linux-kernel - Re: [PATCH] staging: mt7621-mmc: Remove do {} while (0) loop for single statement macro

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Date:   Mon, 17 Sep 2018 09:20:39 -0700
From:   Joe Perches <joe@...ches.com>
To:     Nishad Kamdar <nishadkamdar@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     NeilBrown <neil@...wn.name>, devel@...verdev.osuosl.org,
        Christian Lütke-Stetzkamp <christian@...mp.de>,
        linux-kernel@...r.kernel.org, John Crispin <blogic@...nwrt.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] staging: mt7621-mmc: Remove do {} while (0) loop for
 single statement macro

On Sat, 2018-09-15 at 18:47 +0530, Nishad Kamdar wrote:
> This patch removes do {} while (0) loop for single statement macros.
> Issue found by checkpatch.

Some or all of this code is not used and should be deleted instead.

> Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> ---
>  drivers/staging/mt7621-mmc/sd.c | 28 +++++++---------------------
>  1 file changed, 7 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c
> index 7474f9ed7b5b..ec12a3a5a926 100644
> --- a/drivers/staging/mt7621-mmc/sd.c
> +++ b/drivers/staging/mt7621-mmc/sd.c
> @@ -104,14 +104,10 @@ static int cd_active_low = 1;
>  /* gate means clock power down */
>  static int g_clk_gate = 0;
>  #define msdc_gate_clock(id) \
> -	do {					       \
> -		g_clk_gate &= ~(1 << ((id) + PERI_MSDC0_PDN));	\
> -	} while (0)
> +	(g_clk_gate &= ~(1 << ((id) + PERI_MSDC0_PDN)))
>  /* not like power down register. 1 means clock on. */
>  #define msdc_ungate_clock(id) \
> -	do {					    \
> -		g_clk_gate |= 1 << ((id) + PERI_MSDC0_PDN);	\
> -	} while (0)
> +	(g_clk_gate |= 1 << ((id) + PERI_MSDC0_PDN))
>  
>  // do we need sync object or not
>  void msdc_clk_status(int *status)
> @@ -170,9 +166,7 @@ static void msdc_clr_fifo(struct msdc_host *host)
>  	} while (0)
>  
>  #define msdc_irq_restore(val) \
> -	do {					\
> -		sdr_set_bits(host->base + MSDC_INTEN, val);	\
> -	} while (0)
> +	(sdr_set_bits(host->base + MSDC_INTEN, val))
>  
>  /* clock source for host: global */
>  #if defined(CONFIG_SOC_MT7620)
> @@ -186,26 +180,18 @@ static u32 hclks[] = {50000000}; /* +/- by chhung */
>  //    always keep the VMC on.
>  //============================================
>  #define msdc_vcore_on(host) \
> -	do {								\
> -		(void)hwPowerOn(MT65XX_POWER_LDO_VMC, VOL_3300, "SD");	\
> -	} while (0)
> +	((void)hwPowerOn(MT65XX_POWER_LDO_VMC, VOL_3300, "SD"))
>  #define msdc_vcore_off(host) \
> -	do {								\
> -		(void)hwPowerDown(MT65XX_POWER_LDO_VMC, "SD");		\
> -	} while (0)
> +	((void)hwPowerDown(MT65XX_POWER_LDO_VMC, "SD"))
>  
>  //====================================
>  // the vdd output for card: global
>  //   always keep the VMCH on.
>  //====================================
>  #define msdc_vdd_on(host) \
> -	do {								\
> -		(void)hwPowerOn(MT65XX_POWER_LDO_VMCH, VOL_3300, "SD"); \
> -	} while (0)
> +	((void)hwPowerOn(MT65XX_POWER_LDO_VMCH, VOL_3300, "SD"))
>  #define msdc_vdd_off(host) \
> -	do {							\
> -		(void)hwPowerDown(MT65XX_POWER_LDO_VMCH, "SD"); \
> -	} while (0)
> +	((void)hwPowerDown(MT65XX_POWER_LDO_VMCH, "SD"))
>  
>  #define sdc_is_busy()          (readl(host->base + SDC_STS) & SDC_STS_SDCBUSY)
>  #define sdc_is_cmd_busy()      (readl(host->base + SDC_STS) & SDC_STS_CMDBUSY)