linux-kernel - pair of alloc

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Date:	Wed, 07 Jan 2009 07:00:25 +0100
From:	Németh Márton <nm127@...email.hu>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: pair of alloc_disk()?

Hi,

I cannot find free_disk() or similar function which takes "struct gendisk"
as a parameter and can do the reverse thing what alloc_disk() do.

Could you please give me a hint what would be the correct function call
in the following example in test_exit_module() so the module do not leak?

#include <linux/module.h>
#include <linux/genhd.h>

MODULE_AUTHOR("Márton Németh <nm127@...email.hu>");
MODULE_DESCRIPTION("Test alloc_disk");
MODULE_LICENSE("GPL");

static struct gendisk *gd_ptr;

static int test_init_module(void)
{
        printk(KERN_DEBUG "starting module\n");

        gd_ptr = alloc_disk(1);
        if (!gd_ptr) {
                return -ENOMEM;
        }

        printk(KERN_DEBUG "gd_ptr after alloc=%p\n", gd_ptr);

        return 0;
}

static void test_exit_module(void)
{
        printk(KERN_DEBUG "unloading module\n");

        /* FIXME: no free_disk(gd_ptr) is available */
}

module_init(test_init_module);
module_exit(test_exit_module);

Regards,

	Márton Németh
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