From: "BALBIR SINGH" <balbir.singh@wipro.com>
To: Alexander Viro <viro@math.psu.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC] register_blkdev and unregister_blkdev
Date: Wed, 10 Oct 2001 16:18:44 +0530 [thread overview]
Message-ID: <3BC4278C.6070907@wipro.com> (raw)
In-Reply-To: <Pine.GSO.4.21.0110100633300.17790-100000@weyl.math.psu.edu>
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Alexander Viro wrote:
>>I was looking at the code for register_blkdev and unregister_blkdev. I
>>found that no
>>locking (spinlocks) are used to protect the blkdevs struture in these
>>functions. I suspect
>>we have not seen a problem till now since
>>
>
>... they are only called under BKL; ditto for lookups in the tables they
>(de-)populate.
>
What I wanted to know was, who is calling/holding the BKL? Is it because
lock_kernel is called in sys_create_module() and sys_init_module().
I also looked at sd.c, it does not hold the BKL before calling register_blkdev()
it calls devfs_register_blkdev() from sd_init().
Maybe I am still missing something.
Balbir
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next prev parent reply other threads:[~2001-10-10 10:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-10 10:23 [RFC] register_blkdev and unregister_blkdev BALBIR SINGH
2001-10-10 10:34 ` Alexander Viro
2001-10-10 10:48 ` BALBIR SINGH [this message]
2001-10-10 10:53 ` Alexander Viro
2001-10-10 11:08 ` BALBIR SINGH
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