linux-kernel - Re: [PATCH 1/3] TPM: new stm i2c device driver

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Date:	Fri, 1 Oct 2010 12:25:51 -0300
From:	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
To:	Christophe Henri RICARD <christophe-h.ricard@...com>
Cc:	James Morris <jmorris@...ei.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"joe@...ches.com" <joe@...ches.com>
Subject: Re: [PATCH 1/3] TPM: new stm i2c device driver

Hi Christophe,

The code must be applied and compiled against the security-next tree, that currently doesn't provide the locked ioctl anymore. Can you implement the locking inside tpm_st19_i2c_ioctl() and set it at the unlocked_ioctl field? Shouldn't be too hard, you can get tpm_write() as an example.

By the way, I may be missing something, but why the tpm command transmission (TPMIOC_TRANSMIT) should be handled through ioctl instead of a modified tpm_write() that can send the commands through i2c?

Thanks,
Rajiv

On 01/10/2010, at 11:27, Christophe Henri RICARD wrote:

> Hi James,
> 
> Which kernel are you using ?
> I have made my testing with a 2.6.35.4 kernel.
> As far as I know kernel 2.6.36 will not provide any ioctl field any more.
> May be this is the reason ?
> 
> Please let me know.
> Thanks
> Christophe
> 
> -----Original Message-----
> From: James Morris [mailto:jmorris@...ei.org] 
> Sent: Thursday, September 30, 2010 7:51 PM
> To: Rajiv Andrade
> Cc: linux-kernel@...r.kernel.org; joe@...ches.com; Christophe Henri RICARD
> Subject: Re: [PATCH 1/3] TPM: new stm i2c device driver
> 
> On Thu, 30 Sep 2010, Rajiv Andrade wrote:
> 
>> From: Christophe Henri RICARD <christophe-h.ricard@...com>
>> 
>> This driver uses the Linux I2C, TPM and generic gpio interfaces.
>> 
>> Signed-off-by: Christophe Henri RICARD <christophe-h.ricard@...com>
>> Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
> 
> This does not look to have been compile tested against my tree:
> 
> CC [M]  drivers/char/tpm/tpm_stm_st19_i2c.o
> drivers/char/tpm/tpm_stm_st19_i2c.c:574: error: unknown field ioctl specified in initializer
> drivers/char/tpm/tpm_stm_st19_i2c.c:574: warning: initialization from incompatible pointer type
> make[1]: *** [drivers/char/tpm/tpm_stm_st19_i2c.o] Error 1
> 
> The locked ioctl was removed in commit
> b19dd42faf413b4705d4adb38521e82d73fa4249
> 
> 
> 
> - James
> -- 
> James Morris
> <jmorris@...ei.org>
> --
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