linux-kernel - Re: [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable

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Date:   Thu, 18 Feb 2021 10:40:32 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Muhammad Usama Anjum <musamaanjum@...il.com>
Cc:     lee.jones@...aro.org, johannes@...solutions.net, arnd@...db.de,
        kuba@...nel.org, gustavoars@...nel.org, wanghai38@...wei.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wimax/i2400m: don't change the endianness of
 one byte variable

On Thu, Feb 18, 2021 at 02:21:54PM +0500, Muhammad Usama Anjum wrote:
> It is wrong to change the endianness of a variable which has just one
> byte size.
> 
> Sparse warnings fixed:
> drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> drivers/staging//wimax/i2400m/op-rfkill.c:159:14: warning: cast to restricted __le32
> drivers/staging//wimax/i2400m/op-rfkill.c:160:14: warning: cast to restricted __le32
> 
> Signed-off-by: Muhammad Usama Anjum <musamaanjum@...il.com>
> ---
>  drivers/staging/wimax/i2400m/control.c   | 4 ++--
>  drivers/staging/wimax/i2400m/op-rfkill.c | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/wimax/i2400m/control.c b/drivers/staging/wimax/i2400m/control.c
> index 1e270b2101e8..b6b2788af162 100644
> --- a/drivers/staging/wimax/i2400m/control.c
> +++ b/drivers/staging/wimax/i2400m/control.c
> @@ -452,8 +452,8 @@ void i2400m_report_state_parse_tlv(struct i2400m *i2400m,
>  		d_printf(2, dev, "%s: RF status TLV "
>  			 "found (0x%04x), sw 0x%02x hw 0x%02x\n",
>  			 tag, I2400M_TLV_RF_STATUS,
> -			 le32_to_cpu(rfss->sw_rf_switch),
> -			 le32_to_cpu(rfss->hw_rf_switch));
> +			 rfss->sw_rf_switch,
> +			 rfss->hw_rf_switch);

What do you mean by "one byte"?  This is a le32 sized variable, right?
If not, why isn't the le32_to_cpu() call complaining?

>  		i2400m_report_tlv_rf_switches_status(i2400m, rfss);
>  	}
>  	if (0 == i2400m_tlv_match(tlv, I2400M_TLV_MEDIA_STATUS, sizeof(*ms))) {
> diff --git a/drivers/staging/wimax/i2400m/op-rfkill.c b/drivers/staging/wimax/i2400m/op-rfkill.c
> index fbddf2e18c14..a159808f0ec2 100644
> --- a/drivers/staging/wimax/i2400m/op-rfkill.c
> +++ b/drivers/staging/wimax/i2400m/op-rfkill.c
> @@ -156,8 +156,8 @@ void i2400m_report_tlv_rf_switches_status(
>  	enum i2400m_rf_switch_status hw, sw;
>  	enum wimax_st wimax_state;
>  
> -	sw = le32_to_cpu(rfss->sw_rf_switch);
> -	hw = le32_to_cpu(rfss->hw_rf_switch);
> +	sw = rfss->sw_rf_switch;
> +	hw = rfss->hw_rf_switch;

Same here.

thanks,

greg k-h