linux-kernel - Re: [PATCH 4/5] TPM: addition of pnp

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Message-ID: <20081003200509.GA7577@us.ibm.com>
Date:	Fri, 3 Oct 2008 15:05:09 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, zohar@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, jmorris@...ei.org
Subject: Re: [PATCH 4/5] TPM: addition of pnp_remove()

Quoting Rajiv Andrade (srajiv@...ux.vnet.ibm.com):
> The tpm_dev_release function is only called for platform devices, not pnp devices, so we
> implemented the .remove function for pnp ones.
> Since it's code is very similar to the one inside tpm_dev_release, we've created a helper
> function tpm_dev_vendor_release, which is called by both.

Should tpm_infineon also be switched over to this?

> Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
> Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
> ---
>  drivers/char/tpm/tpm.c     |   22 ++++++++++++++++------
>  drivers/char/tpm/tpm.h     |    1 +
>  drivers/char/tpm/tpm_tis.c |   14 +++++++++++++-
>  3 files changed, 30 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
> index 24fb7ab..ab03b4d 100644
> --- a/drivers/char/tpm/tpm.c
> +++ b/drivers/char/tpm/tpm.c
> @@ -1133,23 +1133,33 @@ int tpm_pm_resume(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(tpm_pm_resume);
> 
> +/* In case vendor provided release function, call it too.*/
> +
> +void tpm_dev_vendor_release(struct tpm_chip *chip)
> +{
> +	if (chip->vendor.release)
> +	 	chip->vendor.release(chip->dev);
> +	
> +	clear_bit(chip->dev_num, dev_mask);
> +	kfree(chip->vendor.miscdev.name);
> +}
> +EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
> +
> +
>  /*
>   * Once all references to platform device are down to 0,
>   * release all allocated structures.
> - * In case vendor provided release function, call it too.
>   */
>  static void tpm_dev_release(struct device *dev)
>  {
>  	struct tpm_chip *chip = dev_get_drvdata(dev);
> 
> -	if (chip->vendor.release)
> -		chip->vendor.release(dev);
> -	chip->release(dev);
> +	tpm_dev_vendor_release(chip);
> 
> -	clear_bit(chip->dev_num, dev_mask);
> -	kfree(chip->vendor.miscdev.name);
> +	chip->release(dev);
>  	kfree(chip);
>  }
> +EXPORT_SYMBOL_GPL(tpm_dev_release);
> 
>  /*
>   * Called from tpm_<specific>.c probe function only for devices 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 2756cab..8e30df4 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -132,6 +132,7 @@ extern struct tpm_chip* tpm_register_hardware(struct device *,
>  				 const struct tpm_vendor_specific *);
>  extern int tpm_open(struct inode *, struct file *);
>  extern int tpm_release(struct inode *, struct file *);
> +extern void tpm_dev_vendor_release(struct tpm_chip *);
>  extern ssize_t tpm_write(struct file *, const char __user *, size_t,
>  			 loff_t *);
>  extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index ed1879c..3491d70 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -630,12 +630,23 @@ static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
>  	{"", 0}			/* Terminator */
>  };
> 
> +static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev)
> +{
> +	struct tpm_chip *chip = pnp_get_drvdata(dev);
> +	
> +	tpm_dev_vendor_release(chip);
> +
> +	kfree(chip);
> +}
> +
> +
>  static struct pnp_driver tis_pnp_driver = {
>  	.name = "tpm_tis",
>  	.id_table = tpm_pnp_tbl,
>  	.probe = tpm_tis_pnp_init,
>  	.suspend = tpm_tis_pnp_suspend,
>  	.resume = tpm_tis_pnp_resume,
> +	.remove = tpm_tis_pnp_remove,
>  };
> 
>  #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
> @@ -683,6 +694,7 @@ static void __exit cleanup_tis(void)
>  	spin_lock(&tis_lock);
>  	list_for_each_entry_safe(i, j, &tis_chips, list) {
>  		chip = to_tpm_chip(i);
> +		tpm_remove_hardware(chip->dev);
>  		iowrite32(~TPM_GLOBAL_INT_ENABLE &
>  			  ioread32(chip->vendor.iobase +
>  				   TPM_INT_ENABLE(chip->vendor.
> @@ -694,9 +706,9 @@ static void __exit cleanup_tis(void)
>  			free_irq(chip->vendor.irq, chip);
>  		iounmap(i->iobase);
>  		list_del(&i->list);
> -		tpm_remove_hardware(chip->dev);
>  	}
>  	spin_unlock(&tis_lock);
> +	
>  	if (force) {
>  		platform_device_unregister(pdev);
>  		driver_unregister(&tis_drv);
> -- 
> 1.5.6.3
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