linux-kernel - [PATCH 24/99] fbdev/gbefb: Duplicate video-mode option string

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Date:   Mon,  6 Mar 2023 16:59:01 +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 24/99] fbdev/gbefb: 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/gbefb.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c
index 000b4aa44241..5330aa6029ca 100644
--- a/drivers/video/fbdev/gbefb.c
+++ b/drivers/video/fbdev/gbefb.c
@@ -1083,7 +1083,7 @@ ATTRIBUTE_GROUPS(gbefb);
  * Initialization
  */
 
-static int gbefb_setup(char *options)
+static int gbefb_setup(char *options, struct device *dev)
 {
 	char *this_opt;
 
@@ -1108,8 +1108,9 @@ static int gbefb_setup(char *options)
 				gbe_mem_size = CONFIG_FB_GBE_MEM * 1024 * 1024;
 			if (gbe_mem_size < TILE_SIZE)
 				gbe_mem_size = TILE_SIZE;
-		} else
-			mode_option = this_opt;
+		} else {
+			mode_option = devm_kstrdup(dev, this_opt, GFP_KERNEL);
+		}
 	}
 	return 0;
 }
@@ -1132,7 +1133,7 @@ static int gbefb_probe(struct platform_device *p_dev)
 		ret = -ENODEV;
 		goto out_release_framebuffer;
 	}
-	gbefb_setup(options);
+	gbefb_setup(options, &p_dev->dev);
 #endif
 
 	if (!request_mem_region(GBE_BASE, sizeof(struct sgi_gbe), "GBE")) {
-- 
2.39.2