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SubjectRe: [PATCHv2 02/10] fbdev: ssd1307fb: Use vmalloc to allocate video memory.
Am Tue, 3 Mar 2015 09:52:55 +0100
schrieb Maxime Ripard <maxime.ripard@free-electrons.com>:

> Hi,
>
> On Sun, Mar 01, 2015 at 11:27:55PM +0100, Thomas Niederprüm wrote:
> > 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@physik.uni-kl.de>
> > ---
> > drivers/video/fbdev/ssd1307fb.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/video/fbdev/ssd1307fb.c
> > b/drivers/video/fbdev/ssd1307fb.c index 61e0ce8..25dd08d 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;
>
> Don't you need the vfree in the remove too?

Yes, of course. Memory will be freed in v3

>
> Maxime
>



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