From:   Thomas Zimmermann <tzimmermann@suse.de>
To:     deller@gmx.de, geert+renesas@glider.be, timur@kernel.org,
        rdunlap@infradead.org, paulus@samba.org, benh@kernel.crashing.org,
        linux@armlinux.org.uk, pjones@redhat.com, adaplas@gmail.com,
        s.hauer@pengutronix.de, shawnguo@kernel.org, mbroemme@libmpq.org,
        thomas@winischhofer.net, James.Bottomley@HansenPartnership.com,
        sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com,
        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 v2 009/101] fbdev/atafb: Duplicate video-mode option string
Date:   Thu,  9 Mar 2023 17:00:29 +0100
Message-Id: <20230309160201.5163-10-tzimmermann@suse.de>
In-Reply-To: <20230309160201.5163-1-tzimmermann@suse.de>
References: <20230309160201.5163-1-tzimmermann@suse.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Assume that the driver does not own the option string or its substrings
and hence duplicate the option string for the video mode. Allocate the
copy's memory with devm_kstrdup(), as the driver parses the option string
once per probed device. Linux will automatically free the memory upon
releasing the device.

Done in preparation of switching the driver to struct option_iter and
constifying the option string.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/video/fbdev/atafb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/video/fbdev/atafb.c b/drivers/video/fbdev/atafb.c
index 2bc4089865e6..f0cc7c992c88 100644
--- a/drivers/video/fbdev/atafb.c
+++ b/drivers/video/fbdev/atafb.c
@@ -2934,7 +2934,7 @@ static void __init atafb_setup_user(char *spec)
 	}
 }
 
-static int __init atafb_setup(char *options)
+static int __init atafb_setup(char *options, struct platform_device *pdev)
 {
 	char *this_opt;
 	int temp;
@@ -2946,8 +2946,9 @@ static int __init atafb_setup(char *options)
 		if (!*this_opt)
 			continue;
 		if ((temp = get_video_mode(this_opt))) {
+			// ignore errors
+			mode_option = devm_kstrdup(&pdev->dev, this_opt, GFP_KERNEL);
 			default_par = temp;
-			mode_option = this_opt;
 		} else if (!strcmp(this_opt, "inverse"))
 			fb_invert_cmaps();
 		else if (!strncmp(this_opt, "hwscroll_", 9)) {
@@ -2992,7 +2993,7 @@ static int __init atafb_probe(struct platform_device *pdev)
 
 	if (fb_get_options("atafb", &option))
 		return -ENODEV;
-	atafb_setup(option);
+	atafb_setup(option, pdev);
 	dev_dbg(&pdev->dev, "%s: start\n", __func__);
 
 	do {
-- 
2.39.2