linux-kernel - [PATCH 27/99] fbdev/geode: Parse option string with struct option

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Message-Id: <20230306160016.4459-28-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:59:04 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, timur@...nel.org,
        adaplas@...il.com, s.hauer@...gutronix.de, shawnguo@...nel.org,
        mbroemme@...mpq.org, thomas@...ischhofer.net,
        James.Bottomley@...senPartnership.com, spock@...too.org,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        geert+renesas@...der.be, corbet@....net
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH 27/99] fbdev/geode: Parse option string with struct option_iter

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@...e.de>
---
 drivers/video/fbdev/geode/gx1fb_core.c | 16 ++++++++--------
 drivers/video/fbdev/geode/gxfb_core.c  | 17 ++++++++---------
 drivers/video/fbdev/geode/lxfb_core.c  | 14 ++++++--------
 3 files changed, 22 insertions(+), 25 deletions(-)

diff --git a/drivers/video/fbdev/geode/gx1fb_core.c b/drivers/video/fbdev/geode/gx1fb_core.c
index 9c942001ac10..dd1dc7ee7f83 100644
--- a/drivers/video/fbdev/geode/gx1fb_core.c
+++ b/drivers/video/fbdev/geode/gx1fb_core.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -403,17 +404,14 @@ static void gx1fb_remove(struct pci_dev *pdev)
 }
 
 #ifndef MODULE
-static void __init gx1fb_setup(char *options)
+static void __init gx1fb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
-	if (!options || !*options)
-		return;
-
-	while ((this_opt = strsep(&options, ","))) {
-		if (!*this_opt)
-			continue;
+	option_iter_init(&iter, options);
 
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "mode:", 5))
 			strscpy(mode_option, this_opt + 5, sizeof(mode_option));
 		else if (!strncmp(this_opt, "crt:", 4))
@@ -423,6 +421,8 @@ static void __init gx1fb_setup(char *options)
 		else
 			strscpy(mode_option, this_opt, sizeof(mode_option));
 	}
+
+	option_iter_release(&iter);
 }
 #endif
 
diff --git a/drivers/video/fbdev/geode/gxfb_core.c b/drivers/video/fbdev/geode/gxfb_core.c
index 3ed85d2d53e9..f5e88e92ba16 100644
--- a/drivers/video/fbdev/geode/gxfb_core.c
+++ b/drivers/video/fbdev/geode/gxfb_core.c
@@ -16,6 +16,7 @@
  * 16 MiB of framebuffer memory is assumed to be available.
  */
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -488,21 +489,17 @@ static struct pci_driver gxfb_driver = {
 };
 
 #ifndef MODULE
-static int __init gxfb_setup(char *options)
+static int __init gxfb_setup(const char *options)
 {
+	struct option_iter iter;
+	const char *opt;
 
-	char *opt;
+	option_iter_init(&iter, options);
 
-	if (!options || !*options)
-		return 0;
-
-	while ((opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, opt)) {
 		static char mode_option_buf[256];
 		int ret;
 
-		if (!*opt)
-			continue;
-
 		ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", opt);
 		if (WARN(ret < 0, "gxfb: ignoring invalid option, ret=%d\n", ret))
 			continue;
@@ -511,6 +508,8 @@ static int __init gxfb_setup(char *options)
 		mode_option = mode_option_buf;
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif
diff --git a/drivers/video/fbdev/geode/lxfb_core.c b/drivers/video/fbdev/geode/lxfb_core.c
index 6e1e73a21bdb..d687054cdb09 100644
--- a/drivers/video/fbdev/geode/lxfb_core.c
+++ b/drivers/video/fbdev/geode/lxfb_core.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -618,17 +619,14 @@ static struct pci_driver lxfb_driver = {
 };
 
 #ifndef MODULE
-static int __init lxfb_setup(char *options)
+static int __init lxfb_setup(const char *options)
 {
-	char *opt;
+	struct option_iter iter;
+	const char *opt;
 
-	if (!options || !*options)
-		return 0;
-
-	while ((opt = strsep(&options, ",")) != NULL) {
-		if (!*opt)
-			continue;
+	option_iter_init(&iter, options);
 
+	while (option_iter_next(&iter, opt)) {
 		if (!strcmp(opt, "noclear"))
 			noclear = 1;
 		else if (!strcmp(opt, "nopanel"))
-- 
2.39.2