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Message-ID: <64c763540512150553y65c62280uf83ce805399ea906@mail.gmail.com>
Date: Thu, 15 Dec 2005 19:23:42 +0530
From: Block Device <blockdevice@gmail.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Bdev->bd_disk is NULL @ initrd time
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Hi,

  I have a problem running the following code snippet from a kernel module.

  struct block_device *bdev=bdget(MKDEV(3,10));

  if(!bdev){
	printk(KERN_ALERT "NULL bdev.!!!\n");
	return -1;
    }

    if(!bdev->bd_disk){
	printk(KERN_ALERT "NULL bdev bd_disk.!!!\n");
	return -1;
    }
    printk(KERN_ALERT "Diskname is %s.\n",bdev->bd_disk->disk_name);

When this module is inserted from initrd's init script ( after block
drivers are loaded ) bdev->bd_disk is always NULL. But when its
inserted after the system has booted it
works fine. Can someone please explain this behaviour ?.

I checked that the block devices are up by spawning a shell just after
this module is inserted from the init script. When I cat /proc/devices
the ide device shows up.

Thanks
-BD
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