From:   Thomas Zimmermann <tzimmermann@suse.de>
To:     deller@gmx.de, paulus@samba.org, benh@kernel.crashing.org,
        linux@armlinux.org.uk, pjones@redhat.com, timur@kernel.org,
        adaplas@gmail.com, s.hauer@pengutronix.de, shawnguo@kernel.org,
        mbroemme@libmpq.org, thomas@winischhofer.net,
        James.Bottomley@HansenPartnership.com, spock@gentoo.org,
        sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com,
        geert+renesas@glider.be, corbet@lwn.net
Cc:     linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org,
        Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH 38/99] fbdev/intelfb: Parse option string with struct option_iter
Date:   Mon,  6 Mar 2023 16:59:15 +0100
Message-Id: <20230306160016.4459-39-tzimmermann@suse.de>
In-Reply-To: <20230306160016.4459-1-tzimmermann@suse.de>
References: <20230306160016.4459-1-tzimmermann@suse.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Use struct option_iter to walk over the individual options in the
driver's option string. Replaces the hand-written strsep() loop with
a clean interface. The helpers for struct option_iter handle empty
option strings and empty options transparently. The struct's _init
and _release functions duplicate and release the option string's
memory buffer as needed.

Done in preparation of constifying the option string.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/video/fbdev/intelfb/intelfbdrv.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/intelfb/intelfbdrv.c b/drivers/video/fbdev/intelfb/intelfbdrv.c
index 896c2646e2ae..2d4e03b9e7fd 100644
--- a/drivers/video/fbdev/intelfb/intelfbdrv.c
+++ b/drivers/video/fbdev/intelfb/intelfbdrv.c
@@ -108,6 +108,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -323,9 +324,10 @@ static __inline__ int get_opt_bool(const char *this_opt, const char *name,
 	return 1;
 }
 
-static int __init intelfb_setup(char *options)
+static int __init intelfb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
 	DBG_MSG("intelfb_setup\n");
 
@@ -348,9 +350,9 @@ static int __init intelfb_setup(char *options)
 	 *    video=intelfb:1024x768-16@75,accel=0
 	 */
 
-	while ((this_opt = strsep(&options, ","))) {
-		if (!*this_opt)
-			continue;
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, this_opt)) {
 		if (get_opt_bool(this_opt, "accel", &accel))
 			;
 		else if (get_opt_int(this_opt, "vram", &vram))
@@ -378,6 +380,8 @@ static int __init intelfb_setup(char *options)
 		}
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2