linux-kernel - [PATCH 51/99] fbdev/nvidiafb: Parse option string with struct option

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Message-Id: <20230306160016.4459-52-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:59:28 +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 51/99] fbdev/nvidiafb: 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/nvidia/nvidia.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/nvidia/nvidia.c b/drivers/video/fbdev/nvidia/nvidia.c
index eb91201babd4..58b1b13f09dd 100644
--- a/drivers/video/fbdev/nvidia/nvidia.c
+++ b/drivers/video/fbdev/nvidia/nvidia.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1458,17 +1459,18 @@ static void nvidiafb_remove(struct pci_dev *pd)
  * ------------------------------------------------------------------------- */
 
 #ifndef MODULE
-static int nvidiafb_setup(char *options)
+static int nvidiafb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
 	NVTRACE_ENTER();
-	if (!options || !*options)
-		return 0;
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "forceCRTC", 9)) {
-			char *p;
+			const char *p;
 
 			p = this_opt + 9;
 			if (!*p || !*(++p))
@@ -1510,6 +1512,9 @@ static int nvidiafb_setup(char *options)
 			mode_option = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	NVTRACE_LEAVE();
 	return 0;
 }
-- 
2.39.2