On Wednesday, July 05, 2017 03:02:47 PM Dan Carpenter wrote:
> On Tue, Jul 04, 2017 at 05:44:57PM +0200, Bartlomiej Zolnierkiewicz wrote:
> >
> > Hi,
> >
> > On Friday, June 30, 2017 11:02:42 AM Dan Carpenter wrote:
> > > We free "info" then dereference it on the next line. I've moved the
> > > call to framebuffer_release() down a line to avoid this problem.
> > >
> > > Fixes: b7d2d37276c1 ("video: imxfb: Remove unused fields from platform data structure")
> > > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > >
> > > diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c
> > > index c166e0725be5..1d0c3592b290 100644
> > > --- a/drivers/video/fbdev/imxfb.c
> > > +++ b/drivers/video/fbdev/imxfb.c
> > > @@ -1080,10 +1080,9 @@ static int imxfb_remove(struct platform_device *pdev)
> > >
> > > fb_dealloc_cmap(&info->cmap);
> > > kfree(info->pseudo_palette);
> > > - framebuffer_release(info);
> > > -
> > > dma_free_wc(&pdev->dev, fbi->map_size, info->screen_base,
> > > fbi->map_dma);
> > > + framebuffer_release(info);
> > >
> > > iounmap(fbi->regs);
> >
> > Good catch.
> >
> > While you are at it, please:
> >
> > - move framebuffer_release() after iounmap() (memory occupied by
> > fbi will also be freed by framebuffer_release() call, please see
> > framebuffer_alloc() for details)
> >
>
> I'm still recovering from an illness so I might not be thinking
> straight. I don't see a bug here. But I agree that it should mirror
Please take a look at the imxfb_probe():
...
struct imxfb_info *fbi;
...
info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
if (!info)
return -ENOMEM;
fbi = info->par;
...
and framebuffer_alloc():
struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
...
int fb_info_size = sizeof(struct fb_info);
...
p = kzalloc(fb_info_size + size, GFP_KERNEL);
if (!p)
return NULL;
info = (struct fb_info *) p;
if (size)
info->par = p + fb_info_size;
...
> the probe function so I'll re-write the patch.
Great!
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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