staging: comedi: separate board and subdevice minor tables

The comedi core reserves minor device numbers from 0 to
`COMEDI_NUM_BOARD_MINORS - 1` (0 to 0x30 - 1) for the main comedi
"board" devices and reserves minor device numbers from
`COMEDI_NUM_BOARD_MINORS` to `COMEDI_NUM_MINORS - 1` (0x30 to 0x100 - 1)
for comedi subdevices (or at least those that claim to support
asynchronous comedi commands).  There is an array
`comedi_file_info_table[COMEDI_NUM_MINORS]` used to hold pointers to
information for each board minor device number and subdevice minor
device number that has been allocated (with NULL pointers for those not
allocated), along with a protective lock `comedi_file_info_table_lock`.

Since the ranges of board minor device numbers and subdevice minor
device numbers do not overlap, we can use separate tables and separate
locks for the different types of minor device numbers.  This will allow
us to use different pointer types for the elements of each table in the
future without just using a generic `void *`.  (At the moment, the table
elements point to a `struct comedi_file_info` allocated dynamically for
each allocated board minor device or subdevice minor device, but I plan
to get rid of that data structure.)

Replace `comedi_file_info_table[COMEDI_NUM_MINORS]` with two new arrays
of the same type, `comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]`
for board minors, and
`comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]` for
subdevice minors (where `COMEDI_NUM_SUBDEVICE_MINORS` is
`COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS`).
`comedi_subdevice_minor_table[]` is indexed by the subdevice minor
number minus `COMEDI_NUM_BOARD_MINORS` since `COMEDI_NUM_BOARD_MINORS`
is the first valid subdevice minor number.

Replace `comedi_file_info_table_lock` with
`comedi_board_minor_table_lock` for board minors and
`comedi_subdevice_minor_table_lock` for subdevice minors.

Refactor `comedi_clear_minor()` to call one of two new functions
`comedi_clear_board_minor()` and `comedi_clear_subdevice_minor()`
depending on the minor device number passed as a parameter.  Similarly,
refactor `comedi_file_info_from_minor()` to call one of two new
functions `comedi_file_info_from_board_minor()` and
`comedi_file_info_from_subdevice_minor()` depending on the minor device
number parameter.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -50,6 +50,8 @@
 #include "comedi_internal.h"
 
 #define COMEDI_NUM_MINORS 0x100
+#define COMEDI_NUM_SUBDEVICE_MINORS	\
+	(COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
 
 #ifdef CONFIG_COMEDI_DEBUG
 int comedi_debug;
@@ -86,8 +88,14 @@ struct comedi_file_info {
 	struct device *hardware_device;
 };
 
-static DEFINE_MUTEX(comedi_file_info_table_lock);
-static struct comedi_file_info *comedi_file_info_table[COMEDI_NUM_MINORS];
+static DEFINE_MUTEX(comedi_board_minor_table_lock);
+static struct comedi_file_info
+*comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS];
+
+static DEFINE_MUTEX(comedi_subdevice_minor_table_lock);
+/* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */
+static struct comedi_file_info
+*comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS];
 
 static struct class *comedi_class;
 static struct cdev comedi_cdev;
@@ -119,17 +127,37 @@ static void comedi_device_cleanup(struct comedi_device *dev)
 	mutex_destroy(&dev->mutex);
 }
 
-static struct comedi_file_info *comedi_clear_minor(unsigned minor)
+static struct comedi_file_info *comedi_clear_board_minor(unsigned minor)
 {
 	struct comedi_file_info *info;
 
-	mutex_lock(&comedi_file_info_table_lock);
-	info = comedi_file_info_table[minor];
-	comedi_file_info_table[minor] = NULL;
-	mutex_unlock(&comedi_file_info_table_lock);
+	mutex_lock(&comedi_board_minor_table_lock);
+	info = comedi_board_minor_table[minor];
+	comedi_board_minor_table[minor] = NULL;
+	mutex_unlock(&comedi_board_minor_table_lock);
 	return info;
 }
 
+static struct comedi_file_info *comedi_clear_subdevice_minor(unsigned minor)
+{
+	struct comedi_file_info *info;
+	unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
+
+	mutex_lock(&comedi_subdevice_minor_table_lock);
+	info = comedi_subdevice_minor_table[i];
+	comedi_subdevice_minor_table[i] = NULL;
+	mutex_unlock(&comedi_subdevice_minor_table_lock);
+	return info;
+}
+
+static struct comedi_file_info *comedi_clear_minor(unsigned minor)
+{
+	if (minor < COMEDI_NUM_BOARD_MINORS)
+		return comedi_clear_board_minor(minor);
+	else
+		return comedi_clear_subdevice_minor(minor);
+}
+
 static void comedi_free_board_file_info(struct comedi_file_info *info)
 {
 	if (info) {
@@ -146,17 +174,39 @@ static void comedi_free_board_file_info(struct comedi_file_info *info)
 	}
 }
 
-static struct comedi_file_info *comedi_file_info_from_minor(unsigned minor)
+static struct comedi_file_info
+*comedi_file_info_from_board_minor(unsigned minor)
 {
 	struct comedi_file_info *info;
 
