[PATCH] usb: musb: remove redundant stack buffers

[PATCH] usb: musb: remove redundant stack buffers

[Rasmus Villemoes]

aDate is always the empty string, so entirely pointless. The aRevision
formatting might as well be done as part of the pr_debug() call - that
also avoids it altogether if pr_debug is compiled out.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
 drivers/usb/musb/musb_core.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 74fc3069cb42..1724f1889c99 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1448,7 +1448,7 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
 {
 	u8 reg;
 	char *type;
-	char aInfo[90], aRevision[32], aDate[12];
+	char aInfo[90];
 	void __iomem	*mbase = musb->mregs;
 	int		status = 0;
 	int		i;
@@ -1482,7 +1482,6 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
 
 	pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
 
-	aDate[0] = 0;
 	if (MUSB_CONTROLLER_MHDRC == musb_type) {
 		musb->is_multipoint = 1;
 		type = "M";
@@ -1497,11 +1496,10 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
 
 	/* log release info */
 	musb->hwvers = musb_read_hwvers(mbase);
-	snprintf(aRevision, 32, "%d.%d%s", MUSB_HWVERS_MAJOR(musb->hwvers),
-		MUSB_HWVERS_MINOR(musb->hwvers),
-		(musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
-	pr_debug("%s: %sHDRC RTL version %s %s\n",
-		 musb_driver_name, type, aRevision, aDate);
+	pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
+		 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
+		 MUSB_HWVERS_MINOR(musb->hwvers),
+		 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
 
 	/* configure ep0 */
 	musb_configure_ep0(musb);
-- 
2.1.4

Re: [PATCH] usb: musb: remove redundant stack buffers

[Bin Liu]

Hi,

On Thu, Aug 04, 2016 at 08:58:18PM +0200, Rasmus Villemoes wrote:
> aDate is always the empty string, so entirely pointless. The aRevision
> formatting might as well be done as part of the pr_debug() call - that
> also avoids it altogether if pr_debug is compiled out.
> 
> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>

Signed-off-by: Bin Liu <b-liu@ti.com>

Regards,
-Bin.

> ---
>  drivers/usb/musb/musb_core.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index 74fc3069cb42..1724f1889c99 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -1448,7 +1448,7 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
>  {
>  	u8 reg;
>  	char *type;
> -	char aInfo[90], aRevision[32], aDate[12];
> +	char aInfo[90];
>  	void __iomem	*mbase = musb->mregs;
>  	int		status = 0;
>  	int		i;
> @@ -1482,7 +1482,6 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
>  
>  	pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
>  
> -	aDate[0] = 0;
>  	if (MUSB_CONTROLLER_MHDRC == musb_type) {
>  		musb->is_multipoint = 1;
>  		type = "M";
> @@ -1497,11 +1496,10 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
>  
>  	/* log release info */
>  	musb->hwvers = musb_read_hwvers(mbase);
> -	snprintf(aRevision, 32, "%d.%d%s", MUSB_HWVERS_MAJOR(musb->hwvers),
> -		MUSB_HWVERS_MINOR(musb->hwvers),
> -		(musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
> -	pr_debug("%s: %sHDRC RTL version %s %s\n",
> -		 musb_driver_name, type, aRevision, aDate);
> +	pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
> +		 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
> +		 MUSB_HWVERS_MINOR(musb->hwvers),
> +		 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
>  
>  	/* configure ep0 */
>  	musb_configure_ep0(musb);
> -- 
> 2.1.4
>