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fbdev: fbmem: implement error handling in fbmem_init()

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fbmem_init() ignores all errors, while fbmem_exit() does not
check if deallocating resources are valid.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Alexey Khoroshilov 2016-05-03 05:22:27 +03:00 committed by Tomi Valkeinen
parent 18b6562c24
commit 524edf3877
1 changed files with 17 additions and 3 deletions
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20
drivers/video/fbdev/core/fbmem.c
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@ -1854,17 +1854,31 @@ EXPORT_SYMBOL(fb_set_suspend);
static int __init static int __init
fbmem_init(void) fbmem_init(void)
{ {
proc_create("fb", 0, NULL, &fb_proc_fops); int ret;
if (register_chrdev(FB_MAJOR,"fb",&fb_fops)) if (!proc_create("fb", 0, NULL, &fb_proc_fops))
return -ENOMEM;
ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
if (ret) {
printk("unable to get major %d for fb devs\n", FB_MAJOR); printk("unable to get major %d for fb devs\n", FB_MAJOR);
goto err_chrdev;
}
fb_class = class_create(THIS_MODULE, "graphics"); fb_class = class_create(THIS_MODULE, "graphics");
if (IS_ERR(fb_class)) { if (IS_ERR(fb_class)) {
printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class)); ret = PTR_ERR(fb_class);
pr_warn("Unable to create fb class; errno = %d\n", ret);
fb_class = NULL; fb_class = NULL;
goto err_class;
} }
return 0; return 0;
err_class:
unregister_chrdev(FB_MAJOR, "fb");
err_chrdev:
remove_proc_entry("fb", NULL);
return ret;
} }
#ifdef MODULE #ifdef MODULE