linux-kernel - Re: [PATCH -next] firmware: google: fix a NULL vs IS_ERR() check in cbmem_entry

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Message-ID: <CABXOdTcDuugW7t=MV_1Cy2cbe6GC4dUn_=4VmrYHobLzx1uscA@mail.gmail.com>
Date:   Tue, 15 Nov 2022 05:52:15 -0800
From:   Guenter Roeck <groeck@...gle.com>
To:     Peng Wu <wupeng58@...wei.com>
Cc:     jwerner@...omium.org, jrosenth@...omium.org,
        gregkh@...uxfoundation.org, groeck@...omium.org,
        linux-kernel@...r.kernel.org, liwei391@...wei.com
Subject: Re: [PATCH -next] firmware: google: fix a NULL vs IS_ERR() check in cbmem_entry_probe()

On Tue, Nov 15, 2022 at 1:14 AM Peng Wu <wupeng58@...wei.com> wrote:
>
> The devm_memremap() function returns error pointers on error,
> it doesn't return NULL.
>
> Fixes: 19d54020883c ("firmware: google: Implement cbmem in sysfs driver")
> Signed-off-by: Peng Wu <wupeng58@...wei.com>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  drivers/firmware/google/cbmem.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/google/cbmem.c b/drivers/firmware/google/cbmem.c
> index 685f3070ce9d..88e587ba1e0d 100644
> --- a/drivers/firmware/google/cbmem.c
> +++ b/drivers/firmware/google/cbmem.c
> @@ -106,8 +106,8 @@ static int cbmem_entry_probe(struct coreboot_device *dev)
>         entry->mem_file_buf = devm_memremap(&dev->dev, dev->cbmem_entry.address,
>                                             dev->cbmem_entry.entry_size,
>                                             MEMREMAP_WB);
> -       if (!entry->mem_file_buf)
> -               return -ENOMEM;
> +       if (IS_ERR(entry->mem_file_buf))
> +               return PTR_ERR(entry->mem_file_buf);
>
>         entry->size = dev->cbmem_entry.entry_size;
>
> --
> 2.17.1
>