linux-kernel - [PATCH 25/99] fbdev/gbefb: Parse option string with struct option

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Date:   Mon,  6 Mar 2023 16:59:02 +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 25/99] fbdev/gbefb: 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/gbefb.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c
index 5330aa6029ca..36651bb6006d 100644
--- a/drivers/video/fbdev/gbefb.c
+++ b/drivers/video/fbdev/gbefb.c
@@ -9,6 +9,7 @@
  *  more details.
  */
 
+#include <linux/cmdline.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
@@ -1083,14 +1084,14 @@ ATTRIBUTE_GROUPS(gbefb);
  * Initialization
  */
 
-static int gbefb_setup(char *options, struct device *dev)
+static int gbefb_setup(const char *options, struct device *dev)
 {
-	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, "monitor:", 8)) {
 			if (!strncmp(this_opt + 8, "crt", 3)) {
 				flat_panel_enabled = 0;
@@ -1103,7 +1104,7 @@ static int gbefb_setup(char *options, struct device *dev)
 				default_mode = &default_mode_LCD;
 			}
 		} else if (!strncmp(this_opt, "mem:", 4)) {
-			gbe_mem_size = memparse(this_opt + 4, &this_opt);
+			gbe_mem_size = memparse(this_opt + 4, NULL);
 			if (gbe_mem_size > CONFIG_FB_GBE_MEM * 1024 * 1024)
 				gbe_mem_size = CONFIG_FB_GBE_MEM * 1024 * 1024;
 			if (gbe_mem_size < TILE_SIZE)
@@ -1112,6 +1113,9 @@ static int gbefb_setup(char *options, struct device *dev)
 			mode_option = devm_kstrdup(dev, this_opt, GFP_KERNEL);
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2