linux-kernel - Re: [PATCH] TPM: Let the tpm char device be openable multiple times

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Message-ID: <20091103104352.3a460ae9@lxorguk.ukuu.org.uk>
Date:	Tue, 3 Nov 2009 10:43:52 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	srajiv@...ux.vnet.ibm.com
Subject: Re: [PATCH] TPM: Let the tpm char device be openable multiple times

> - Move the user space data buffer and related goop into a
>   struct tpm_file, create one struct tpm_file per open file.

Is that really sufficient ?

You can open a file once, dup it (or inherit it and get multiple callers
from the same file handle. Ditto consider threated apps

Alan
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