Re: [PATCH v4 06/10] tpm: Replace device number bitmap with IDR

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Mon, Feb 29, 2016 at 12:29:52PM -0500, Stefan Berger wrote:
> Replace the device number bitmap with IDR. Extend the number of devices we
> can create to 64k.
> Since an IDR allows us to associate a pointer with an ID, we use this now
> to rewrite tpm_chip_find_get() to simply look up the chip pointer by the
> given device ID.
> 
> Protect the IDR calls with a mutex.
> 
> Signed-off-by: Stefan Berger <stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>

 -	TPM_NUM_DEVICES = 256,
 +	TPM_NUM_DEVICES = 65536,
        rc = alloc_chrdev_region(&tpm_devt, 0, TPM_NUM_DEVICES, "tpm");

Although I do still wonder if passing such a large number to
alloc_chrdev_region is a good idea. Should it be MINORMASK instead or something?

Jason

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