linux-kernel - Re: [PATCH] ath6kl: Use vmalloc to allocate ar->fw for api1 method

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Message-ID: <CAFqt6zaALx895c0BVrMpLdtfgYLz=-mmqaurtD28Nm1Ut2g1Dw@mail.gmail.com>
Date:	Tue, 22 Dec 2015 00:53:12 +0530
From:	Souptick Joarder <jrdr.linux@...il.com>
To:	Brent Taylor <motobud@...il.com>
Cc:	Kalle Valo <kvalo@....qualcomm.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ath6kl@...ts.infradead.org
Subject: Re: [PATCH] ath6kl: Use vmalloc to allocate ar->fw for api1 method

Hi Brent,

On Tue, Dec 1, 2015 at 11:11 AM, Brent Taylor <motobud@...il.com> wrote:
> Since commit 8437754c83351d6213c1a47ff029c1126d6042a7, ar->fw is expected to be pointing to memory allocated by vmalloc.  If the api1 method (via ath6kl_fetch_fw_api1) is used to allocate memory for ar->fw, then kmemdup is used.  This patch checks if the firmware being loaded is the 'fw' image, then use vmalloc, otherwise use kmalloc.
>
> Signed-off-by: Brent Taylor <motobud@...il.com>
> ---
>  drivers/net/wireless/ath/ath6kl/init.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/ath6kl/init.c b/drivers/net/wireless/ath/ath6kl/init.c
> index 6ae0734..4f2b124d 100644
> --- a/drivers/net/wireless/ath/ath6kl/init.c
> +++ b/drivers/net/wireless/ath/ath6kl/init.c
> @@ -673,10 +673,15 @@ static int ath6kl_get_fw(struct ath6kl *ar, const char *filename,
>                 return ret;
>
>         *fw_len = fw_entry->size;
> -       *fw = kmemdup(fw_entry->data, fw_entry->size, GFP_KERNEL);
> +   if (&ar->fw == fw)
> +               *fw = vmalloc(fw_entry->size);
> +   else
> +               *fw = kmalloc(fw_entry->size, GFP_KERNEL);

          Why vmalloc and kmalloc both are required? can't use either
vmalloc or kmalloc?
>
>         if (*fw == NULL)
>                 ret = -ENOMEM;
> +       else
> +               memcpy(*fw, fw_entry->data, fw_entry->size);
>
>         release_firmware(fw_entry);
>
> --
> 2.6.3
>
> --
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-Souptick
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