_device_file_info *dev_file_info;
 	struct comedi_device *comedi_dev;
 	int ret;
 
@@ -852,8 +848,7 @@ int comedi_auto_config(struct device *hardware_device,
 	if (minor < 0)
 		return minor;
 
-	dev_file_info = comedi_get_device_file_info(minor);
-	comedi_dev = dev_file_info->device;
+	comedi_dev = comedi_dev_from_minor(minor);
 
 	mutex_lock(&comedi_dev->mutex);
 	if (comedi_dev->attached)

drivers/staging/comedi/kcomedilib/kcomedilib_main.c

@@ -42,7 +42,6 @@ MODULE_LICENSE("GPL");
 
 struct comedi_device *comedi_open(const char *filename)
 {
-	struct comedi_device_file_info *dev_file_info;
 	struct comedi_device *dev;
 	unsigned int minor;
 
@@ -54,12 +53,9 @@ struct comedi_device *comedi_open(const char *filename)
 	if (minor >= COMEDI_NUM_BOARD_MINORS)
 		return NULL;
 
-	dev_file_info = comedi_get_device_file_info(minor);
-	if (dev_file_info == NULL)
-		return NULL;
-	dev = dev_file_info->device;
+	dev = comedi_dev_from_minor(minor);
 
-	if (dev == NULL || !dev->attached)
+	if (!dev || !dev->attached)
 		return NULL;
 
 	if (!try_module_get(dev->driver->module))

drivers/staging/comedi/proc.c

@@ -49,13 +49,10 @@ static int comedi_read(char *buf, char **start, off_t offset, int len,
 		     "driver_name, board_name, n_subdevices");
 
 	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
-		struct comedi_device_file_info *dev_file_info =
-		    comedi_get_device_file_info(i);
-		struct comedi_device *dev;
+		struct comedi_device *dev = comedi_dev_from_minor(i);
 
-		if (dev_file_info == NULL)
+		if (!dev)
 			continue;
-		dev = dev_file_info->device;
 
 		if (dev->attached) {
 			devices_q = 1;