linux-kernel - [PATCHv3 02/10] fbdev: ssd1307fb: Use vmalloc to allocate video memory.

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Date:	Mon,  9 Mar 2015 23:22:04 +0100
From:	Thomas Niederprüm <niederp@...sik.uni-kl.de>
To:	plagnioj@...osoft.com, tomi.valkeinen@...com,
	maxime.ripard@...e-electrons.com, kernel@...gutronix.de,
	shawn.guo@...aro.org, robh+dt@...nel.org
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Niederprüm <niederp@...sik.uni-kl.de>
Subject: [PATCHv3 02/10] fbdev: ssd1307fb: Use vmalloc to allocate video memory.

It makes sense to use vmalloc to allocate the video buffer since it has to be
page aligned memory for using it with mmap. Also deffered io seems buggy in
combination with kmalloc'ed memory (crash on unloading the module).

Signed-off-by: Thomas Niederprüm <niederp@...sik.uni-kl.de>
---
 drivers/video/fbdev/ssd1307fb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index 61e0ce8..310474a 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -11,6 +11,7 @@
 #include <linux/i2c.h>
 #include <linux/fb.h>
 #include <linux/uaccess.h>
+#include <linux/vmalloc.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pwm.h>
@@ -489,7 +490,7 @@ static int ssd1307fb_probe(struct i2c_client *client,
 
 	vmem_size = par->width * par->height / 8;
 
-	vmem = devm_kzalloc(&client->dev, vmem_size, GFP_KERNEL);
+	vmem = vzalloc(vmem_size);
 	if (!vmem) {
 		dev_err(&client->dev, "Couldn't allocate graphical memory.\n");
 		ret = -ENOMEM;
@@ -559,6 +560,7 @@ panel_init_error:
 		par->ops->remove(par);
 reset_oled_error:
 	fb_deferred_io_cleanup(info);
+	vfree(vmem);
 fb_alloc_error:
 	framebuffer_release(info);
 	return ret;
@@ -573,6 +575,7 @@ static int ssd1307fb_remove(struct i2c_client *client)
 	if (par->ops->remove)
 		par->ops->remove(par);
 	fb_deferred_io_cleanup(info);
+	vfree(__va(info->fix.smem_start));
 	framebuffer_release(info);
 
 	return 0;
-- 
2.3.0

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