Allow setting of number of raw devices as a module parameter

Allow setting of maximal number of raw devices as a module parameter. This
requires changing of static array into a vmalloced one (the array is going to
be too large for kmalloc).

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index ad59b4e..49502bc 100644 (file)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -523,7 +523,7 @@ config RAW_DRIVER
           with the O_DIRECT flag.
 
 config MAX_RAW_DEVS
-       int "Maximum number of RAW devices to support (1-8192)"
+       int "Maximum number of RAW devices to support (1-65536)"
        depends on RAW_DRIVER
        default "256"
        help

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index b4b9d5a..6f9db62 100644 (file)
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -21,6 +21,7 @@
 #include <linux/mutex.h>
 #include <linux/gfp.h>
 #include <linux/compat.h>
+#include <linux/vmalloc.h>
 
 #include <asm/uaccess.h>
 
@@ -30,10 +31,15 @@ struct raw_device_data {
 };
 
 static struct class *raw_class;
-static struct raw_device_data raw_devices[MAX_RAW_MINORS];
+static struct raw_device_data *raw_devices;
 static DEFINE_MUTEX(raw_mutex);
 static const struct file_operations raw_ctl_fops; /* forward declaration */
 
+static int max_raw_minors = MAX_RAW_MINORS;
+
+module_param(max_raw_minors, int, 0);
+MODULE_PARM_DESC(max_raw_minors, "Maximum number of raw devices (1-65536)");
+
 /*
  * Open/close code for raw IO.
  *
@@ -125,7 +131,7 @@ static int bind_set(int number, u64 major, u64 minor)
        struct raw_device_data *rawdev;
        int err = 0;
 
-       if (number <= 0 || number >= MAX_RAW_MINORS)
+       if (number <= 0 || number >= max_raw_minors)
                return -EINVAL;
 
        if (MAJOR(dev) != major || MINOR(dev) != minor)
@@ -312,12 +318,26 @@ static int __init raw_init(void)
        dev_t dev = MKDEV(RAW_MAJOR, 0);
        int ret;
 
-       ret = register_chrdev_region(dev, MAX_RAW_MINORS, "raw");
+       if (max_raw_minors < 1 || max_raw_minors > 65536) {
+               printk(KERN_WARNING "raw: invalid max_raw_minors (must be"
+                       " between 1 and 65536), using %d\n", MAX_RAW_MINORS);
+               max_raw_minors = MAX_RAW_MINORS;
+       }
+
+       raw_devices = vmalloc(sizeof(struct raw_device_data) * max_raw_minors);
+       if (!raw_devices) {
+               printk(KERN_ERR "Not enough memory for raw device structures\n");
+               ret = -ENOMEM;
+               goto error;
+       }
+       memset(raw_devices, 0, sizeof(struct raw_device_data) * max_raw_minors);
+
+       ret = register_chrdev_region(dev, max_raw_minors, "raw");
        if (ret)
                goto error;
 
        cdev_init(&raw_cdev, &raw_fops);
-       ret = cdev_add(&raw_cdev, dev, MAX_RAW_MINORS);
+       ret = cdev_add(&raw_cdev, dev, max_raw_minors);
        if (ret) {
                kobject_put(&raw_cdev.kobj);
                goto error_region;
@@ -336,8 +356,9 @@ static int __init raw_init(void)
        return 0;
 
 error_region:
-       unregister_chrdev_region(dev, MAX_RAW_MINORS);
+       unregister_chrdev_region(dev, max_raw_minors);
 error:
+       vfree(raw_devices);
        return ret;
 }
 
@@ -346,7 +367,7 @@ static void __exit raw_exit(void)
        device_destroy(raw_class, MKDEV(RAW_MAJOR, 0));
        class_destroy(raw_class);
        cdev_del(&raw_cdev);
-       unregister_chrdev_region(MKDEV(RAW_MAJOR, 0), MAX_RAW_MINORS);
+       unregister_chrdev_region(MKDEV(RAW_MAJOR, 0), max_raw_minors);
 }
 
 module_init(raw_init);