linux-kernel - [PATCH v2 006/101] fbdev/amifb: Duplicate video-mode option string

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Date:   Thu,  9 Mar 2023 17:00:26 +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 006/101] fbdev/amifb: Duplicate video-mode option string

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@...e.de>
---
 drivers/video/fbdev/amifb.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/video/fbdev/amifb.c b/drivers/video/fbdev/amifb.c
index d88265dbebf4..9517aa5bd2c0 100644
--- a/drivers/video/fbdev/amifb.c
+++ b/drivers/video/fbdev/amifb.c
@@ -2345,7 +2345,7 @@ static void __init amifb_setup_mcap(char *spec)
 	amifb_vfmax = vmax;
 }
 
-static int __init amifb_setup(char *options)
+static int __init amifb_setup(char *options, struct platform_device *pdev)
 {
 	char *this_opt;
 
@@ -2363,8 +2363,10 @@ static int __init amifb_setup(char *options)
 			amifb_setup_mcap(this_opt + 11);
 		else if (!strncmp(this_opt, "fstart:", 7))
 			min_fstrt = simple_strtoul(this_opt + 7, NULL, 0);
-		else
-			mode_option = this_opt;
+		else {
+			// ignore errors
+			mode_option = devm_kstrdup(&pdev->dev, this_opt, GFP_KERNEL);
+		}
 	}
 
 	if (min_fstrt < 48)
@@ -3542,7 +3544,7 @@ static int __init amifb_probe(struct platform_device *pdev)
 		amifb_video_off();
 		return -ENODEV;
 	}
-	amifb_setup(option);
+	amifb_setup(option, pdev);
 #endif
 	custom.dmacon = DMAF_ALL | DMAF_MASTER;
 
-- 
2.39.2