[VIDEO]: Fix OOPS in all SBUS framebuffer drivers.

All of these drivers use a silly:

struct all_info {
	struct fb_info info;
	struct foo_par par;
};

struct all_info *all = kzalloc(sizeof(*all), GFP_KERNEL);
all->info.par = &all->par;

etc. etc. code sequence, basically replicating the provided
framebuffer_alloc()/framebuffer_release(), and doing it badly.

Not only is this massive code duplication, it also caused a
bug in that we weren't setting the fb_info->device pointer
which results in an OOPS when fb_is_primary_device() runs.

Fix all of this by using framebuffer_{alloc,release}() and
passing in "&of_device->dev" as the device pointer.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 53 insertions, 52 deletions

diff --git a/drivers/video/bw2.c b/drivers/video/bw2.c
index b0b2e40bbd9f..718b9f83736e 100644
--- a/drivers/video/bw2.c
+++ b/drivers/video/bw2.c
@@ -279,90 +279,91 @@ static void __devinit bw2_do_default_mode(struct bw2_par *par,
         }
 }
 
-struct all_info {
-        struct fb_info info;
-        struct bw2_par par;
-};
-
-static int __devinit bw2_init_one(struct of_device *op)
+static int __devinit bw2_probe(struct of_device *op, const struct of_device_id *match)
 {
         struct device_node *dp = op->node;
-        struct all_info *all;
+        struct fb_info *info;
+        struct bw2_par *par;
         int linebytes, err;
 
-        all = kzalloc(sizeof(*all), GFP_KERNEL);
-        if (!all)
-                return -ENOMEM;
+        info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
 
-        spin_lock_init(&all->par.lock);
+        err = -ENOMEM;
+        if (!info)
+                goto out_err;
+        par = info->par;
 
-        all->par.physbase = op->resource[0].start;
-        all->par.which_io = op->resource[0].flags & IORESOURCE_BITS;
+        spin_lock_init(&par->lock);
 
-        sbusfb_fill_var(&all->info.var, dp->node, 1);
+        par->physbase = op->resource[0].start;
+        par->which_io = op->resource[0].flags & IORESOURCE_BITS;
+
+        sbusfb_fill_var(&info->var, dp->node, 1);
         linebytes = of_getintprop_default(dp, "linebytes",
-                                          all->info.var.xres);
+                                          info->var.xres);
 
-        all->info.var.red.length = all->info.var.green.length =
-                all->info.var.blue.length = all->info.var.bits_per_pixel;
-        all->info.var.red.offset = all->info.var.green.offset =
-                all->info.var.blue.offset = 0;
+        info->var.red.length = info->var.green.length =
+                info->var.blue.length = info->var.bits_per_pixel;
+        info->var.red.offset = info->var.green.offset =
+                info->var.blue.offset = 0;
 
-        all->par.regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
-                                   sizeof(struct bw2_regs), "bw2 regs");
+        par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
+                               sizeof(struct bw2_regs), "bw2 regs");
+        if (!par->regs)
+                goto out_release_fb;
 
         if (!of_find_property(dp, "width", NULL))
-                bw2_do_default_mode(&all->par, &all->info, &linebytes);
+                bw2_do_default_mode(par, info, &linebytes);
 
-        all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
+        par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
 
-        all->info.flags = FBINFO_DEFAULT;
-        all->info.fbops = &bw2_ops;
+        info->flags = FBINFO_DEFAULT;
+        info->fbops = &bw2_ops;
 
-        all->info.screen_base =
-                of_ioremap(&op->resource[0], 0, all->par.fbsize, "bw2 ram");
-        all->info.par = &all->par;
+        info->screen_base = of_ioremap(&op->resource[0], 0,
+                                       par->fbsize, "bw2 ram");
+        if (!info->screen_base)
+                goto out_unmap_regs;
 
-        bw2_blank(0, &all->info);
+        bw2_blank(0, info);
 
-        bw2_init_fix(&all->info, linebytes);
+        bw2_init_fix(info, linebytes);
 
-        err= register_framebuffer(&all->info);
-        if (err < 0) {
-                of_iounmap(&op->resource[0],
-                           all->par.regs, sizeof(struct bw2_regs));
-                of_iounmap(&op->resource[0],
-                           all->info.screen_base, all->par.fbsize);
-                kfree(all);
-                return err;
-        }
+        err = register_framebuffer(info);
+        if (err < 0)
+                goto out_unmap_screen;
 
-        dev_set_drvdata(&op->dev, all);
+        dev_set_drvdata(&op->dev, info);
 
         printk("%s: bwtwo at %lx:%lx\n",
-               dp->full_name,
-               all->par.which_io, all->par.physbase);
+               dp->full_name, par->which_io, par->physbase);
 
         return 0;
-}
 
-static int __devinit bw2_probe(struct of_device *dev, const struct of_device_id *match)
-{
-        struct of_device *op = to_of_device(&dev->dev);
+out_unmap_screen:
+        of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
+
+out_unmap_regs:
+        of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
+
+out_release_fb:
+        framebuffer_release(info);
 
-        return bw2_init_one(op);
+out_err:
+        return err;
 }
 
 static int __devexit bw2_remove(struct of_device *op)
 {
-        struct all_info *all = dev_get_drvdata(&op->dev);
+        struct fb_info *info = dev_get_drvdata(&op->dev);
+        struct bw2_par *par = info->par;
 
-        unregister_framebuffer(&all->info);
+        unregister_framebuffer(info);
 
-        of_iounmap(&op->resource[0], all->par.regs, sizeof(struct bw2_regs));
-        of_iounmap(&op->resource[0], all->info.screen_base, all->par.fbsize);
+        of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
+        of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
 
-        kfree(all);
+        framebuffer_release(info);
 
         dev_set_drvdata(&op->dev, NULL);