netdev - RE: [PATCH v2] ice: use min_t() to make code cleaner in ice

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Date:   Mon, 21 Mar 2022 16:02:20 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Wan Jiabing' <wanjiabing@...o.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "alexandr.lobakin@...el.com" <alexandr.lobakin@...el.com>
Subject: RE: [PATCH v2] ice: use min_t() to make code cleaner in ice_gnss

From: Wan Jiabing
> Sent: 21 March 2022 14:00
> 
> Fix the following coccicheck warning:
> ./drivers/net/ethernet/intel/ice/ice_gnss.c:79:26-27: WARNING opportunity for min()
> 
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
> ---
> Changelog:
> v2:
> - Use typeof(bytes_left) instead of u8.
> ---
>  drivers/net/ethernet/intel/ice/ice_gnss.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
> index 35579cf4283f..57586a2e6dec 100644
> --- a/drivers/net/ethernet/intel/ice/ice_gnss.c
> +++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
> @@ -76,8 +76,7 @@ static void ice_gnss_read(struct kthread_work *work)
>  	for (i = 0; i < data_len; i += bytes_read) {
>  		u16 bytes_left = data_len - i;

Oh FFS why is that u16?
Don't do arithmetic on anything smaller than 'int'

	David

> 
> -		bytes_read = bytes_left < ICE_MAX_I2C_DATA_SIZE ? bytes_left :
> -					  ICE_MAX_I2C_DATA_SIZE;
> +		bytes_read = min_t(typeof(bytes_left), bytes_left, ICE_MAX_I2C_DATA_SIZE);
> 
>  		err = ice_aq_read_i2c(hw, link_topo, ICE_GNSS_UBX_I2C_BUS_ADDR,
>  				      cpu_to_le16(ICE_GNSS_UBX_EMPTY_DATA),
> --
> 2.35.1

-
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