linux-kernel - Re: [PATCH] s390/dasd: Use kzalloc instead of kmalloc/memset

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Date:   Tue, 19 Apr 2022 07:43:49 +0200
From:   Sven Schnelle <svens@...ux.ibm.com>
To:     Haowen Bai <baihaowen@...zu.com>
Cc:     Stefan Haberland <sth@...ux.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        "Christian Borntraeger" <borntraeger@...ux.ibm.com>,
        <linux-s390@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] s390/dasd: Use kzalloc instead of kmalloc/memset

Hi,

Haowen Bai <baihaowen@...zu.com> writes:

> Use kzalloc rather than duplicating its implementation, which
> makes code simple and easy to understand.
>
> Signed-off-by: Haowen Bai <baihaowen@...zu.com>
> ---
>  drivers/s390/block/dasd_eckd.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
> index 8410a25a65c1..74a035c56c3e 100644
> --- a/drivers/s390/block/dasd_eckd.c
> +++ b/drivers/s390/block/dasd_eckd.c
> @@ -1480,7 +1480,7 @@ static int dasd_eckd_pe_handler(struct dasd_device *device,
>  {
>  	struct pe_handler_work_data *data;
>  
> -	data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
> +	data = kzalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
>  	if (!data) {
>  		if (mutex_trylock(&dasd_pe_handler_mutex)) {
>  			data = pe_handler_worker;
> @@ -1489,7 +1489,6 @@ static int dasd_eckd_pe_handler(struct dasd_device *device,
>  			return -ENOMEM;
>  		}
>  	} else {
> -		memset(data, 0, sizeof(*data));
>  		data->isglobal = 0;

Maybe also remove the isglobal assigment above, so the whole else block
could go away?

>  	}
>  	INIT_WORK(&data->worker, do_pe_handler_work);

Thanks,
Sven