linux-kernel - Re: [PATCH v2 20/35] platform/x86/asus: Use kmemdup rather than duplicating its implementation

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Date:   Thu, 25 Jul 2019 20:43:43 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     Corentin Chary <corentin.chary@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 20/35] platform/x86/asus: Use kmemdup rather than
 duplicating its implementation

On Wed, Jul 3, 2019 at 7:30 PM Fuqian Huang <huangfq.daxian@...il.com> wrote:
>
> kmemdup is introduced to duplicate a region of memory in a neat way.
> Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
> write the size twice (sometimes lead to mistakes), kmemdup improves
> readability, leads to smaller code and also reduce the chances of mistakes.
> Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.
>

Pushed to my review and testing queue, thanks!

> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
> ---
> Changes in v2:
>   - Fix a typo in commit message (memset -> memcpy)
>   - Split into two patches.
>
>  drivers/platform/x86/asus-wmi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 9b18a184e0aa..472b317ad814 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -260,12 +260,11 @@ static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
>          * Copy to dma capable address otherwise memory corruption occurs as
>          * bios has to be able to access it.
>          */
> -       input.pointer = kzalloc(args.length, GFP_DMA | GFP_KERNEL);
> +       input.pointer = kmemdup(args.pointer, args.length, GFP_DMA | GFP_KERNEL);
>         input.length = args.length;
>         if (!input.pointer)
>                 return -ENOMEM;
>         phys_addr = virt_to_phys(input.pointer);
> -       memcpy(input.pointer, args.pointer, args.length);
>
>         status = asus_wmi_evaluate_method(ASUS_WMI_METHODID_AGFN,
>                                         phys_addr, 0, &retval);
> --
> 2.11.0
>


-- 
With Best Regards,
Andy Shevchenko