[PATCH 12/99] fbdev/aty: Parse option string with struct option_iter

[Thomas Zimmermann]

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@xxxxxxx>
---
 drivers/video/fbdev/aty/aty128fb.c    | 14 +++++++++-----
 drivers/video/fbdev/aty/atyfb_base.c  | 14 +++++++++-----
 drivers/video/fbdev/aty/radeon_base.c | 17 +++++++++--------
 3 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/drivers/video/fbdev/aty/aty128fb.c b/drivers/video/fbdev/aty/aty128fb.c
index 3c08904a107f..4a200eabe80b 100644
--- a/drivers/video/fbdev/aty/aty128fb.c
+++ b/drivers/video/fbdev/aty/aty128fb.c
@@ -48,6 +48,7 @@
 
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
@@ -1673,14 +1674,14 @@ static int aty128fb_sync(struct fb_info *info)
 }
 
 #ifndef MODULE
-static int aty128fb_setup(char *options)
+static int aty128fb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "lcd:", 4)) {
 			default_lcd_on = simple_strtoul(this_opt+4, NULL, 0);
 			continue;
@@ -1735,6 +1736,9 @@ static int aty128fb_setup(char *options)
 			mode_option = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif  /*  MODULE  */
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 5e6e83472c30..1920ee5c9a2a 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -49,6 +49,7 @@
 ******************************************************************************/
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/compat.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
@@ -3831,14 +3832,14 @@ static struct pci_driver atyfb_driver = {
 #endif /* CONFIG_PCI */
 
 #ifndef MODULE
-static int __init atyfb_setup(char *options)
+static int __init atyfb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "noaccel", 7)) {
 			noaccel = true;
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
@@ -3908,6 +3909,9 @@ static int __init atyfb_setup(char *options)
 			mode = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif  /*  MODULE  */
diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c
index b885a7cc2424..185cd98ad59d 100644
--- a/drivers/video/fbdev/aty/radeon_base.c
+++ b/drivers/video/fbdev/aty/radeon_base.c
@@ -55,6 +55,7 @@
 #include "radeonfb.h"
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
@@ -2561,17 +2562,14 @@ static struct pci_driver radeonfb_driver = {
 };
 
 #ifndef MODULE
-static int __init radeonfb_setup (char *options)
+static int __init radeonfb_setup (const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
-	if (!options || !*options)
-		return 0;
-
-	while ((this_opt = strsep (&options, ",")) != NULL) {
-		if (!*this_opt)
-			continue;
+	option_iter_init(&iter, options);
 
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "noaccel", 7)) {
 			noaccel = 1;
 		} else if (!strncmp(this_opt, "mirror", 6)) {
@@ -2608,6 +2606,9 @@ static int __init radeonfb_setup (char *options)
 			mode_option = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif  /*  MODULE  */
-- 
2.39.2