linux-kernel - Re: [PATCH] media: dvb-frontends: Use kmemdup instead of duplicating its function

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Message-ID: <CAOcJUbzfv8DLpRAbAiodqDDQ5wH1uyqjJ-sKN+qJGr=xagQBNg@mail.gmail.com>
Date:   Tue, 18 Sep 2018 15:58:33 -0400
From:   Michael Ira Krufky <mkrufky@...uxtv.org>
To:     zhongjiang@...wei.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Brad Love <brad@...tdimension.cc>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: dvb-frontends: Use kmemdup instead of duplicating
 its function

On Tue, Sep 18, 2018 at 11:42 AM zhong jiang <zhongjiang@...wei.com> wrote:
>
> kmemdup has implemented the function that kmalloc() + memcpy().
> We prefer to kmemdup rather than code opened implementation.
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/media/dvb-frontends/lgdt3306a.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c
> index 0e1f5da..abec2e5 100644
> --- a/drivers/media/dvb-frontends/lgdt3306a.c
> +++ b/drivers/media/dvb-frontends/lgdt3306a.c
> @@ -2205,15 +2205,13 @@ static int lgdt3306a_probe(struct i2c_client *client,
>         struct dvb_frontend *fe;
>         int ret;
>
> -       config = kzalloc(sizeof(struct lgdt3306a_config), GFP_KERNEL);
> +       onfig = kmemdup(client->dev.platform_data,
> +                       sizeof(struct lgdt3306a_config), GFP_KERNEL);
>         if (config == NULL) {
>                 ret = -ENOMEM;
>                 goto fail;
>         }
>
> -       memcpy(config, client->dev.platform_data,
> -                       sizeof(struct lgdt3306a_config));
> -
>         config->i2c_addr = client->addr;
>         fe = lgdt3306a_attach(config, client->adapter);
>         if (fe == NULL) {

Thank you for this patch, Zhong.  I suspect, however, that the patch
might contain a typo.  It looks like the `c` got dropped off of the
`config` variable.

Did you test this before sending it in?

Thanks again and best regards,

Michael Krufky