-	BUG_ON(minor >= COMEDI_NUM_MINORS);
-	mutex_lock(&comedi_file_info_table_lock);
-	info = comedi_file_info_table[minor];
-	mutex_unlock(&comedi_file_info_table_lock);
+	BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
+	mutex_lock(&comedi_board_minor_table_lock);
+	info = comedi_board_minor_table[minor];
+	mutex_unlock(&comedi_board_minor_table_lock);
 	return info;
 }
 
+static struct comedi_file_info
+*comedi_file_info_from_subdevice_minor(unsigned minor)
+{
+	struct comedi_file_info *info;
+	unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
+
+	BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS);
+	mutex_lock(&comedi_subdevice_minor_table_lock);
+	info = comedi_subdevice_minor_table[i];
+	mutex_unlock(&comedi_subdevice_minor_table_lock);
+	return info;
+}
+
+static struct comedi_file_info *comedi_file_info_from_minor(unsigned minor)
+{
+	if (minor < COMEDI_NUM_BOARD_MINORS)
+		return comedi_file_info_from_board_minor(minor);
+	else
+		return comedi_file_info_from_subdevice_minor(minor);
+}
+
 static struct comedi_device *
 comedi_dev_from_file_info(struct comedi_file_info *info)
 {
@@ -2330,15 +2380,15 @@ struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device)
 	comedi_device_init(dev);
 	comedi_set_hw_dev(dev, hardware_device);
 	mutex_lock(&dev->mutex);
-	mutex_lock(&comedi_file_info_table_lock);
+	mutex_lock(&comedi_board_minor_table_lock);
 	for (i = hardware_device ? comedi_num_legacy_minors : 0;
 	     i < COMEDI_NUM_BOARD_MINORS; ++i) {
-		if (comedi_file_info_table[i] == NULL) {
-			comedi_file_info_table[i] = info;
+		if (comedi_board_minor_table[i] == NULL) {
+			comedi_board_minor_table[i] = info;
 			break;
 		}
 	}
-	mutex_unlock(&comedi_file_info_table_lock);
+	mutex_unlock(&comedi_board_minor_table_lock);
 	if (i == COMEDI_NUM_BOARD_MINORS) {
 		mutex_unlock(&dev->mutex);
 		comedi_device_cleanup(dev);
@@ -2371,15 +2421,15 @@ void comedi_release_hardware_device(struct device *hardware_device)
 
 	for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS;
 	     minor++) {
-		mutex_lock(&comedi_file_info_table_lock);
-		info = comedi_file_info_table[minor];
+		mutex_lock(&comedi_board_minor_table_lock);
+		info = comedi_board_minor_table[minor];
 		if (info && info->hardware_device == hardware_device) {
-			comedi_file_info_table[minor] = NULL;
-			mutex_unlock(&comedi_file_info_table_lock);
+			comedi_board_minor_table[minor] = NULL;
+			mutex_unlock(&comedi_board_minor_table_lock);
 			comedi_free_board_file_info(info);
 			break;
 		}
-		mutex_unlock(&comedi_file_info_table_lock);
+		mutex_unlock(&comedi_board_minor_table_lock);
 	}
 }
 
@@ -2398,19 +2448,20 @@ int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
 		info->read_subdevice = s;
 	if (s->subdev_flags & SDF_CMD_WRITE)
 		info->write_subdevice = s;
-	mutex_lock(&comedi_file_info_table_lock);
-	for (i = COMEDI_NUM_BOARD_MINORS; i < COMEDI_NUM_MINORS; ++i) {
-		if (comedi_file_info_table[i] == NULL) {
-			comedi_file_info_table[i] = info;
+	mutex_lock(&comedi_subdevice_minor_table_lock);
+	for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) {
+		if (comedi_subdevice_minor_table[i] == NULL) {
+			comedi_subdevice_minor_table[i] = info;
 			break;
 		}
 	}
-	mutex_unlock(&comedi_file_info_table_lock);
-	if (i == COMEDI_NUM_MINORS) {
+	mutex_unlock(&comedi_subdevice_minor_table_lock);
+	if (i == COMEDI_NUM_SUBDEVICE_MINORS) {
 		kfree(info);
 		pr_err("comedi: error: ran out of minor numbers for subdevice files.\n");
 		return -EBUSY;
 	}
+	i += COMEDI_NUM_BOARD_MINORS;
 	s->minor = i;
 	csdev = device_create(comedi_class, dev->class_dev,
 			      MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
@@ -2515,8 +2566,10 @@ static void __exit comedi_cleanup(void)
 	int i;
 
 	comedi_cleanup_board_minors();
-	for (i = 0; i < COMEDI_NUM_MINORS; ++i)
-		BUG_ON(comedi_file_info_table[i]);
+	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i)
+		BUG_ON(comedi_board_minor_table[i]);
+	for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i)
+		BUG_ON(comedi_subdevice_minor_table[i]);
 
 	class_destroy(comedi_class);
 	cdev_del(&comedi_cdev);