linux-kernel - [PATCH v2 088/101] fbdev/uvesafb: Parse option string with struct option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230309160201.5163-89-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:48 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, geert+renesas@...der.be, timur@...nel.org,
        rdunlap@...radead.org, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, adaplas@...il.com,
        s.hauer@...gutronix.de, shawnguo@...nel.org, mbroemme@...mpq.org,
        thomas@...ischhofer.net, James.Bottomley@...senPartnership.com,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        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 v2 088/101] fbdev/uvesafb: 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/uvesafb.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/uvesafb.c b/drivers/video/fbdev/uvesafb.c
index ff8f511a00c2..13bd8503a06b 100644
--- a/drivers/video/fbdev/uvesafb.c
+++ b/drivers/video/fbdev/uvesafb.c
@@ -9,6 +9,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/cmdline.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
@@ -1809,16 +1810,14 @@ static struct platform_driver uvesafb_driver = {
 static struct platform_device *uvesafb_device;
 
 #ifndef MODULE
-static int uvesafb_setup(char *options)
+static int uvesafb_setup(const char *options)
 {
+	struct option_iter iter;
 	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 (!strcmp(this_opt, "redraw"))
 			ypan = 0;
 		else if (!strcmp(this_opt, "ypan"))
@@ -1860,6 +1859,8 @@ static int uvesafb_setup(char *options)
 		}
 	}
 
+	option_iter_release(&iter);
+
 	if (mtrr != 3 && mtrr != 0)
 		pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
 
-- 
2.39.2