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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/>
To: Arnd Bergmann <>
	Jarkko Sakkinen
	Colin Ian King
Subject: Re: [PATCH] tpm: constify transmit data pointers
Date: Thu, 7 Sep 2017 14:01:53 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Thu, Sep 07, 2017 at 03:30:45PM +0200, Arnd Bergmann wrote:
> Making cmd_getticks 'const' introduced a couple of harmless warnings:
> drivers/char/tpm/tpm_tis_core.c: In function 'probe_itpm':
> drivers/char/tpm/tpm_tis_core.c:469:31: error: passing argument 2 of 'tpm_tis_send_data' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
>   rc = tpm_tis_send_data(chip, cmd_getticks, len);
> drivers/char/tpm/tpm_tis_core.c:477:31: error: passing argument 2 of 'tpm_tis_send_data' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
>   rc = tpm_tis_send_data(chip, cmd_getticks, len);
> drivers/char/tpm/tpm_tis_core.c:255:12: note: expected 'u8 * {aka unsigned char *}' but argument is of type 'const u8 * {aka const unsigned char *}'
>  static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
> This changes the related functions to all take 'const' pointers
> so that gcc can see this as being correct. I had to slightly
> modify the logic around tpm_tis_spi_transfer() for this to work
> without introducing ugly casts.
> Fixes: 5e35bd8e06b9 ("tpm_tis: make array cmd_getticks static const to shink object code size")
> Signed-off-by: Arnd Bergmann <>

Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/>

Bit confused how the compile warnings introduced by the original patch
were missed?? Jarkko do you run compile tests and sparse before
sending pull requests?


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  parent reply	other threads:[~2017-09-07 20:01 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-07 13:30 Arnd Bergmann
2017-09-07 16:24 ` Jarkko Sakkinen
2017-09-08 20:58   ` Arnd Bergmann
2017-09-08 21:46     ` Jarkko Sakkinen
     [not found] ` <>
2017-09-07 20:01   ` Jason Gunthorpe [this message]
2017-09-08 21:28     ` Jarkko Sakkinen

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