i2c-dev: Use a list for data storage

i2c-dev: Use a list for data storage

Use a list instead of a static array for storing the i2c-dev data.
Given that most systems have less than 10 i2c busses, most of the
space was wasted, so this saves around 1 kB of memory (2 kB on 64-bit
archs.)

The drawback is that lookup was in O(1) and is now in O(N), but given
that the values of N are always small, I don't think this is a problem.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 25 insertions, 20 deletions

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 6e90dec02567..206e8052f90f 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -32,6 +32,7 @@
 #include <linux/slab.h>
 #include <linux/smp_lock.h>
 #include <linux/init.h>
+#include <linux/list.h>
 #include <linux/i2c.h>
 #include <linux/i2c-dev.h>
 #include <asm/uaccess.h>
@@ -39,21 +40,27 @@
 static struct i2c_client i2cdev_client_template;
 
 struct i2c_dev {
+        struct list_head list;
         struct i2c_adapter *adap;
         struct class_device *class_dev;
 };
 
 #define I2C_MINORS      256
-static struct i2c_dev *i2c_dev_array[I2C_MINORS];
-static DEFINE_SPINLOCK(i2c_dev_array_lock);
+static LIST_HEAD(i2c_dev_list);
+static DEFINE_SPINLOCK(i2c_dev_list_lock);
 
 static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
 {
         struct i2c_dev *i2c_dev;
 
-        spin_lock(&i2c_dev_array_lock);
-        i2c_dev = i2c_dev_array[index];
-        spin_unlock(&i2c_dev_array_lock);
+        spin_lock(&i2c_dev_list_lock);
+        list_for_each_entry(i2c_dev, &i2c_dev_list, list) {
+                if (i2c_dev->adap->nr == index)
+                        goto found;
+        }
+        i2c_dev = NULL;
+found:
+        spin_unlock(&i2c_dev_list_lock);
         return i2c_dev;
 }
 
@@ -61,30 +68,28 @@ static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
 {
         struct i2c_dev *i2c_dev;
 
+        if (adap->nr >= I2C_MINORS) {
+                printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n",
+                       adap->nr);
+                return ERR_PTR(-ENODEV);
+        }
+
         i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
         if (!i2c_dev)
                 return ERR_PTR(-ENOMEM);
-
-        spin_lock(&i2c_dev_array_lock);
-        if (i2c_dev_array[adap->nr]) {
-                spin_unlock(&i2c_dev_array_lock);
-                dev_err(&adap->dev, "i2c-dev already has a device assigned to this adapter\n");
-                goto error;
-        }
         i2c_dev->adap = adap;
-        i2c_dev_array[adap->nr] = i2c_dev;
-        spin_unlock(&i2c_dev_array_lock);
+
+        spin_lock(&i2c_dev_list_lock);
+        list_add_tail(&i2c_dev->list, &i2c_dev_list);
+        spin_unlock(&i2c_dev_list_lock);
         return i2c_dev;
-error:
-        kfree(i2c_dev);
-        return ERR_PTR(-ENODEV);
 }
 
 static void return_i2c_dev(struct i2c_dev *i2c_dev)
 {
-        spin_lock(&i2c_dev_array_lock);
-        i2c_dev_array[i2c_dev->adap->nr] = NULL;
-        spin_unlock(&i2c_dev_array_lock);
+        spin_lock(&i2c_dev_list_lock);
+        list_del(&i2c_dev->list);
+        spin_unlock(&i2c_dev_list_lock);
 }
 
 static ssize_t show_adapter_name(struct class_device *class_dev, char *buf)