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video: fbdev: vesafb: add missed release_region 

The driver forgets to free the I/O region in remove and probe
failure.
Add the missed calls to fix it.

Since the success of request_region() is optional, add the "region" field
in vesafb_par to represent whether request_region() succeeds.
Then only call release_region() when "region" is not null.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200329145839.20076-1-hslester96@gmail.com
This commit is contained in:
Chuhong Yuan 2020-03-29 22:58:39 +08:00 committed by Bartlomiej Zolnierkiewicz
parent fbe3d80df8
commit 6937749955
1 changed files with 11 additions and 5 deletions
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16
drivers/video/fbdev/vesafb.c
View File

@ -32,6 +32,7 @@
struct vesafb_par {
u32 pseudo_palette[256];
int wc_cookie;
struct resource *region;
};
static struct fb_var_screeninfo vesafb_defined = {
@ -411,7 +412,7 @@ static int vesafb_probe(struct platform_device *dev)
/* request failure does not faze us, as vgacon probably has this
* region already (FIXME) */
request_region(0x3c0, 32, "vesafb");
par->region = request_region(0x3c0, 32, "vesafb");
if (mtrr == 3) {
unsigned int temp_size = size_total;
@ -439,7 +440,7 @@ static int vesafb_probe(struct platform_device *dev)
"vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
vesafb_fix.smem_len, vesafb_fix.smem_start);
err = -EIO;
goto err;
goto err_release_region;
}
printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
@ -458,19 +459,22 @@ static int vesafb_probe(struct platform_device *dev)
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
err = -ENOMEM;
goto err;
goto err_release_region;
}
if (register_framebuffer(info)<0) {
err = -EINVAL;
fb_dealloc_cmap(&info->cmap);
goto err;
goto err_release_region;
}
fb_info(info, "%s frame buffer device\n", info->fix.id);
return 0;
err:
err_release_region:
arch_phys_wc_del(par->wc_cookie);
if (info->screen_base)
iounmap(info->screen_base);
if (par->region)
release_region(0x3c0, 32);
err:
framebuffer_release(info);
release_mem_region(vesafb_fix.smem_start, size_total);
return err;
@ -481,6 +485,8 @@ static int vesafb_remove(struct platform_device *pdev)
struct fb_info *info = platform_get_drvdata(pdev);
unregister_framebuffer(info);
if (((struct vesafb_par *)(info->par))->region)
release_region(0x3c0, 32);
framebuffer_release(info);
return 0;