linux-kernel - Re: [RFC PATCH 37/57] drivers: s390: zcrypt: Use class_find_device_by

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Date:   Tue, 4 Jun 2019 08:47:15 +0200
From:   Harald Freudenberger <freude@...ux.ibm.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, rafael@...nel.org,
        Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [RFC PATCH 37/57] drivers: s390: zcrypt: Use
 class_find_device_by_devt helper

On 03.06.19 17:50, Suzuki K Poulose wrote:
> Use the generic helper to find a device matching the devt.
>
> Cc: Harald Freudenberger <freude@...ux.ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/s390/crypto/zcrypt_api.c | 11 +----------
>  1 file changed, 1 insertion(+), 10 deletions(-)
>
> diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
> index 16cad8e..99c9b77 100644
> --- a/drivers/s390/crypto/zcrypt_api.c
> +++ b/drivers/s390/crypto/zcrypt_api.c
> @@ -133,12 +133,6 @@ struct zcdn_device {
>  static int zcdn_create(const char *name);
>  static int zcdn_destroy(const char *name);
>  
> -/* helper function, matches the devt value for find_zcdndev_by_devt() */
> -static int __match_zcdn_devt(struct device *dev, const void *data)
> -{
> -	return dev->devt == *((dev_t *) data);
> -}
> -
>  /*
>   * Find zcdn device by name.
>   * Returns reference to the zcdn device which needs to be released
> @@ -159,10 +153,7 @@ static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
>   */
>  static inline struct zcdn_device *find_zcdndev_by_devt(dev_t devt)
>  {
> -	struct device *dev =
> -		class_find_device(zcrypt_class, NULL,
> -				  (void *) &devt,
> -				  __match_zcdn_devt);
> +	struct device *dev = class_find_device_by_devt(zcrypt_class, NULL, devt);
>  
>  	return dev ? to_zcdn_dev(dev) : NULL;
>  }
fine with me, thanks
acked-by: Harald Freudenberger <freude@...ux.ibm.com>