Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h

From	Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h
Date	2016-09-04 22:20 +0200
Message-ID	<sdM3w-2ae-5@gated-at.bofh.it> (permalink)
References	(1 earlier) <sd4Yx-5fv-1@gated-at.bofh.it> <sd5hT-5pg-3@gated-at.bofh.it> <sd5rA-5sw-5@gated-at.bofh.it> <sdcCJ-1GY-1@gated-at.bofh.it> <sdcCK-1GY-5@gated-at.bofh.it>
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On Sat, Sep 03, 2016 at 09:26:05AM +0300, Jarkko Sakkinen wrote:
> > 
> > OK, how would one get the chip instance?

Most subsystems have a get function that returns a kref'd pointer. For
TPM all we really need today is a 'get_default_tpm_for_ns' kind of
function.

> This still doesn't explain why moving the structures inside the driver
> would be wrong. Even if outside callers would use a pointer the
> structure could be opaque.

For instance, if we did a get function then the 'put' function would
be an inline around dev_put and that needs to see inside the chip.

This is a well trodden pattern in the kernel, there is no reason to do
something different for tpm.

Jason

Thread

[PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-09-02 23:50 +0200
  Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-09-03 00:20 +0200
    Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-09-03 00:40 +0200
      Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-09-03 00:50 +0200
        Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-09-03 08:30 +0200
          Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-09-03 08:30 +0200
            Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-09-04 22:20 +0200
              Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-09-05 07:50 +0200
                Re: [PATCH] tpm: move struct tpm_class_ops to drivers/char/tpm/tpm.h Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-09-05 19:50 +0200

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