[PATCH 36/99] fbdev/imsttfb: Parse option string with struct option_iter

From: Thomas Zimmermann
Date: Mon Mar 06 2023 - 11:02:57 EST


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/imsttfb.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/imsttfb.c b/drivers/video/fbdev/imsttfb.c
index bea45647184e..fc046886599c 100644
--- a/drivers/video/fbdev/imsttfb.c
+++ b/drivers/video/fbdev/imsttfb.c
@@ -17,6 +17,7 @@
*/

#include <linux/aperture.h>
+#include <linux/cmdline.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
@@ -1560,16 +1561,16 @@ static void imsttfb_remove(struct pci_dev *pdev)

#ifndef MODULE
static int __init
-imsttfb_setup(char *options)
+imsttfb_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, "font:", 5)) {
- char *p;
+ const char *p;
int i;

p = this_opt + 5;
@@ -1608,6 +1609,9 @@ imsttfb_setup(char *options)
}
#endif
}
+
+ option_iter_release(&iter);
+
return 0;
}

--
2.39.2