linux-kernel - First kernel patch (optimization)

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Date:	Tue, 15 Sep 2015 20:53:28 +0100
From:	Eric Curtin <ericcurtin17@...il.com>
To:	valentina.manea.m@...il.com, shuah.kh@...sung.com
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: First kernel patch (optimization)

My first kernel patch, hope I did everything correctly! Instead of calling strlen on every iteration of the for loop, just call it once instead and store in a variable.

Signed-off-by: Eric Curtin <ericcurtin17@...il.com>

diff --git a/tools/usb/usbip/src/usbip_detach.c b/tools/usb/usbip/src/usbip_detach.c
index 05c6d15..9db9d21 100644
--- a/tools/usb/usbip/src/usbip_detach.c
+++ b/tools/usb/usbip/src/usbip_detach.c
@@ -47,7 +47,9 @@ static int detach_port(char *port)
 	uint8_t portnum;
 	char path[PATH_MAX+1];
 
-	for (unsigned int i = 0; i < strlen(port); i++)
+	unsigned int port_len = strlen(port);
+
+	for (unsigned int i = 0; i < port_len; i++)
 		if (!isdigit(port[i])) {
 			err("invalid port %s", port);
 			return -1;

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