From:   Thomas Zimmermann <tzimmermann@suse.de>
To:     deller@gmx.de, paulus@samba.org, benh@kernel.crashing.org,
        linux@armlinux.org.uk, pjones@redhat.com, timur@kernel.org,
        adaplas@gmail.com, s.hauer@pengutronix.de, shawnguo@kernel.org,
        mbroemme@libmpq.org, thomas@winischhofer.net,
        James.Bottomley@HansenPartnership.com, spock@gentoo.org,
        sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com,
        geert+renesas@glider.be, corbet@lwn.net
Cc:     linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org,
        Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH 51/99] fbdev/nvidiafb: Parse option string with struct option_iter
Date:   Mon,  6 Mar 2023 16:59:28 +0100
Message-Id: <20230306160016.4459-52-tzimmermann@suse.de>
In-Reply-To: <20230306160016.4459-1-tzimmermann@suse.de>
References: <20230306160016.4459-1-tzimmermann@suse.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@suse.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